requirebin sketch

index.js

// Welcome! require() some modules from npm (like you were using browserify)
// and then hit Run Code to run your code on the right side.
// Modules get downloaded from browserify-cdn and bundled in your browser.

let {addIndex, chain, curry, map, range} = require("ramda")
let snabbdom = require("snabbdom")
let h = require("snabbdom/h")
let hh = require("hyperscript-helpers")

let {div, span} = hh(h)

let patch = snabbdom.init([
  require("snabbdom/modules/style"),
  require("snabbdom/modules/attributes"),
  require("snabbdom/modules/props"),
])

let mapi = addIndex(map)
let chaini = addIndex(chain)

let board1 = [
  [["A1", 0], ["B1", 0]],
  [["C1", 0], ["D1", 0]],
]

let board2 = [
  [["A2", 1], ["B2", 0]],
  [["C2", 0], ["D2", 0]],
]

// renderCell :: Cell -> String
let renderCell = curry((i, j, cell) => {
  if (cell[1] == 0) {
    return span(".cell", [ // <-------- updates when child updates WTF???
      span({attrs: {"class": "card", "data-state": 0}}, [cell[0]])
    ])
  } else {
    return span(".cell", [
      span(".card", {attrs: {"data-state": 1}}, [cell[0]])
    ])
  }
})

// renderBoard :: [[Cell]] -> String
let renderBoard = (board) => {
  let rowsM = board.length
  let colsN = board[0] ? board[0].length : 0
  return div(".board",
    chaini((r, i) => mapi((c, j) => renderCell(i, j, c), r), board)
  )
}

let vnode = renderBoard(board1)

let container = document.getElementById("app")

patch(container, vnode)

document.getElementById("button").addEventListener("click", () => {
  let vnode2 = renderBoard(board2)
  patch(vnode, vnode2)
  vnode = vnode2
})

minified.js

setTimeout(function(){
;require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({"ramda":[function(require,module,exports){
//  Ramda v0.22.1
//  https://github.com/ramda/ramda
//  (c) 2013-2016 Scott Sauyet, Michael Hurley, and David Chambers
//  Ramda may be freely distributed under the MIT license.

;(function() {

  'use strict';

  /**
     * A special placeholder value used to specify "gaps" within curried functions,
     * allowing partial application of any combination of arguments, regardless of
     * their positions.
     *
     * If `g` is a curried ternary function and `_` is `R.__`, the following are
     * equivalent:
     *
     *   - `g(1, 2, 3)`
     *   - `g(_, 2, 3)(1)`
     *   - `g(_, _, 3)(1)(2)`
     *   - `g(_, _, 3)(1, 2)`
     *   - `g(_, 2, _)(1, 3)`
     *   - `g(_, 2)(1)(3)`
     *   - `g(_, 2)(1, 3)`
     *   - `g(_, 2)(_, 3)(1)`
     *
     * @constant
     * @memberOf R
     * @since v0.6.0
     * @category Function
     * @example
     *
     *      var greet = R.replace('{name}', R.__, 'Hello, {name}!');
     *      greet('Alice'); //=> 'Hello, Alice!'
     */
    var __ = { '@@functional/placeholder': true };

    /* eslint-disable no-unused-vars */
    var _arity = function _arity(n, fn) {
        /* eslint-disable no-unused-vars */
        switch (n) {
        case 0:
            return function () {
                return fn.apply(this, arguments);
            };
        case 1:
            return function (a0) {
                return fn.apply(this, arguments);
            };
        case 2:
            return function (a0, a1) {
                return fn.apply(this, arguments);
            };
        case 3:
            return function (a0, a1, a2) {
                return fn.apply(this, arguments);
            };
        case 4:
            return function (a0, a1, a2, a3) {
                return fn.apply(this, arguments);
            };
        case 5:
            return function (a0, a1, a2, a3, a4) {
                return fn.apply(this, arguments);
            };
        case 6:
            return function (a0, a1, a2, a3, a4, a5) {
                return fn.apply(this, arguments);
            };
        case 7:
            return function (a0, a1, a2, a3, a4, a5, a6) {
                return fn.apply(this, arguments);
            };
        case 8:
            return function (a0, a1, a2, a3, a4, a5, a6, a7) {
                return fn.apply(this, arguments);
            };
        case 9:
            return function (a0, a1, a2, a3, a4, a5, a6, a7, a8) {
                return fn.apply(this, arguments);
            };
        case 10:
            return function (a0, a1, a2, a3, a4, a5, a6, a7, a8, a9) {
                return fn.apply(this, arguments);
            };
        default:
            throw new Error('First argument to _arity must be a non-negative integer no greater than ten');
        }
    };

    var _arrayFromIterator = function _arrayFromIterator(iter) {
        var list = [];
        var next;
        while (!(next = iter.next()).done) {
            list.push(next.value);
        }
        return list;
    };

    var _arrayOf = function _arrayOf() {
        return Array.prototype.slice.call(arguments);
    };

    var _cloneRegExp = function _cloneRegExp(pattern) {
        return new RegExp(pattern.source, (pattern.global ? 'g' : '') + (pattern.ignoreCase ? 'i' : '') + (pattern.multiline ? 'm' : '') + (pattern.sticky ? 'y' : '') + (pattern.unicode ? 'u' : ''));
    };

    var _complement = function _complement(f) {
        return function () {
            return !f.apply(this, arguments);
        };
    };

    /**
     * Private `concat` function to merge two array-like objects.
     *
     * @private
     * @param {Array|Arguments} [set1=[]] An array-like object.
     * @param {Array|Arguments} [set2=[]] An array-like object.
     * @return {Array} A new, merged array.
     * @example
     *
     *      _concat([4, 5, 6], [1, 2, 3]); //=> [4, 5, 6, 1, 2, 3]
     */
    var _concat = function _concat(set1, set2) {
        set1 = set1 || [];
        set2 = set2 || [];
        var idx;
        var len1 = set1.length;
        var len2 = set2.length;
        var result = [];
        idx = 0;
        while (idx < len1) {
            result[result.length] = set1[idx];
            idx += 1;
        }
        idx = 0;
        while (idx < len2) {
            result[result.length] = set2[idx];
            idx += 1;
        }
        return result;
    };

    var _containsWith = function _containsWith(pred, x, list) {
        var idx = 0;
        var len = list.length;
        while (idx < len) {
            if (pred(x, list[idx])) {
                return true;
            }
            idx += 1;
        }
        return false;
    };

    var _filter = function _filter(fn, list) {
        var idx = 0;
        var len = list.length;
        var result = [];
        while (idx < len) {
            if (fn(list[idx])) {
                result[result.length] = list[idx];
            }
            idx += 1;
        }
        return result;
    };

    var _forceReduced = function _forceReduced(x) {
        return {
            '@@transducer/value': x,
            '@@transducer/reduced': true
        };
    };

    // String(x => x) evaluates to "x => x", so the pattern may not match.
    var _functionName = function _functionName(f) {
        // String(x => x) evaluates to "x => x", so the pattern may not match.
        var match = String(f).match(/^function (\w*)/);
        return match == null ? '' : match[1];
    };

    var _has = function _has(prop, obj) {
        return Object.prototype.hasOwnProperty.call(obj, prop);
    };

    var _identity = function _identity(x) {
        return x;
    };

    var _isArguments = function () {
        var toString = Object.prototype.toString;
        return toString.call(arguments) === '[object Arguments]' ? function _isArguments(x) {
            return toString.call(x) === '[object Arguments]';
        } : function _isArguments(x) {
            return _has('callee', x);
        };
    }();

    /**
     * Tests whether or not an object is an array.
     *
     * @private
     * @param {*} val The object to test.
     * @return {Boolean} `true` if `val` is an array, `false` otherwise.
     * @example
     *
     *      _isArray([]); //=> true
     *      _isArray(null); //=> false
     *      _isArray({}); //=> false
     */
    var _isArray = Array.isArray || function _isArray(val) {
        return val != null && val.length >= 0 && Object.prototype.toString.call(val) === '[object Array]';
    };

    var _isFunction = function _isFunction(x) {
        return Object.prototype.toString.call(x) === '[object Function]';
    };

    /**
     * Determine if the passed argument is an integer.
     *
     * @private
     * @param {*} n
     * @category Type
     * @return {Boolean}
     */
    var _isInteger = Number.isInteger || function _isInteger(n) {
        return n << 0 === n;
    };

    var _isNumber = function _isNumber(x) {
        return Object.prototype.toString.call(x) === '[object Number]';
    };

    var _isObject = function _isObject(x) {
        return Object.prototype.toString.call(x) === '[object Object]';
    };

    var _isPlaceholder = function _isPlaceholder(a) {
        return a != null && typeof a === 'object' && a['@@functional/placeholder'] === true;
    };

    var _isRegExp = function _isRegExp(x) {
        return Object.prototype.toString.call(x) === '[object RegExp]';
    };

    var _isString = function _isString(x) {
        return Object.prototype.toString.call(x) === '[object String]';
    };

    var _isTransformer = function _isTransformer(obj) {
        return typeof obj['@@transducer/step'] === 'function';
    };

    var _map = function _map(fn, functor) {
        var idx = 0;
        var len = functor.length;
        var result = Array(len);
        while (idx < len) {
            result[idx] = fn(functor[idx]);
            idx += 1;
        }
        return result;
    };

    // Based on https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/assign
    var _objectAssign = function _objectAssign(target) {
        if (target == null) {
            throw new TypeError('Cannot convert undefined or null to object');
        }
        var output = Object(target);
        var idx = 1;
        var length = arguments.length;
        while (idx < length) {
            var source = arguments[idx];
            if (source != null) {
                for (var nextKey in source) {
                    if (_has(nextKey, source)) {
                        output[nextKey] = source[nextKey];
                    }
                }
            }
            idx += 1;
        }
        return output;
    };

    var _of = function _of(x) {
        return [x];
    };

    var _pipe = function _pipe(f, g) {
        return function () {
            return g.call(this, f.apply(this, arguments));
        };
    };

    var _pipeP = function _pipeP(f, g) {
        return function () {
            var ctx = this;
            return f.apply(ctx, arguments).then(function (x) {
                return g.call(ctx, x);
            });
        };
    };

    // \b matches word boundary; [\b] matches backspace
    var _quote = function _quote(s) {
        var escaped = s.replace(/\\/g, '\\\\').replace(/[\b]/g, '\\b')    // \b matches word boundary; [\b] matches backspace
    .replace(/\f/g, '\\f').replace(/\n/g, '\\n').replace(/\r/g, '\\r').replace(/\t/g, '\\t').replace(/\v/g, '\\v').replace(/\0/g, '\\0');
        return '"' + escaped.replace(/"/g, '\\"') + '"';
    };

    var _reduced = function _reduced(x) {
        return x && x['@@transducer/reduced'] ? x : {
            '@@transducer/value': x,
            '@@transducer/reduced': true
        };
    };

    /**
     * An optimized, private array `slice` implementation.
     *
     * @private
     * @param {Arguments|Array} args The array or arguments object to consider.
     * @param {Number} [from=0] The array index to slice from, inclusive.
     * @param {Number} [to=args.length] The array index to slice to, exclusive.
     * @return {Array} A new, sliced array.
     * @example
     *
     *      _slice([1, 2, 3, 4, 5], 1, 3); //=> [2, 3]
     *
     *      var firstThreeArgs = function(a, b, c, d) {
     *        return _slice(arguments, 0, 3);
     *      };
     *      firstThreeArgs(1, 2, 3, 4); //=> [1, 2, 3]
     */
    var _slice = function _slice(args, from, to) {
        switch (arguments.length) {
        case 1:
            return _slice(args, 0, args.length);
        case 2:
            return _slice(args, from, args.length);
        default:
            var list = [];
            var idx = 0;
            var len = Math.max(0, Math.min(args.length, to) - from);
            while (idx < len) {
                list[idx] = args[from + idx];
                idx += 1;
            }
            return list;
        }
    };

    /**
     * Polyfill from <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString>.
     */
    var _toISOString = function () {
        var pad = function pad(n) {
            return (n < 10 ? '0' : '') + n;
        };
        return typeof Date.prototype.toISOString === 'function' ? function _toISOString(d) {
            return d.toISOString();
        } : function _toISOString(d) {
            return d.getUTCFullYear() + '-' + pad(d.getUTCMonth() + 1) + '-' + pad(d.getUTCDate()) + 'T' + pad(d.getUTCHours()) + ':' + pad(d.getUTCMinutes()) + ':' + pad(d.getUTCSeconds()) + '.' + (d.getUTCMilliseconds() / 1000).toFixed(3).slice(2, 5) + 'Z';
        };
    }();

    var _xfBase = {
        init: function () {
            return this.xf['@@transducer/init']();
        },
        result: function (result) {
            return this.xf['@@transducer/result'](result);
        }
    };

    var _xwrap = function () {
        function XWrap(fn) {
            this.f = fn;
        }
        XWrap.prototype['@@transducer/init'] = function () {
            throw new Error('init not implemented on XWrap');
        };
        XWrap.prototype['@@transducer/result'] = function (acc) {
            return acc;
        };
        XWrap.prototype['@@transducer/step'] = function (acc, x) {
            return this.f(acc, x);
        };
        return function _xwrap(fn) {
            return new XWrap(fn);
        };
    }();

    var _aperture = function _aperture(n, list) {
        var idx = 0;
        var limit = list.length - (n - 1);
        var acc = new Array(limit >= 0 ? limit : 0);
        while (idx < limit) {
            acc[idx] = _slice(list, idx, idx + n);
            idx += 1;
        }
        return acc;
    };

    var _assign = typeof Object.assign === 'function' ? Object.assign : _objectAssign;

    /**
     * Similar to hasMethod, this checks whether a function has a [methodname]
     * function. If it isn't an array it will execute that function otherwise it
     * will default to the ramda implementation.
     *
     * @private
     * @param {Function} fn ramda implemtation
     * @param {String} methodname property to check for a custom implementation
     * @return {Object} Whatever the return value of the method is.
     */
    var _checkForMethod = function _checkForMethod(methodname, fn) {
        return function () {
            var length = arguments.length;
            if (length === 0) {
                return fn();
            }
            var obj = arguments[length - 1];
            return _isArray(obj) || typeof obj[methodname] !== 'function' ? fn.apply(this, arguments) : obj[methodname].apply(obj, _slice(arguments, 0, length - 1));
        };
    };

    /**
     * Optimized internal one-arity curry function.
     *
     * @private
     * @category Function
     * @param {Function} fn The function to curry.
     * @return {Function} The curried function.
     */
    var _curry1 = function _curry1(fn) {
        return function f1(a) {
            if (arguments.length === 0 || _isPlaceholder(a)) {
                return f1;
            } else {
                return fn.apply(this, arguments);
            }
        };
    };

    /**
     * Optimized internal two-arity curry function.
     *
     * @private
     * @category Function
     * @param {Function} fn The function to curry.
     * @return {Function} The curried function.
     */
    var _curry2 = function _curry2(fn) {
        return function f2(a, b) {
            switch (arguments.length) {
            case 0:
                return f2;
            case 1:
                return _isPlaceholder(a) ? f2 : _curry1(function (_b) {
                    return fn(a, _b);
                });
            default:
                return _isPlaceholder(a) && _isPlaceholder(b) ? f2 : _isPlaceholder(a) ? _curry1(function (_a) {
                    return fn(_a, b);
                }) : _isPlaceholder(b) ? _curry1(function (_b) {
                    return fn(a, _b);
                }) : fn(a, b);
            }
        };
    };

    /**
     * Optimized internal three-arity curry function.
     *
     * @private
     * @category Function
     * @param {Function} fn The function to curry.
     * @return {Function} The curried function.
     */
    var _curry3 = function _curry3(fn) {
        return function f3(a, b, c) {
            switch (arguments.length) {
            case 0:
                return f3;
            case 1:
                return _isPlaceholder(a) ? f3 : _curry2(function (_b, _c) {
                    return fn(a, _b, _c);
                });
            case 2:
                return _isPlaceholder(a) && _isPlaceholder(b) ? f3 : _isPlaceholder(a) ? _curry2(function (_a, _c) {
                    return fn(_a, b, _c);
                }) : _isPlaceholder(b) ? _curry2(function (_b, _c) {
                    return fn(a, _b, _c);
                }) : _curry1(function (_c) {
                    return fn(a, b, _c);
                });
            default:
                return _isPlaceholder(a) && _isPlaceholder(b) && _isPlaceholder(c) ? f3 : _isPlaceholder(a) && _isPlaceholder(b) ? _curry2(function (_a, _b) {
                    return fn(_a, _b, c);
                }) : _isPlaceholder(a) && _isPlaceholder(c) ? _curry2(function (_a, _c) {
                    return fn(_a, b, _c);
                }) : _isPlaceholder(b) && _isPlaceholder(c) ? _curry2(function (_b, _c) {
                    return fn(a, _b, _c);
                }) : _isPlaceholder(a) ? _curry1(function (_a) {
                    return fn(_a, b, c);
                }) : _isPlaceholder(b) ? _curry1(function (_b) {
                    return fn(a, _b, c);
                }) : _isPlaceholder(c) ? _curry1(function (_c) {
                    return fn(a, b, _c);
                }) : fn(a, b, c);
            }
        };
    };

    /**
     * Internal curryN function.
     *
     * @private
     * @category Function
     * @param {Number} length The arity of the curried function.
     * @param {Array} received An array of arguments received thus far.
     * @param {Function} fn The function to curry.
     * @return {Function} The curried function.
     */
    var _curryN = function _curryN(length, received, fn) {
        return function () {
            var combined = [];
            var argsIdx = 0;
            var left = length;
            var combinedIdx = 0;
            while (combinedIdx < received.length || argsIdx < arguments.length) {
                var result;
                if (combinedIdx < received.length && (!_isPlaceholder(received[combinedIdx]) || argsIdx >= arguments.length)) {
                    result = received[combinedIdx];
                } else {
                    result = arguments[argsIdx];
                    argsIdx += 1;
                }
                combined[combinedIdx] = result;
                if (!_isPlaceholder(result)) {
                    left -= 1;
                }
                combinedIdx += 1;
            }
            return left <= 0 ? fn.apply(this, combined) : _arity(left, _curryN(length, combined, fn));
        };
    };

    /**
     * Returns a function that dispatches with different strategies based on the
     * object in list position (last argument). If it is an array, executes [fn].
     * Otherwise, if it has a function with [methodname], it will execute that
     * function (functor case). Otherwise, if it is a transformer, uses transducer
     * [xf] to return a new transformer (transducer case). Otherwise, it will
     * default to executing [fn].
     *
     * @private
     * @param {String} methodname property to check for a custom implementation
     * @param {Function} xf transducer to initialize if object is transformer
     * @param {Function} fn default ramda implementation
     * @return {Function} A function that dispatches on object in list position
     */
    var _dispatchable = function _dispatchable(methodname, xf, fn) {
        return function () {
            var length = arguments.length;
            if (length === 0) {
                return fn();
            }
            var obj = arguments[length - 1];
            if (!_isArray(obj)) {
                var args = _slice(arguments, 0, length - 1);
                if (typeof obj[methodname] === 'function') {
                    return obj[methodname].apply(obj, args);
                }
                if (_isTransformer(obj)) {
                    var transducer = xf.apply(null, args);
                    return transducer(obj);
                }
            }
            return fn.apply(this, arguments);
        };
    };

    var _dropLastWhile = function dropLastWhile(pred, list) {
        var idx = list.length - 1;
        while (idx >= 0 && pred(list[idx])) {
            idx -= 1;
        }
        return _slice(list, 0, idx + 1);
    };

    var _xall = function () {
        function XAll(f, xf) {
            this.xf = xf;
            this.f = f;
            this.all = true;
        }
        XAll.prototype['@@transducer/init'] = _xfBase.init;
        XAll.prototype['@@transducer/result'] = function (result) {
            if (this.all) {
                result = this.xf['@@transducer/step'](result, true);
            }
            return this.xf['@@transducer/result'](result);
        };
        XAll.prototype['@@transducer/step'] = function (result, input) {
            if (!this.f(input)) {
                this.all = false;
                result = _reduced(this.xf['@@transducer/step'](result, false));
            }
            return result;
        };
        return _curry2(function _xall(f, xf) {
            return new XAll(f, xf);
        });
    }();

    var _xany = function () {
        function XAny(f, xf) {
            this.xf = xf;
            this.f = f;
            this.any = false;
        }
        XAny.prototype['@@transducer/init'] = _xfBase.init;
        XAny.prototype['@@transducer/result'] = function (result) {
            if (!this.any) {
                result = this.xf['@@transducer/step'](result, false);
            }
            return this.xf['@@transducer/result'](result);
        };
        XAny.prototype['@@transducer/step'] = function (result, input) {
            if (this.f(input)) {
                this.any = true;
                result = _reduced(this.xf['@@transducer/step'](result, true));
            }
            return result;
        };
        return _curry2(function _xany(f, xf) {
            return new XAny(f, xf);
        });
    }();

    var _xaperture = function () {
        function XAperture(n, xf) {
            this.xf = xf;
            this.pos = 0;
            this.full = false;
            this.acc = new Array(n);
        }
        XAperture.prototype['@@transducer/init'] = _xfBase.init;
        XAperture.prototype['@@transducer/result'] = function (result) {
            this.acc = null;
            return this.xf['@@transducer/result'](result);
        };
        XAperture.prototype['@@transducer/step'] = function (result, input) {
            this.store(input);
            return this.full ? this.xf['@@transducer/step'](result, this.getCopy()) : result;
        };
        XAperture.prototype.store = function (input) {
            this.acc[this.pos] = input;
            this.pos += 1;
            if (this.pos === this.acc.length) {
                this.pos = 0;
                this.full = true;
            }
        };
        XAperture.prototype.getCopy = function () {
            return _concat(_slice(this.acc, this.pos), _slice(this.acc, 0, this.pos));
        };
        return _curry2(function _xaperture(n, xf) {
            return new XAperture(n, xf);
        });
    }();

    var _xdrop = function () {
        function XDrop(n, xf) {
            this.xf = xf;
            this.n = n;
        }
        XDrop.prototype['@@transducer/init'] = _xfBase.init;
        XDrop.prototype['@@transducer/result'] = _xfBase.result;
        XDrop.prototype['@@transducer/step'] = function (result, input) {
            if (this.n > 0) {
                this.n -= 1;
                return result;
            }
            return this.xf['@@transducer/step'](result, input);
        };
        return _curry2(function _xdrop(n, xf) {
            return new XDrop(n, xf);
        });
    }();

    var _xdropLast = function () {
        function XDropLast(n, xf) {
            this.xf = xf;
            this.pos = 0;
            this.full = false;
            this.acc = new Array(n);
        }
        XDropLast.prototype['@@transducer/init'] = _xfBase.init;
        XDropLast.prototype['@@transducer/result'] = function (result) {
            this.acc = null;
            return this.xf['@@transducer/result'](result);
        };
        XDropLast.prototype['@@transducer/step'] = function (result, input) {
            if (this.full) {
                result = this.xf['@@transducer/step'](result, this.acc[this.pos]);
            }
            this.store(input);
            return result;
        };
        XDropLast.prototype.store = function (input) {
            this.acc[this.pos] = input;
            this.pos += 1;
            if (this.pos === this.acc.length) {
                this.pos = 0;
                this.full = true;
            }
        };
        return _curry2(function _xdropLast(n, xf) {
            return new XDropLast(n, xf);
        });
    }();

    var _xdropRepeatsWith = function () {
        function XDropRepeatsWith(pred, xf) {
            this.xf = xf;
            this.pred = pred;
            this.lastValue = undefined;
            this.seenFirstValue = false;
        }
        XDropRepeatsWith.prototype['@@transducer/init'] = function () {
            return this.xf['@@transducer/init']();
        };
        XDropRepeatsWith.prototype['@@transducer/result'] = function (result) {
            return this.xf['@@transducer/result'](result);
        };
        XDropRepeatsWith.prototype['@@transducer/step'] = function (result, input) {
            var sameAsLast = false;
            if (!this.seenFirstValue) {
                this.seenFirstValue = true;
            } else if (this.pred(this.lastValue, input)) {
                sameAsLast = true;
            }
            this.lastValue = input;
            return sameAsLast ? result : this.xf['@@transducer/step'](result, input);
        };
        return _curry2(function _xdropRepeatsWith(pred, xf) {
            return new XDropRepeatsWith(pred, xf);
        });
    }();

    var _xdropWhile = function () {
        function XDropWhile(f, xf) {
            this.xf = xf;
            this.f = f;
        }
        XDropWhile.prototype['@@transducer/init'] = _xfBase.init;
        XDropWhile.prototype['@@transducer/result'] = _xfBase.result;
        XDropWhile.prototype['@@transducer/step'] = function (result, input) {
            if (this.f) {
                if (this.f(input)) {
                    return result;
                }
                this.f = null;
            }
            return this.xf['@@transducer/step'](result, input);
        };
        return _curry2(function _xdropWhile(f, xf) {
            return new XDropWhile(f, xf);
        });
    }();

    var _xfilter = function () {
        function XFilter(f, xf) {
            this.xf = xf;
            this.f = f;
        }
        XFilter.prototype['@@transducer/init'] = _xfBase.init;
        XFilter.prototype['@@transducer/result'] = _xfBase.result;
        XFilter.prototype['@@transducer/step'] = function (result, input) {
            return this.f(input) ? this.xf['@@transducer/step'](result, input) : result;
        };
        return _curry2(function _xfilter(f, xf) {
            return new XFilter(f, xf);
        });
    }();

    var _xfind = function () {
        function XFind(f, xf) {
            this.xf = xf;
            this.f = f;
            this.found = false;
        }
        XFind.prototype['@@transducer/init'] = _xfBase.init;
        XFind.prototype['@@transducer/result'] = function (result) {
            if (!this.found) {
                result = this.xf['@@transducer/step'](result, void 0);
            }
            return this.xf['@@transducer/result'](result);
        };
        XFind.prototype['@@transducer/step'] = function (result, input) {
            if (this.f(input)) {
                this.found = true;
                result = _reduced(this.xf['@@transducer/step'](result, input));
            }
            return result;
        };
        return _curry2(function _xfind(f, xf) {
            return new XFind(f, xf);
        });
    }();

    var _xfindIndex = function () {
        function XFindIndex(f, xf) {
            this.xf = xf;
            this.f = f;
            this.idx = -1;
            this.found = false;
        }
        XFindIndex.prototype['@@transducer/init'] = _xfBase.init;
        XFindIndex.prototype['@@transducer/result'] = function (result) {
            if (!this.found) {
                result = this.xf['@@transducer/step'](result, -1);
            }
            return this.xf['@@transducer/result'](result);
        };
        XFindIndex.prototype['@@transducer/step'] = function (result, input) {
            this.idx += 1;
            if (this.f(input)) {
                this.found = true;
                result = _reduced(this.xf['@@transducer/step'](result, this.idx));
            }
            return result;
        };
        return _curry2(function _xfindIndex(f, xf) {
            return new XFindIndex(f, xf);
        });
    }();

    var _xfindLast = function () {
        function XFindLast(f, xf) {
            this.xf = xf;
            this.f = f;
        }
        XFindLast.prototype['@@transducer/init'] = _xfBase.init;
        XFindLast.prototype['@@transducer/result'] = function (result) {
            return this.xf['@@transducer/result'](this.xf['@@transducer/step'](result, this.last));
        };
        XFindLast.prototype['@@transducer/step'] = function (result, input) {
            if (this.f(input)) {
                this.last = input;
            }
            return result;
        };
        return _curry2(function _xfindLast(f, xf) {
            return new XFindLast(f, xf);
        });
    }();

    var _xfindLastIndex = function () {
        function XFindLastIndex(f, xf) {
            this.xf = xf;
            this.f = f;
            this.idx = -1;
            this.lastIdx = -1;
        }
        XFindLastIndex.prototype['@@transducer/init'] = _xfBase.init;
        XFindLastIndex.prototype['@@transducer/result'] = function (result) {
            return this.xf['@@transducer/result'](this.xf['@@transducer/step'](result, this.lastIdx));
        };
        XFindLastIndex.prototype['@@transducer/step'] = function (result, input) {
            this.idx += 1;
            if (this.f(input)) {
                this.lastIdx = this.idx;
            }
            return result;
        };
        return _curry2(function _xfindLastIndex(f, xf) {
            return new XFindLastIndex(f, xf);
        });
    }();

    var _xmap = function () {
        function XMap(f, xf) {
            this.xf = xf;
            this.f = f;
        }
        XMap.prototype['@@transducer/init'] = _xfBase.init;
        XMap.prototype['@@transducer/result'] = _xfBase.result;
        XMap.prototype['@@transducer/step'] = function (result, input) {
            return this.xf['@@transducer/step'](result, this.f(input));
        };
        return _curry2(function _xmap(f, xf) {
            return new XMap(f, xf);
        });
    }();

    var _xreduceBy = function () {
        function XReduceBy(valueFn, valueAcc, keyFn, xf) {
            this.valueFn = valueFn;
            this.valueAcc = valueAcc;
            this.keyFn = keyFn;
            this.xf = xf;
            this.inputs = {};
        }
        XReduceBy.prototype['@@transducer/init'] = _xfBase.init;
        XReduceBy.prototype['@@transducer/result'] = function (result) {
            var key;
            for (key in this.inputs) {
                if (_has(key, this.inputs)) {
                    result = this.xf['@@transducer/step'](result, this.inputs[key]);
                    if (result['@@transducer/reduced']) {
                        result = result['@@transducer/value'];
                        break;
                    }
                }
            }
            this.inputs = null;
            return this.xf['@@transducer/result'](result);
        };
        XReduceBy.prototype['@@transducer/step'] = function (result, input) {
            var key = this.keyFn(input);
            this.inputs[key] = this.inputs[key] || [
                key,
                this.valueAcc
            ];
            this.inputs[key][1] = this.valueFn(this.inputs[key][1], input);
            return result;
        };
        return _curryN(4, [], function _xreduceBy(valueFn, valueAcc, keyFn, xf) {
            return new XReduceBy(valueFn, valueAcc, keyFn, xf);
        });
    }();

    var _xtake = function () {
        function XTake(n, xf) {
            this.xf = xf;
            this.n = n;
            this.i = 0;
        }
        XTake.prototype['@@transducer/init'] = _xfBase.init;
        XTake.prototype['@@transducer/result'] = _xfBase.result;
        XTake.prototype['@@transducer/step'] = function (result, input) {
            this.i += 1;
            var ret = this.n === 0 ? result : this.xf['@@transducer/step'](result, input);
            return this.i >= this.n ? _reduced(ret) : ret;
        };
        return _curry2(function _xtake(n, xf) {
            return new XTake(n, xf);
        });
    }();

    var _xtakeWhile = function () {
        function XTakeWhile(f, xf) {
            this.xf = xf;
            this.f = f;
        }
        XTakeWhile.prototype['@@transducer/init'] = _xfBase.init;
        XTakeWhile.prototype['@@transducer/result'] = _xfBase.result;
        XTakeWhile.prototype['@@transducer/step'] = function (result, input) {
            return this.f(input) ? this.xf['@@transducer/step'](result, input) : _reduced(result);
        };
        return _curry2(function _xtakeWhile(f, xf) {
            return new XTakeWhile(f, xf);
        });
    }();

    /**
     * Adds two values.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Math
     * @sig Number -> Number -> Number
     * @param {Number} a
     * @param {Number} b
     * @return {Number}
     * @see R.subtract
     * @example
     *
     *      R.add(2, 3);       //=>  5
     *      R.add(7)(10);      //=> 17
     */
    var add = _curry2(function add(a, b) {
        return Number(a) + Number(b);
    });

    /**
     * Applies a function to the value at the given index of an array, returning a
     * new copy of the array with the element at the given index replaced with the
     * result of the function application.
     *
     * @func
     * @memberOf R
     * @since v0.14.0
     * @category List
     * @sig (a -> a) -> Number -> [a] -> [a]
     * @param {Function} fn The function to apply.
     * @param {Number} idx The index.
     * @param {Array|Arguments} list An array-like object whose value
     *        at the supplied index will be replaced.
     * @return {Array} A copy of the supplied array-like object with
     *         the element at index `idx` replaced with the value
     *         returned by applying `fn` to the existing element.
     * @see R.update
     * @example
     *
     *      R.adjust(R.add(10), 1, [0, 1, 2]);     //=> [0, 11, 2]
     *      R.adjust(R.add(10))(1)([0, 1, 2]);     //=> [0, 11, 2]
     */
    var adjust = _curry3(function adjust(fn, idx, list) {
        if (idx >= list.length || idx < -list.length) {
            return list;
        }
        var start = idx < 0 ? list.length : 0;
        var _idx = start + idx;
        var _list = _concat(list);
        _list[_idx] = fn(list[_idx]);
        return _list;
    });

    /**
     * Returns `true` if all elements of the list match the predicate, `false` if
     * there are any that don't.
     *
     * Dispatches to the `all` method of the second argument, if present.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig (a -> Boolean) -> [a] -> Boolean
     * @param {Function} fn The predicate function.
     * @param {Array} list The array to consider.
     * @return {Boolean} `true` if the predicate is satisfied by every element, `false`
     *         otherwise.
     * @see R.any, R.none, R.transduce
     * @example
     *
     *      var lessThan2 = R.flip(R.lt)(2);
     *      var lessThan3 = R.flip(R.lt)(3);
     *      R.all(lessThan2)([1, 2]); //=> false
     *      R.all(lessThan3)([1, 2]); //=> true
     */
    var all = _curry2(_dispatchable('all', _xall, function all(fn, list) {
        var idx = 0;
        while (idx < list.length) {
            if (!fn(list[idx])) {
                return false;
            }
            idx += 1;
        }
        return true;
    }));

    /**
     * Returns a function that always returns the given value. Note that for
     * non-primitives the value returned is a reference to the original value.
     *
     * This function is known as `const`, `constant`, or `K` (for K combinator) in
     * other languages and libraries.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Function
     * @sig a -> (* -> a)
     * @param {*} val The value to wrap in a function
     * @return {Function} A Function :: * -> val.
     * @example
     *
     *      var t = R.always('Tee');
     *      t(); //=> 'Tee'
     */
    var always = _curry1(function always(val) {
        return function () {
            return val;
        };
    });

    /**
     * Returns `true` if both arguments are `true`; `false` otherwise.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Logic
     * @sig * -> * -> *
     * @param {Boolean} a A boolean value
     * @param {Boolean} b A boolean value
     * @return {Boolean} `true` if both arguments are `true`, `false` otherwise
     * @see R.both
     * @example
     *
     *      R.and(true, true); //=> true
     *      R.and(true, false); //=> false
     *      R.and(false, true); //=> false
     *      R.and(false, false); //=> false
     */
    var and = _curry2(function and(a, b) {
        return a && b;
    });

    /**
     * Returns `true` if at least one of elements of the list match the predicate,
     * `false` otherwise.
     *
     * Dispatches to the `any` method of the second argument, if present.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig (a -> Boolean) -> [a] -> Boolean
     * @param {Function} fn The predicate function.
     * @param {Array} list The array to consider.
     * @return {Boolean} `true` if the predicate is satisfied by at least one element, `false`
     *         otherwise.
     * @see R.all, R.none, R.transduce
     * @example
     *
     *      var lessThan0 = R.flip(R.lt)(0);
     *      var lessThan2 = R.flip(R.lt)(2);
     *      R.any(lessThan0)([1, 2]); //=> false
     *      R.any(lessThan2)([1, 2]); //=> true
     */
    var any = _curry2(_dispatchable('any', _xany, function any(fn, list) {
        var idx = 0;
        while (idx < list.length) {
            if (fn(list[idx])) {
                return true;
            }
            idx += 1;
        }
        return false;
    }));

    /**
     * Returns a new list, composed of n-tuples of consecutive elements If `n` is
     * greater than the length of the list, an empty list is returned.
     *
     * Dispatches to the `aperture` method of the second argument, if present.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.12.0
     * @category List
     * @sig Number -> [a] -> [[a]]
     * @param {Number} n The size of the tuples to create
     * @param {Array} list The list to split into `n`-tuples
     * @return {Array} The new list.
     * @see R.transduce
     * @example
     *
     *      R.aperture(2, [1, 2, 3, 4, 5]); //=> [[1, 2], [2, 3], [3, 4], [4, 5]]
     *      R.aperture(3, [1, 2, 3, 4, 5]); //=> [[1, 2, 3], [2, 3, 4], [3, 4, 5]]
     *      R.aperture(7, [1, 2, 3, 4, 5]); //=> []
     */
    var aperture = _curry2(_dispatchable('aperture', _xaperture, _aperture));

    /**
     * Returns a new list containing the contents of the given list, followed by
     * the given element.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig a -> [a] -> [a]
     * @param {*} el The element to add to the end of the new list.
     * @param {Array} list The list whose contents will be added to the beginning of the output
     *        list.
     * @return {Array} A new list containing the contents of the old list followed by `el`.
     * @see R.prepend
     * @example
     *
     *      R.append('tests', ['write', 'more']); //=> ['write', 'more', 'tests']
     *      R.append('tests', []); //=> ['tests']
     *      R.append(['tests'], ['write', 'more']); //=> ['write', 'more', ['tests']]
     */
    var append = _curry2(function append(el, list) {
        return _concat(list, [el]);
    });

    /**
     * Applies function `fn` to the argument list `args`. This is useful for
     * creating a fixed-arity function from a variadic function. `fn` should be a
     * bound function if context is significant.
     *
     * @func
     * @memberOf R
     * @since v0.7.0
     * @category Function
     * @sig (*... -> a) -> [*] -> a
     * @param {Function} fn
     * @param {Array} args
     * @return {*}
     * @see R.call, R.unapply
     * @example
     *
     *      var nums = [1, 2, 3, -99, 42, 6, 7];
     *      R.apply(Math.max, nums); //=> 42
     */
    var apply = _curry2(function apply(fn, args) {
        return fn.apply(this, args);
    });

    /**
     * Makes a shallow clone of an object, setting or overriding the specified
     * property with the given value. Note that this copies and flattens prototype
     * properties onto the new object as well. All non-primitive properties are
     * copied by reference.
     *
     * @func
     * @memberOf R
     * @since v0.8.0
     * @category Object
     * @sig String -> a -> {k: v} -> {k: v}
     * @param {String} prop the property name to set
     * @param {*} val the new value
     * @param {Object} obj the object to clone
     * @return {Object} a new object similar to the original except for the specified property.
     * @see R.dissoc
     * @example
     *
     *      R.assoc('c', 3, {a: 1, b: 2}); //=> {a: 1, b: 2, c: 3}
     */
    var assoc = _curry3(function assoc(prop, val, obj) {
        var result = {};
        for (var p in obj) {
            result[p] = obj[p];
        }
        result[prop] = val;
        return result;
    });

    /**
     * Makes a shallow clone of an object, setting or overriding the nodes required
     * to create the given path, and placing the specific value at the tail end of
     * that path. Note that this copies and flattens prototype properties onto the
     * new object as well. All non-primitive properties are copied by reference.
     *
     * @func
     * @memberOf R
     * @since v0.8.0
     * @category Object
     * @sig [String] -> a -> {k: v} -> {k: v}
     * @param {Array} path the path to set
     * @param {*} val the new value
     * @param {Object} obj the object to clone
     * @return {Object} a new object similar to the original except along the specified path.
     * @see R.dissocPath
     * @example
     *
     *      R.assocPath(['a', 'b', 'c'], 42, {a: {b: {c: 0}}}); //=> {a: {b: {c: 42}}}
     */
    var assocPath = _curry3(function assocPath(path, val, obj) {
        switch (path.length) {
        case 0:
            return val;
        case 1:
            return assoc(path[0], val, obj);
        default:
            return assoc(path[0], assocPath(_slice(path, 1), val, Object(obj[path[0]])), obj);
        }
    });

    /**
     * Creates a function that is bound to a context.
     * Note: `R.bind` does not provide the additional argument-binding capabilities of
     * [Function.prototype.bind](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind).
     *
     * @func
     * @memberOf R
     * @since v0.6.0
     * @category Function
     * @category Object
     * @sig (* -> *) -> {*} -> (* -> *)
     * @param {Function} fn The function to bind to context
     * @param {Object} thisObj The context to bind `fn` to
     * @return {Function} A function that will execute in the context of `thisObj`.
     * @see R.partial
     * @example
     *
     *      var log = R.bind(console.log, console);
     *      R.pipe(R.assoc('a', 2), R.tap(log), R.assoc('a', 3))({a: 1}); //=> {a: 3}
     *      // logs {a: 2}
     */
    var bind = _curry2(function bind(fn, thisObj) {
        return _arity(fn.length, function () {
            return fn.apply(thisObj, arguments);
        });
    });

    /**
     * Restricts a number to be within a range.
     *
     * Also works for other ordered types such as Strings and Dates.
     *
     * @func
     * @memberOf R
     * @since v0.20.0
     * @category Relation
     * @sig Ord a => a -> a -> a -> a
     * @param {Number} minimum number
     * @param {Number} maximum number
     * @param {Number} value to be clamped
     * @return {Number} Returns the clamped value
     * @example
     *
     *      R.clamp(1, 10, -1) // => 1
     *      R.clamp(1, 10, 11) // => 10
     *      R.clamp(1, 10, 4)  // => 4
     */
    var clamp = _curry3(function clamp(min, max, value) {
        if (min > max) {
            throw new Error('min must not be greater than max in clamp(min, max, value)');
        }
        return value < min ? min : value > max ? max : value;
    });

    /**
     * Makes a comparator function out of a function that reports whether the first
     * element is less than the second.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Function
     * @sig (a, b -> Boolean) -> (a, b -> Number)
     * @param {Function} pred A predicate function of arity two.
     * @return {Function} A Function :: a -> b -> Int that returns `-1` if a < b, `1` if b < a, otherwise `0`.
     * @example
     *
     *      var cmp = R.comparator((a, b) => a.age < b.age);
     *      var people = [
     *        // ...
     *      ];
     *      R.sort(cmp, people);
     */
    var comparator = _curry1(function comparator(pred) {
        return function (a, b) {
            return pred(a, b) ? -1 : pred(b, a) ? 1 : 0;
        };
    });

    /**
     * Returns a curried equivalent of the provided function, with the specified
     * arity. The curried function has two unusual capabilities. First, its
     * arguments needn't be provided one at a time. If `g` is `R.curryN(3, f)`, the
     * following are equivalent:
     *
     *   - `g(1)(2)(3)`
     *   - `g(1)(2, 3)`
     *   - `g(1, 2)(3)`
     *   - `g(1, 2, 3)`
     *
     * Secondly, the special placeholder value `R.__` may be used to specify
     * "gaps", allowing partial application of any combination of arguments,
     * regardless of their positions. If `g` is as above and `_` is `R.__`, the
     * following are equivalent:
     *
     *   - `g(1, 2, 3)`
     *   - `g(_, 2, 3)(1)`
     *   - `g(_, _, 3)(1)(2)`
     *   - `g(_, _, 3)(1, 2)`
     *   - `g(_, 2)(1)(3)`
     *   - `g(_, 2)(1, 3)`
     *   - `g(_, 2)(_, 3)(1)`
     *
     * @func
     * @memberOf R
     * @since v0.5.0
     * @category Function
     * @sig Number -> (* -> a) -> (* -> a)
     * @param {Number} length The arity for the returned function.
     * @param {Function} fn The function to curry.
     * @return {Function} A new, curried function.
     * @see R.curry
     * @example
     *
     *      var sumArgs = (...args) => R.sum(args);
     *
     *      var curriedAddFourNumbers = R.curryN(4, sumArgs);
     *      var f = curriedAddFourNumbers(1, 2);
     *      var g = f(3);
     *      g(4); //=> 10
     */
    var curryN = _curry2(function curryN(length, fn) {
        if (length === 1) {
            return _curry1(fn);
        }
        return _arity(length, _curryN(length, [], fn));
    });

    /**
     * Decrements its argument.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category Math
     * @sig Number -> Number
     * @param {Number} n
     * @return {Number}
     * @see R.inc
     * @example
     *
     *      R.dec(42); //=> 41
     */
    var dec = add(-1);

    /**
     * Returns the second argument if it is not `null`, `undefined` or `NaN`
     * otherwise the first argument is returned.
     *
     * @func
     * @memberOf R
     * @since v0.10.0
     * @category Logic
     * @sig a -> b -> a | b
     * @param {a} val The default value.
     * @param {b} val The value to return if it is not null or undefined
     * @return {*} The the second value or the default value
     * @example
     *
     *      var defaultTo42 = R.defaultTo(42);
     *
     *      defaultTo42(null);  //=> 42
     *      defaultTo42(undefined);  //=> 42
     *      defaultTo42('Ramda');  //=> 'Ramda'
     *      defaultTo42(parseInt('string')); //=> 42
     */
    var defaultTo = _curry2(function defaultTo(d, v) {
        return v == null || v !== v ? d : v;
    });

    /**
     * Finds the set (i.e. no duplicates) of all elements in the first list not
     * contained in the second list. Duplication is determined according to the
     * value returned by applying the supplied predicate to two list elements.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Relation
     * @sig (a -> a -> Boolean) -> [*] -> [*] -> [*]
     * @param {Function} pred A predicate used to test whether two items are equal.
     * @param {Array} list1 The first list.
     * @param {Array} list2 The second list.
     * @return {Array} The elements in `list1` that are not in `list2`.
     * @see R.difference, R.symmetricDifference, R.symmetricDifferenceWith
     * @example
     *
     *      var cmp = (x, y) => x.a === y.a;
     *      var l1 = [{a: 1}, {a: 2}, {a: 3}];
     *      var l2 = [{a: 3}, {a: 4}];
     *      R.differenceWith(cmp, l1, l2); //=> [{a: 1}, {a: 2}]
     */
    var differenceWith = _curry3(function differenceWith(pred, first, second) {
        var out = [];
        var idx = 0;
        var firstLen = first.length;
        while (idx < firstLen) {
            if (!_containsWith(pred, first[idx], second) && !_containsWith(pred, first[idx], out)) {
                out.push(first[idx]);
            }
            idx += 1;
        }
        return out;
    });

    /**
     * Returns a new object that does not contain a `prop` property.
     *
     * @func
     * @memberOf R
     * @since v0.10.0
     * @category Object
     * @sig String -> {k: v} -> {k: v}
     * @param {String} prop the name of the property to dissociate
     * @param {Object} obj the object to clone
     * @return {Object} a new object similar to the original but without the specified property
     * @see R.assoc
     * @example
     *
     *      R.dissoc('b', {a: 1, b: 2, c: 3}); //=> {a: 1, c: 3}
     */
    var dissoc = _curry2(function dissoc(prop, obj) {
        var result = {};
        for (var p in obj) {
            if (p !== prop) {
                result[p] = obj[p];
            }
        }
        return result;
    });

    /**
     * Makes a shallow clone of an object, omitting the property at the given path.
     * Note that this copies and flattens prototype properties onto the new object
     * as well. All non-primitive properties are copied by reference.
     *
     * @func
     * @memberOf R
     * @since v0.11.0
     * @category Object
     * @sig [String] -> {k: v} -> {k: v}
     * @param {Array} path the path to set
     * @param {Object} obj the object to clone
     * @return {Object} a new object without the property at path
     * @see R.assocPath
     * @example
     *
     *      R.dissocPath(['a', 'b', 'c'], {a: {b: {c: 42}}}); //=> {a: {b: {}}}
     */
    var dissocPath = _curry2(function dissocPath(path, obj) {
        switch (path.length) {
        case 0:
            return obj;
        case 1:
            return dissoc(path[0], obj);
        default:
            var head = path[0];
            var tail = _slice(path, 1);
            return obj[head] == null ? obj : assoc(head, dissocPath(tail, obj[head]), obj);
        }
    });

    /**
     * Divides two numbers. Equivalent to `a / b`.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Math
     * @sig Number -> Number -> Number
     * @param {Number} a The first value.
     * @param {Number} b The second value.
     * @return {Number} The result of `a / b`.
     * @see R.multiply
     * @example
     *
     *      R.divide(71, 100); //=> 0.71
     *
     *      var half = R.divide(R.__, 2);
     *      half(42); //=> 21
     *
     *      var reciprocal = R.divide(1);
     *      reciprocal(4);   //=> 0.25
     */
    var divide = _curry2(function divide(a, b) {
        return a / b;
    });

    /**
     * Returns a new list excluding the leading elements of a given list which
     * satisfy the supplied predicate function. It passes each value to the supplied
     * predicate function, skipping elements while the predicate function returns
     * `true`. The predicate function is applied to one argument: *(value)*.
     *
     * Dispatches to the `dropWhile` method of the second argument, if present.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category List
     * @sig (a -> Boolean) -> [a] -> [a]
     * @param {Function} fn The function called per iteration.
     * @param {Array} list The collection to iterate over.
     * @return {Array} A new array.
     * @see R.takeWhile, R.transduce, R.addIndex
     * @example
     *
     *      var lteTwo = x => x <= 2;
     *
     *      R.dropWhile(lteTwo, [1, 2, 3, 4, 3, 2, 1]); //=> [3, 4, 3, 2, 1]
     */
    var dropWhile = _curry2(_dispatchable('dropWhile', _xdropWhile, function dropWhile(pred, list) {
        var idx = 0;
        var len = list.length;
        while (idx < len && pred(list[idx])) {
            idx += 1;
        }
        return _slice(list, idx);
    }));

    /**
     * Returns the empty value of its argument's type. Ramda defines the empty
     * value of Array (`[]`), Object (`{}`), String (`''`), and Arguments. Other
     * types are supported if they define `<Type>.empty` and/or
     * `<Type>.prototype.empty`.
     *
     * Dispatches to the `empty` method of the first argument, if present.
     *
     * @func
     * @memberOf R
     * @since v0.3.0
     * @category Function
     * @sig a -> a
     * @param {*} x
     * @return {*}
     * @example
     *
     *      R.empty(Just(42));      //=> Nothing()
     *      R.empty([1, 2, 3]);     //=> []
     *      R.empty('unicorns');    //=> ''
     *      R.empty({x: 1, y: 2});  //=> {}
     */
    // else
    var empty = _curry1(function empty(x) {
        return x != null && typeof x.empty === 'function' ? x.empty() : x != null && x.constructor != null && typeof x.constructor.empty === 'function' ? x.constructor.empty() : _isArray(x) ? [] : _isString(x) ? '' : _isObject(x) ? {} : _isArguments(x) ? function () {
            return arguments;
        }() : // else
        void 0;
    });

    /**
     * Creates a new object by recursively evolving a shallow copy of `object`,
     * according to the `transformation` functions. All non-primitive properties
     * are copied by reference.
     *
     * A `transformation` function will not be invoked if its corresponding key
     * does not exist in the evolved object.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category Object
     * @sig {k: (v -> v)} -> {k: v} -> {k: v}
     * @param {Object} transformations The object specifying transformation functions to apply
     *        to the object.
     * @param {Object} object The object to be transformed.
     * @return {Object} The transformed object.
     * @example
     *
     *      var tomato  = {firstName: '  Tomato ', data: {elapsed: 100, remaining: 1400}, id:123};
     *      var transformations = {
     *        firstName: R.trim,
     *        lastName: R.trim, // Will not get invoked.
     *        data: {elapsed: R.add(1), remaining: R.add(-1)}
     *      };
     *      R.evolve(transformations, tomato); //=> {firstName: 'Tomato', data: {elapsed: 101, remaining: 1399}, id:123}
     */
    var evolve = _curry2(function evolve(transformations, object) {
        var result = {};
        var transformation, key, type;
        for (key in object) {
            transformation = transformations[key];
            type = typeof transformation;
            result[key] = type === 'function' ? transformation(object[key]) : type === 'object' ? evolve(transformations[key], object[key]) : object[key];
        }
        return result;
    });

    /**
     * Returns the first element of the list which matches the predicate, or
     * `undefined` if no element matches.
     *
     * Dispatches to the `find` method of the second argument, if present.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig (a -> Boolean) -> [a] -> a | undefined
     * @param {Function} fn The predicate function used to determine if the element is the
     *        desired one.
     * @param {Array} list The array to consider.
     * @return {Object} The element found, or `undefined`.
     * @see R.transduce
     * @example
     *
     *      var xs = [{a: 1}, {a: 2}, {a: 3}];
     *      R.find(R.propEq('a', 2))(xs); //=> {a: 2}
     *      R.find(R.propEq('a', 4))(xs); //=> undefined
     */
    var find = _curry2(_dispatchable('find', _xfind, function find(fn, list) {
        var idx = 0;
        var len = list.length;
        while (idx < len) {
            if (fn(list[idx])) {
                return list[idx];
            }
            idx += 1;
        }
    }));

    /**
     * Returns the index of the first element of the list which matches the
     * predicate, or `-1` if no element matches.
     *
     * Dispatches to the `findIndex` method of the second argument, if present.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.1.1
     * @category List
     * @sig (a -> Boolean) -> [a] -> Number
     * @param {Function} fn The predicate function used to determine if the element is the
     * desired one.
     * @param {Array} list The array to consider.
     * @return {Number} The index of the element found, or `-1`.
     * @see R.transduce
     * @example
     *
     *      var xs = [{a: 1}, {a: 2}, {a: 3}];
     *      R.findIndex(R.propEq('a', 2))(xs); //=> 1
     *      R.findIndex(R.propEq('a', 4))(xs); //=> -1
     */
    var findIndex = _curry2(_dispatchable('findIndex', _xfindIndex, function findIndex(fn, list) {
        var idx = 0;
        var len = list.length;
        while (idx < len) {
            if (fn(list[idx])) {
                return idx;
            }
            idx += 1;
        }
        return -1;
    }));

    /**
     * Returns the last element of the list which matches the predicate, or
     * `undefined` if no element matches.
     *
     * Dispatches to the `findLast` method of the second argument, if present.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.1.1
     * @category List
     * @sig (a -> Boolean) -> [a] -> a | undefined
     * @param {Function} fn The predicate function used to determine if the element is the
     * desired one.
     * @param {Array} list The array to consider.
     * @return {Object} The element found, or `undefined`.
     * @see R.transduce
     * @example
     *
     *      var xs = [{a: 1, b: 0}, {a:1, b: 1}];
     *      R.findLast(R.propEq('a', 1))(xs); //=> {a: 1, b: 1}
     *      R.findLast(R.propEq('a', 4))(xs); //=> undefined
     */
    var findLast = _curry2(_dispatchable('findLast', _xfindLast, function findLast(fn, list) {
        var idx = list.length - 1;
        while (idx >= 0) {
            if (fn(list[idx])) {
                return list[idx];
            }
            idx -= 1;
        }
    }));

    /**
     * Returns the index of the last element of the list which matches the
     * predicate, or `-1` if no element matches.
     *
     * Dispatches to the `findLastIndex` method of the second argument, if present.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.1.1
     * @category List
     * @sig (a -> Boolean) -> [a] -> Number
     * @param {Function} fn The predicate function used to determine if the element is the
     * desired one.
     * @param {Array} list The array to consider.
     * @return {Number} The index of the element found, or `-1`.
     * @see R.transduce
     * @example
     *
     *      var xs = [{a: 1, b: 0}, {a:1, b: 1}];
     *      R.findLastIndex(R.propEq('a', 1))(xs); //=> 1
     *      R.findLastIndex(R.propEq('a', 4))(xs); //=> -1
     */
    var findLastIndex = _curry2(_dispatchable('findLastIndex', _xfindLastIndex, function findLastIndex(fn, list) {
        var idx = list.length - 1;
        while (idx >= 0) {
            if (fn(list[idx])) {
                return idx;
            }
            idx -= 1;
        }
        return -1;
    }));

    /**
     * Iterate over an input `list`, calling a provided function `fn` for each
     * element in the list.
     *
     * `fn` receives one argument: *(value)*.
     *
     * Note: `R.forEach` does not skip deleted or unassigned indices (sparse
     * arrays), unlike the native `Array.prototype.forEach` method. For more
     * details on this behavior, see:
     * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach#Description
     *
     * Also note that, unlike `Array.prototype.forEach`, Ramda's `forEach` returns
     * the original array. In some libraries this function is named `each`.
     *
     * Dispatches to the `forEach` method of the second argument, if present.
     *
     * @func
     * @memberOf R
     * @since v0.1.1
     * @category List
     * @sig (a -> *) -> [a] -> [a]
     * @param {Function} fn The function to invoke. Receives one argument, `value`.
     * @param {Array} list The list to iterate over.
     * @return {Array} The original list.
     * @see R.addIndex
     * @example
     *
     *      var printXPlusFive = x => console.log(x + 5);
     *      R.forEach(printXPlusFive, [1, 2, 3]); //=> [1, 2, 3]
     *      // logs 6
     *      // logs 7
     *      // logs 8
     */
    var forEach = _curry2(_checkForMethod('forEach', function forEach(fn, list) {
        var len = list.length;
        var idx = 0;
        while (idx < len) {
            fn(list[idx]);
            idx += 1;
        }
        return list;
    }));

    /**
     * Creates a new object from a list key-value pairs. If a key appears in
     * multiple pairs, the rightmost pair is included in the object.
     *
     * @func
     * @memberOf R
     * @since v0.3.0
     * @category List
     * @sig [[k,v]] -> {k: v}
     * @param {Array} pairs An array of two-element arrays that will be the keys and values of the output object.
     * @return {Object} The object made by pairing up `keys` and `values`.
     * @see R.toPairs, R.pair
     * @example
     *
     *      R.fromPairs([['a', 1], ['b', 2], ['c', 3]]); //=> {a: 1, b: 2, c: 3}
     */
    var fromPairs = _curry1(function fromPairs(pairs) {
        var result = {};
        var idx = 0;
        while (idx < pairs.length) {
            result[pairs[idx][0]] = pairs[idx][1];
            idx += 1;
        }
        return result;
    });

    /**
     * Takes a list and returns a list of lists where each sublist's elements are
     * all "equal" according to the provided equality function.
     *
     * @func
     * @memberOf R
     * @since v0.21.0
     * @category List
     * @sig ((a, a) → Boolean) → [a] → [[a]]
     * @param {Function} fn Function for determining whether two given (adjacent)
     *        elements should be in the same group
     * @param {Array} list The array to group. Also accepts a string, which will be
     *        treated as a list of characters.
     * @return {List} A list that contains sublists of equal elements,
     *         whose concatenations are equal to the original list.
     * @example
     *
     * R.groupWith(R.equals, [0, 1, 1, 2, 3, 5, 8, 13, 21])
     * //=> [[0], [1, 1], [2], [3], [5], [8], [13], [21]]
     *
     * R.groupWith((a, b) => a % 2 === b % 2, [0, 1, 1, 2, 3, 5, 8, 13, 21])
     * //=> [[0], [1, 1], [2], [3, 5], [8], [13, 21]]
     *
     * R.groupWith(R.eqBy(isVowel), 'aestiou')
     * //=> ['ae', 'st', 'iou']
     */
    var groupWith = _curry2(function (fn, list) {
        var res = [];
        var idx = 0;
        var len = list.length;
        while (idx < len) {
            var nextidx = idx + 1;
            while (nextidx < len && fn(list[idx], list[nextidx])) {
                nextidx += 1;
            }
            res.push(list.slice(idx, nextidx));
            idx = nextidx;
        }
        return res;
    });

    /**
     * Returns `true` if the first argument is greater than the second; `false`
     * otherwise.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Relation
     * @sig Ord a => a -> a -> Boolean
     * @param {*} a
     * @param {*} b
     * @return {Boolean}
     * @see R.lt
     * @example
     *
     *      R.gt(2, 1); //=> true
     *      R.gt(2, 2); //=> false
     *      R.gt(2, 3); //=> false
     *      R.gt('a', 'z'); //=> false
     *      R.gt('z', 'a'); //=> true
     */
    var gt = _curry2(function gt(a, b) {
        return a > b;
    });

    /**
     * Returns `true` if the first argument is greater than or equal to the second;
     * `false` otherwise.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Relation
     * @sig Ord a => a -> a -> Boolean
     * @param {Number} a
     * @param {Number} b
     * @return {Boolean}
     * @see R.lte
     * @example
     *
     *      R.gte(2, 1); //=> true
     *      R.gte(2, 2); //=> true
     *      R.gte(2, 3); //=> false
     *      R.gte('a', 'z'); //=> false
     *      R.gte('z', 'a'); //=> true
     */
    var gte = _curry2(function gte(a, b) {
        return a >= b;
    });

    /**
     * Returns whether or not an object has an own property with the specified name
     *
     * @func
     * @memberOf R
     * @since v0.7.0
     * @category Object
     * @sig s -> {s: x} -> Boolean
     * @param {String} prop The name of the property to check for.
     * @param {Object} obj The object to query.
     * @return {Boolean} Whether the property exists.
     * @example
     *
     *      var hasName = R.has('name');
     *      hasName({name: 'alice'});   //=> true
     *      hasName({name: 'bob'});     //=> true
     *      hasName({});                //=> false
     *
     *      var point = {x: 0, y: 0};
     *      var pointHas = R.has(R.__, point);
     *      pointHas('x');  //=> true
     *      pointHas('y');  //=> true
     *      pointHas('z');  //=> false
     */
    var has = _curry2(_has);

    /**
     * Returns whether or not an object or its prototype chain has a property with
     * the specified name
     *
     * @func
     * @memberOf R
     * @since v0.7.0
     * @category Object
     * @sig s -> {s: x} -> Boolean
     * @param {String} prop The name of the property to check for.
     * @param {Object} obj The object to query.
     * @return {Boolean} Whether the property exists.
     * @example
     *
     *      function Rectangle(width, height) {
     *        this.width = width;
     *        this.height = height;
     *      }
     *      Rectangle.prototype.area = function() {
     *        return this.width * this.height;
     *      };
     *
     *      var square = new Rectangle(2, 2);
     *      R.hasIn('width', square);  //=> true
     *      R.hasIn('area', square);  //=> true
     */
    var hasIn = _curry2(function hasIn(prop, obj) {
        return prop in obj;
    });

    /**
     * Returns true if its arguments are identical, false otherwise. Values are
     * identical if they reference the same memory. `NaN` is identical to `NaN`;
     * `0` and `-0` are not identical.
     *
     * @func
     * @memberOf R
     * @since v0.15.0
     * @category Relation
     * @sig a -> a -> Boolean
     * @param {*} a
     * @param {*} b
     * @return {Boolean}
     * @example
     *
     *      var o = {};
     *      R.identical(o, o); //=> true
     *      R.identical(1, 1); //=> true
     *      R.identical(1, '1'); //=> false
     *      R.identical([], []); //=> false
     *      R.identical(0, -0); //=> false
     *      R.identical(NaN, NaN); //=> true
     */
    // SameValue algorithm
    // Steps 1-5, 7-10
    // Steps 6.b-6.e: +0 != -0
    // Step 6.a: NaN == NaN
    var identical = _curry2(function identical(a, b) {
        // SameValue algorithm
        if (a === b) {
            // Steps 1-5, 7-10
            // Steps 6.b-6.e: +0 != -0
            return a !== 0 || 1 / a === 1 / b;
        } else {
            // Step 6.a: NaN == NaN
            return a !== a && b !== b;
        }
    });

    /**
     * A function that does nothing but return the parameter supplied to it. Good
     * as a default or placeholder function.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Function
     * @sig a -> a
     * @param {*} x The value to return.
     * @return {*} The input value, `x`.
     * @example
     *
     *      R.identity(1); //=> 1
     *
     *      var obj = {};
     *      R.identity(obj) === obj; //=> true
     */
    var identity = _curry1(_identity);

    /**
     * Creates a function that will process either the `onTrue` or the `onFalse`
     * function depending upon the result of the `condition` predicate.
     *
     * @func
     * @memberOf R
     * @since v0.8.0
     * @category Logic
     * @sig (*... -> Boolean) -> (*... -> *) -> (*... -> *) -> (*... -> *)
     * @param {Function} condition A predicate function
     * @param {Function} onTrue A function to invoke when the `condition` evaluates to a truthy value.
     * @param {Function} onFalse A function to invoke when the `condition` evaluates to a falsy value.
     * @return {Function} A new unary function that will process either the `onTrue` or the `onFalse`
     *                    function depending upon the result of the `condition` predicate.
     * @see R.unless, R.when
     * @example
     *
     *      var incCount = R.ifElse(
     *        R.has('count'),
     *        R.over(R.lensProp('count'), R.inc),
     *        R.assoc('count', 1)
     *      );
     *      incCount({});           //=> { count: 1 }
     *      incCount({ count: 1 }); //=> { count: 2 }
     */
    var ifElse = _curry3(function ifElse(condition, onTrue, onFalse) {
        return curryN(Math.max(condition.length, onTrue.length, onFalse.length), function _ifElse() {
            return condition.apply(this, arguments) ? onTrue.apply(this, arguments) : onFalse.apply(this, arguments);
        });
    });

    /**
     * Increments its argument.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category Math
     * @sig Number -> Number
     * @param {Number} n
     * @return {Number}
     * @see R.dec
     * @example
     *
     *      R.inc(42); //=> 43
     */
    var inc = add(1);

    /**
     * Inserts the supplied element into the list, at index `index`. _Note that
     * this is not destructive_: it returns a copy of the list with the changes.
     * <small>No lists have been harmed in the application of this function.</small>
     *
     * @func
     * @memberOf R
     * @since v0.2.2
     * @category List
     * @sig Number -> a -> [a] -> [a]
     * @param {Number} index The position to insert the element
     * @param {*} elt The element to insert into the Array
     * @param {Array} list The list to insert into
     * @return {Array} A new Array with `elt` inserted at `index`.
     * @example
     *
     *      R.insert(2, 'x', [1,2,3,4]); //=> [1,2,'x',3,4]
     */
    var insert = _curry3(function insert(idx, elt, list) {
        idx = idx < list.length && idx >= 0 ? idx : list.length;
        var result = _slice(list);
        result.splice(idx, 0, elt);
        return result;
    });

    /**
     * Inserts the sub-list into the list, at index `index`. _Note that this is not
     * destructive_: it returns a copy of the list with the changes.
     * <small>No lists have been harmed in the application of this function.</small>
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category List
     * @sig Number -> [a] -> [a] -> [a]
     * @param {Number} index The position to insert the sub-list
     * @param {Array} elts The sub-list to insert into the Array
     * @param {Array} list The list to insert the sub-list into
     * @return {Array} A new Array with `elts` inserted starting at `index`.
     * @example
     *
     *      R.insertAll(2, ['x','y','z'], [1,2,3,4]); //=> [1,2,'x','y','z',3,4]
     */
    var insertAll = _curry3(function insertAll(idx, elts, list) {
        idx = idx < list.length && idx >= 0 ? idx : list.length;
        return _concat(_concat(_slice(list, 0, idx), elts), _slice(list, idx));
    });

    /**
     * Creates a new list with the separator interposed between elements.
     *
     * Dispatches to the `intersperse` method of the second argument, if present.
     *
     * @func
     * @memberOf R
     * @since v0.14.0
     * @category List
     * @sig a -> [a] -> [a]
     * @param {*} separator The element to add to the list.
     * @param {Array} list The list to be interposed.
     * @return {Array} The new list.
     * @example
     *
     *      R.intersperse('n', ['ba', 'a', 'a']); //=> ['ba', 'n', 'a', 'n', 'a']
     */
    var intersperse = _curry2(_checkForMethod('intersperse', function intersperse(separator, list) {
        var out = [];
        var idx = 0;
        var length = list.length;
        while (idx < length) {
            if (idx === length - 1) {
                out.push(list[idx]);
            } else {
                out.push(list[idx], separator);
            }
            idx += 1;
        }
        return out;
    }));

    /**
     * See if an object (`val`) is an instance of the supplied constructor. This
     * function will check up the inheritance chain, if any.
     *
     * @func
     * @memberOf R
     * @since v0.3.0
     * @category Type
     * @sig (* -> {*}) -> a -> Boolean
     * @param {Object} ctor A constructor
     * @param {*} val The value to test
     * @return {Boolean}
     * @example
     *
     *      R.is(Object, {}); //=> true
     *      R.is(Number, 1); //=> true
     *      R.is(Object, 1); //=> false
     *      R.is(String, 's'); //=> true
     *      R.is(String, new String('')); //=> true
     *      R.is(Object, new String('')); //=> true
     *      R.is(Object, 's'); //=> false
     *      R.is(Number, {}); //=> false
     */
    var is = _curry2(function is(Ctor, val) {
        return val != null && val.constructor === Ctor || val instanceof Ctor;
    });

    /**
     * Tests whether or not an object is similar to an array.
     *
     * @func
     * @memberOf R
     * @since v0.5.0
     * @category Type
     * @category List
     * @sig * -> Boolean
     * @param {*} x The object to test.
     * @return {Boolean} `true` if `x` has a numeric length property and extreme indices defined; `false` otherwise.
     * @example
     *
     *      R.isArrayLike([]); //=> true
     *      R.isArrayLike(true); //=> false
     *      R.isArrayLike({}); //=> false
     *      R.isArrayLike({length: 10}); //=> false
     *      R.isArrayLike({0: 'zero', 9: 'nine', length: 10}); //=> true
     */
    var isArrayLike = _curry1(function isArrayLike(x) {
        if (_isArray(x)) {
            return true;
        }
        if (!x) {
            return false;
        }
        if (typeof x !== 'object') {
            return false;
        }
        if (_isString(x)) {
            return false;
        }
        if (x.nodeType === 1) {
            return !!x.length;
        }
        if (x.length === 0) {
            return true;
        }
        if (x.length > 0) {
            return x.hasOwnProperty(0) && x.hasOwnProperty(x.length - 1);
        }
        return false;
    });

    /**
     * Checks if the input value is `null` or `undefined`.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category Type
     * @sig * -> Boolean
     * @param {*} x The value to test.
     * @return {Boolean} `true` if `x` is `undefined` or `null`, otherwise `false`.
     * @example
     *
     *      R.isNil(null); //=> true
     *      R.isNil(undefined); //=> true
     *      R.isNil(0); //=> false
     *      R.isNil([]); //=> false
     */
    var isNil = _curry1(function isNil(x) {
        return x == null;
    });

    /**
     * Returns a list containing the names of all the enumerable own properties of
     * the supplied object.
     * Note that the order of the output array is not guaranteed to be consistent
     * across different JS platforms.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Object
     * @sig {k: v} -> [k]
     * @param {Object} obj The object to extract properties from
     * @return {Array} An array of the object's own properties.
     * @example
     *
     *      R.keys({a: 1, b: 2, c: 3}); //=> ['a', 'b', 'c']
     */
    // cover IE < 9 keys issues
    // Safari bug
    var keys = function () {
        // cover IE < 9 keys issues
        var hasEnumBug = !{ toString: null }.propertyIsEnumerable('toString');
        var nonEnumerableProps = [
            'constructor',
            'valueOf',
            'isPrototypeOf',
            'toString',
            'propertyIsEnumerable',
            'hasOwnProperty',
            'toLocaleString'
        ];
        // Safari bug
        var hasArgsEnumBug = function () {
            'use strict';
            return arguments.propertyIsEnumerable('length');
        }();
        var contains = function contains(list, item) {
            var idx = 0;
            while (idx < list.length) {
                if (list[idx] === item) {
                    return true;
                }
                idx += 1;
            }
            return false;
        };
        return typeof Object.keys === 'function' && !hasArgsEnumBug ? _curry1(function keys(obj) {
            return Object(obj) !== obj ? [] : Object.keys(obj);
        }) : _curry1(function keys(obj) {
            if (Object(obj) !== obj) {
                return [];
            }
            var prop, nIdx;
            var ks = [];
            var checkArgsLength = hasArgsEnumBug && _isArguments(obj);
            for (prop in obj) {
                if (_has(prop, obj) && (!checkArgsLength || prop !== 'length')) {
                    ks[ks.length] = prop;
                }
            }
            if (hasEnumBug) {
                nIdx = nonEnumerableProps.length - 1;
                while (nIdx >= 0) {
                    prop = nonEnumerableProps[nIdx];
                    if (_has(prop, obj) && !contains(ks, prop)) {
                        ks[ks.length] = prop;
                    }
                    nIdx -= 1;
                }
            }
            return ks;
        });
    }();

    /**
     * Returns a list containing the names of all the properties of the supplied
     * object, including prototype properties.
     * Note that the order of the output array is not guaranteed to be consistent
     * across different JS platforms.
     *
     * @func
     * @memberOf R
     * @since v0.2.0
     * @category Object
     * @sig {k: v} -> [k]
     * @param {Object} obj The object to extract properties from
     * @return {Array} An array of the object's own and prototype properties.
     * @example
     *
     *      var F = function() { this.x = 'X'; };
     *      F.prototype.y = 'Y';
     *      var f = new F();
     *      R.keysIn(f); //=> ['x', 'y']
     */
    var keysIn = _curry1(function keysIn(obj) {
        var prop;
        var ks = [];
        for (prop in obj) {
            ks[ks.length] = prop;
        }
        return ks;
    });

    /**
     * Returns the number of elements in the array by returning `list.length`.
     *
     * @func
     * @memberOf R
     * @since v0.3.0
     * @category List
     * @sig [a] -> Number
     * @param {Array} list The array to inspect.
     * @return {Number} The length of the array.
     * @example
     *
     *      R.length([]); //=> 0
     *      R.length([1, 2, 3]); //=> 3
     */
    var length = _curry1(function length(list) {
        return list != null && _isNumber(list.length) ? list.length : NaN;
    });

    /**
     * Returns `true` if the first argument is less than the second; `false`
     * otherwise.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Relation
     * @sig Ord a => a -> a -> Boolean
     * @param {*} a
     * @param {*} b
     * @return {Boolean}
     * @see R.gt
     * @example
     *
     *      R.lt(2, 1); //=> false
     *      R.lt(2, 2); //=> false
     *      R.lt(2, 3); //=> true
     *      R.lt('a', 'z'); //=> true
     *      R.lt('z', 'a'); //=> false
     */
    var lt = _curry2(function lt(a, b) {
        return a < b;
    });

    /**
     * Returns `true` if the first argument is less than or equal to the second;
     * `false` otherwise.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Relation
     * @sig Ord a => a -> a -> Boolean
     * @param {Number} a
     * @param {Number} b
     * @return {Boolean}
     * @see R.gte
     * @example
     *
     *      R.lte(2, 1); //=> false
     *      R.lte(2, 2); //=> true
     *      R.lte(2, 3); //=> true
     *      R.lte('a', 'z'); //=> true
     *      R.lte('z', 'a'); //=> false
     */
    var lte = _curry2(function lte(a, b) {
        return a <= b;
    });

    /**
     * The mapAccum function behaves like a combination of map and reduce; it
     * applies a function to each element of a list, passing an accumulating
     * parameter from left to right, and returning a final value of this
     * accumulator together with the new list.
     *
     * The iterator function receives two arguments, *acc* and *value*, and should
     * return a tuple *[acc, value]*.
     *
     * @func
     * @memberOf R
     * @since v0.10.0
     * @category List
     * @sig (acc -> x -> (acc, y)) -> acc -> [x] -> (acc, [y])
     * @param {Function} fn The function to be called on every element of the input `list`.
     * @param {*} acc The accumulator value.
     * @param {Array} list The list to iterate over.
     * @return {*} The final, accumulated value.
     * @see R.addIndex
     * @example
     *
     *      var digits = ['1', '2', '3', '4'];
     *      var appender = (a, b) => [a + b, a + b];
     *
     *      R.mapAccum(appender, 0, digits); //=> ['01234', ['01', '012', '0123', '01234']]
     */
    var mapAccum = _curry3(function mapAccum(fn, acc, list) {
        var idx = 0;
        var len = list.length;
        var result = [];
        var tuple = [acc];
        while (idx < len) {
            tuple = fn(tuple[0], list[idx]);
            result[idx] = tuple[1];
            idx += 1;
        }
        return [
            tuple[0],
            result
        ];
    });

    /**
     * The mapAccumRight function behaves like a combination of map and reduce; it
     * applies a function to each element of a list, passing an accumulating
     * parameter from right to left, and returning a final value of this
     * accumulator together with the new list.
     *
     * Similar to `mapAccum`, except moves through the input list from the right to
     * the left.
     *
     * The iterator function receives two arguments, *acc* and *value*, and should
     * return a tuple *[acc, value]*.
     *
     * @func
     * @memberOf R
     * @since v0.10.0
     * @category List
     * @sig (acc -> x -> (acc, y)) -> acc -> [x] -> (acc, [y])
     * @param {Function} fn The function to be called on every element of the input `list`.
     * @param {*} acc The accumulator value.
     * @param {Array} list The list to iterate over.
     * @return {*} The final, accumulated value.
     * @see R.addIndex
     * @example
     *
     *      var digits = ['1', '2', '3', '4'];
     *      var append = (a, b) => [a + b, a + b];
     *
     *      R.mapAccumRight(append, 0, digits); //=> ['04321', ['04321', '0432', '043', '04']]
     */
    var mapAccumRight = _curry3(function mapAccumRight(fn, acc, list) {
        var idx = list.length - 1;
        var result = [];
        var tuple = [acc];
        while (idx >= 0) {
            tuple = fn(tuple[0], list[idx]);
            result[idx] = tuple[1];
            idx -= 1;
        }
        return [
            tuple[0],
            result
        ];
    });

    /**
     * Tests a regular expression against a String. Note that this function will
     * return an empty array when there are no matches. This differs from
     * [`String.prototype.match`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/match)
     * which returns `null` when there are no matches.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category String
     * @sig RegExp -> String -> [String | Undefined]
     * @param {RegExp} rx A regular expression.
     * @param {String} str The string to match against
     * @return {Array} The list of matches or empty array.
     * @see R.test
     * @example
     *
     *      R.match(/([a-z]a)/g, 'bananas'); //=> ['ba', 'na', 'na']
     *      R.match(/a/, 'b'); //=> []
     *      R.match(/a/, null); //=> TypeError: null does not have a method named "match"
     */
    var match = _curry2(function match(rx, str) {
        return str.match(rx) || [];
    });

    /**
     * mathMod behaves like the modulo operator should mathematically, unlike the
     * `%` operator (and by extension, R.modulo). So while "-17 % 5" is -2,
     * mathMod(-17, 5) is 3. mathMod requires Integer arguments, and returns NaN
     * when the modulus is zero or negative.
     *
     * @func
     * @memberOf R
     * @since v0.3.0
     * @category Math
     * @sig Number -> Number -> Number
     * @param {Number} m The dividend.
     * @param {Number} p the modulus.
     * @return {Number} The result of `b mod a`.
     * @example
     *
     *      R.mathMod(-17, 5);  //=> 3
     *      R.mathMod(17, 5);   //=> 2
     *      R.mathMod(17, -5);  //=> NaN
     *      R.mathMod(17, 0);   //=> NaN
     *      R.mathMod(17.2, 5); //=> NaN
     *      R.mathMod(17, 5.3); //=> NaN
     *
     *      var clock = R.mathMod(R.__, 12);
     *      clock(15); //=> 3
     *      clock(24); //=> 0
     *
     *      var seventeenMod = R.mathMod(17);
     *      seventeenMod(3);  //=> 2
     *      seventeenMod(4);  //=> 1
     *      seventeenMod(10); //=> 7
     */
    var mathMod = _curry2(function mathMod(m, p) {
        if (!_isInteger(m)) {
            return NaN;
        }
        if (!_isInteger(p) || p < 1) {
            return NaN;
        }
        return (m % p + p) % p;
    });

    /**
     * Returns the larger of its two arguments.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Relation
     * @sig Ord a => a -> a -> a
     * @param {*} a
     * @param {*} b
     * @return {*}
     * @see R.maxBy, R.min
     * @example
     *
     *      R.max(789, 123); //=> 789
     *      R.max('a', 'b'); //=> 'b'
     */
    var max = _curry2(function max(a, b) {
        return b > a ? b : a;
    });

    /**
     * Takes a function and two values, and returns whichever value produces the
     * larger result when passed to the provided function.
     *
     * @func
     * @memberOf R
     * @since v0.8.0
     * @category Relation
     * @sig Ord b => (a -> b) -> a -> a -> a
     * @param {Function} f
     * @param {*} a
     * @param {*} b
     * @return {*}
     * @see R.max, R.minBy
     * @example
     *
     *      //  square :: Number -> Number
     *      var square = n => n * n;
     *
     *      R.maxBy(square, -3, 2); //=> -3
     *
     *      R.reduce(R.maxBy(square), 0, [3, -5, 4, 1, -2]); //=> -5
     *      R.reduce(R.maxBy(square), 0, []); //=> 0
     */
    var maxBy = _curry3(function maxBy(f, a, b) {
        return f(b) > f(a) ? b : a;
    });

    /**
     * Create a new object with the own properties of the first object merged with
     * the own properties of the second object. If a key exists in both objects,
     * the value from the second object will be used.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Object
     * @sig {k: v} -> {k: v} -> {k: v}
     * @param {Object} l
     * @param {Object} r
     * @return {Object}
     * @see R.mergeWith, R.mergeWithKey
     * @example
     *
     *      R.merge({ 'name': 'fred', 'age': 10 }, { 'age': 40 });
     *      //=> { 'name': 'fred', 'age': 40 }
     *
     *      var resetToDefault = R.merge(R.__, {x: 0});
     *      resetToDefault({x: 5, y: 2}); //=> {x: 0, y: 2}
     */
    var merge = _curry2(function merge(l, r) {
        return _assign({}, l, r);
    });

    /**
     * Merges a list of objects together into one object.
     *
     * @func
     * @memberOf R
     * @since v0.10.0
     * @category List
     * @sig [{k: v}] -> {k: v}
     * @param {Array} list An array of objects
     * @return {Object} A merged object.
     * @see R.reduce
     * @example
     *
     *      R.mergeAll([{foo:1},{bar:2},{baz:3}]); //=> {foo:1,bar:2,baz:3}
     *      R.mergeAll([{foo:1},{foo:2},{bar:2}]); //=> {foo:2,bar:2}
     */
    var mergeAll = _curry1(function mergeAll(list) {
        return _assign.apply(null, [{}].concat(list));
    });

    /**
     * Creates a new object with the own properties of the two provided objects. If
     * a key exists in both objects, the provided function is applied to the key
     * and the values associated with the key in each object, with the result being
     * used as the value associated with the key in the returned object. The key
     * will be excluded from the returned object if the resulting value is
     * `undefined`.
     *
     * @func
     * @memberOf R
     * @since v0.19.0
     * @category Object
     * @sig (String -> a -> a -> a) -> {a} -> {a} -> {a}
     * @param {Function} fn
     * @param {Object} l
     * @param {Object} r
     * @return {Object}
     * @see R.merge, R.mergeWith
     * @example
     *
     *      let concatValues = (k, l, r) => k == 'values' ? R.concat(l, r) : r
     *      R.mergeWithKey(concatValues,
     *                     { a: true, thing: 'foo', values: [10, 20] },
     *                     { b: true, thing: 'bar', values: [15, 35] });
     *      //=> { a: true, b: true, thing: 'bar', values: [10, 20, 15, 35] }
     */
    var mergeWithKey = _curry3(function mergeWithKey(fn, l, r) {
        var result = {};
        var k;
        for (k in l) {
            if (_has(k, l)) {
                result[k] = _has(k, r) ? fn(k, l[k], r[k]) : l[k];
            }
        }
        for (k in r) {
            if (_has(k, r) && !_has(k, result)) {
                result[k] = r[k];
            }
        }
        return result;
    });

    /**
     * Returns the smaller of its two arguments.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Relation
     * @sig Ord a => a -> a -> a
     * @param {*} a
     * @param {*} b
     * @return {*}
     * @see R.minBy, R.max
     * @example
     *
     *      R.min(789, 123); //=> 123
     *      R.min('a', 'b'); //=> 'a'
     */
    var min = _curry2(function min(a, b) {
        return b < a ? b : a;
    });

    /**
     * Takes a function and two values, and returns whichever value produces the
     * smaller result when passed to the provided function.
     *
     * @func
     * @memberOf R
     * @since v0.8.0
     * @category Relation
     * @sig Ord b => (a -> b) -> a -> a -> a
     * @param {Function} f
     * @param {*} a
     * @param {*} b
     * @return {*}
     * @see R.min, R.maxBy
     * @example
     *
     *      //  square :: Number -> Number
     *      var square = n => n * n;
     *
     *      R.minBy(square, -3, 2); //=> 2
     *
     *      R.reduce(R.minBy(square), Infinity, [3, -5, 4, 1, -2]); //=> 1
     *      R.reduce(R.minBy(square), Infinity, []); //=> Infinity
     */
    var minBy = _curry3(function minBy(f, a, b) {
        return f(b) < f(a) ? b : a;
    });

    /**
     * Divides the first parameter by the second and returns the remainder. Note
     * that this function preserves the JavaScript-style behavior for modulo. For
     * mathematical modulo see `mathMod`.
     *
     * @func
     * @memberOf R
     * @since v0.1.1
     * @category Math
     * @sig Number -> Number -> Number
     * @param {Number} a The value to the divide.
     * @param {Number} b The pseudo-modulus
     * @return {Number} The result of `b % a`.
     * @see R.mathMod
     * @example
     *
     *      R.modulo(17, 3); //=> 2
     *      // JS behavior:
     *      R.modulo(-17, 3); //=> -2
     *      R.modulo(17, -3); //=> 2
     *
     *      var isOdd = R.modulo(R.__, 2);
     *      isOdd(42); //=> 0
     *      isOdd(21); //=> 1
     */
    var modulo = _curry2(function modulo(a, b) {
        return a % b;
    });

    /**
     * Multiplies two numbers. Equivalent to `a * b` but curried.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Math
     * @sig Number -> Number -> Number
     * @param {Number} a The first value.
     * @param {Number} b The second value.
     * @return {Number} The result of `a * b`.
     * @see R.divide
     * @example
     *
     *      var double = R.multiply(2);
     *      var triple = R.multiply(3);
     *      double(3);       //=>  6
     *      triple(4);       //=> 12
     *      R.multiply(2, 5);  //=> 10
     */
    var multiply = _curry2(function multiply(a, b) {
        return a * b;
    });

    /**
     * Wraps a function of any arity (including nullary) in a function that accepts
     * exactly `n` parameters. Any extraneous parameters will not be passed to the
     * supplied function.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Function
     * @sig Number -> (* -> a) -> (* -> a)
     * @param {Number} n The desired arity of the new function.
     * @param {Function} fn The function to wrap.
     * @return {Function} A new function wrapping `fn`. The new function is guaranteed to be of
     *         arity `n`.
     * @example
     *
     *      var takesTwoArgs = (a, b) => [a, b];
     *
     *      takesTwoArgs.length; //=> 2
     *      takesTwoArgs(1, 2); //=> [1, 2]
     *
     *      var takesOneArg = R.nAry(1, takesTwoArgs);
     *      takesOneArg.length; //=> 1
     *      // Only `n` arguments are passed to the wrapped function
     *      takesOneArg(1, 2); //=> [1, undefined]
     */
    var nAry = _curry2(function nAry(n, fn) {
        switch (n) {
        case 0:
            return function () {
                return fn.call(this);
            };
        case 1:
            return function (a0) {
                return fn.call(this, a0);
            };
        case 2:
            return function (a0, a1) {
                return fn.call(this, a0, a1);
            };
        case 3:
            return function (a0, a1, a2) {
                return fn.call(this, a0, a1, a2);
            };
        case 4:
            return function (a0, a1, a2, a3) {
                return fn.call(this, a0, a1, a2, a3);
            };
        case 5:
            return function (a0, a1, a2, a3, a4) {
                return fn.call(this, a0, a1, a2, a3, a4);
            };
        case 6:
            return function (a0, a1, a2, a3, a4, a5) {
                return fn.call(this, a0, a1, a2, a3, a4, a5);
            };
        case 7:
            return function (a0, a1, a2, a3, a4, a5, a6) {
                return fn.call(this, a0, a1, a2, a3, a4, a5, a6);
            };
        case 8:
            return function (a0, a1, a2, a3, a4, a5, a6, a7) {
                return fn.call(this, a0, a1, a2, a3, a4, a5, a6, a7);
            };
        case 9:
            return function (a0, a1, a2, a3, a4, a5, a6, a7, a8) {
                return fn.call(this, a0, a1, a2, a3, a4, a5, a6, a7, a8);
            };
        case 10:
            return function (a0, a1, a2, a3, a4, a5, a6, a7, a8, a9) {
                return fn.call(this, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9);
            };
        default:
            throw new Error('First argument to nAry must be a non-negative integer no greater than ten');
        }
    });

    /**
     * Negates its argument.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category Math
     * @sig Number -> Number
     * @param {Number} n
     * @return {Number}
     * @example
     *
     *      R.negate(42); //=> -42
     */
    var negate = _curry1(function negate(n) {
        return -n;
    });

    /**
     * Returns `true` if no elements of the list match the predicate, `false`
     * otherwise.
     *
     * Dispatches to the `any` method of the second argument, if present.
     *
     * @func
     * @memberOf R
     * @since v0.12.0
     * @category List
     * @sig (a -> Boolean) -> [a] -> Boolean
     * @param {Function} fn The predicate function.
     * @param {Array} list The array to consider.
     * @return {Boolean} `true` if the predicate is not satisfied by every element, `false` otherwise.
     * @see R.all, R.any
     * @example
     *
     *      var isEven = n => n % 2 === 0;
     *
     *      R.none(isEven, [1, 3, 5, 7, 9, 11]); //=> true
     *      R.none(isEven, [1, 3, 5, 7, 8, 11]); //=> false
     */
    var none = _curry2(_complement(_dispatchable('any', _xany, any)));

    /**
     * A function that returns the `!` of its argument. It will return `true` when
     * passed false-y value, and `false` when passed a truth-y one.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Logic
     * @sig * -> Boolean
     * @param {*} a any value
     * @return {Boolean} the logical inverse of passed argument.
     * @see R.complement
     * @example
     *
     *      R.not(true); //=> false
     *      R.not(false); //=> true
     *      R.not(0); //=> true
     *      R.not(1); //=> false
     */
    var not = _curry1(function not(a) {
        return !a;
    });

    /**
     * Returns the nth element of the given list or string. If n is negative the
     * element at index length + n is returned.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig Number -> [a] -> a | Undefined
     * @sig Number -> String -> String
     * @param {Number} offset
     * @param {*} list
     * @return {*}
     * @example
     *
     *      var list = ['foo', 'bar', 'baz', 'quux'];
     *      R.nth(1, list); //=> 'bar'
     *      R.nth(-1, list); //=> 'quux'
     *      R.nth(-99, list); //=> undefined
     *
     *      R.nth(2, 'abc'); //=> 'c'
     *      R.nth(3, 'abc'); //=> ''
     */
    var nth = _curry2(function nth(offset, list) {
        var idx = offset < 0 ? list.length + offset : offset;
        return _isString(list) ? list.charAt(idx) : list[idx];
    });

    /**
     * Returns a function which returns its nth argument.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category Function
     * @sig Number -> *... -> *
     * @param {Number} n
     * @return {Function}
     * @example
     *
     *      R.nthArg(1)('a', 'b', 'c'); //=> 'b'
     *      R.nthArg(-1)('a', 'b', 'c'); //=> 'c'
     */
    var nthArg = _curry1(function nthArg(n) {
        var arity = n < 0 ? 1 : n + 1;
        return curryN(arity, function () {
            return nth(n, arguments);
        });
    });

    /**
     * Creates an object containing a single key:value pair.
     *
     * @func
     * @memberOf R
     * @since v0.18.0
     * @category Object
     * @sig String -> a -> {String:a}
     * @param {String} key
     * @param {*} val
     * @return {Object}
     * @see R.pair
     * @example
     *
     *      var matchPhrases = R.compose(
     *        R.objOf('must'),
     *        R.map(R.objOf('match_phrase'))
     *      );
     *      matchPhrases(['foo', 'bar', 'baz']); //=> {must: [{match_phrase: 'foo'}, {match_phrase: 'bar'}, {match_phrase: 'baz'}]}
     */
    var objOf = _curry2(function objOf(key, val) {
        var obj = {};
        obj[key] = val;
        return obj;
    });

    /**
     * Returns a singleton array containing the value provided.
     *
     * Note this `of` is different from the ES6 `of`; See
     * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/of
     *
     * @func
     * @memberOf R
     * @since v0.3.0
     * @category Function
     * @sig a -> [a]
     * @param {*} x any value
     * @return {Array} An array wrapping `x`.
     * @example
     *
     *      R.of(null); //=> [null]
     *      R.of([42]); //=> [[42]]
     */
    var of = _curry1(_of);

    /**
     * Accepts a function `fn` and returns a function that guards invocation of
     * `fn` such that `fn` can only ever be called once, no matter how many times
     * the returned function is invoked. The first value calculated is returned in
     * subsequent invocations.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Function
     * @sig (a... -> b) -> (a... -> b)
     * @param {Function} fn The function to wrap in a call-only-once wrapper.
     * @return {Function} The wrapped function.
     * @example
     *
     *      var addOneOnce = R.once(x => x + 1);
     *      addOneOnce(10); //=> 11
     *      addOneOnce(addOneOnce(50)); //=> 11
     */
    var once = _curry1(function once(fn) {
        var called = false;
        var result;
        return _arity(fn.length, function () {
            if (called) {
                return result;
            }
            called = true;
            result = fn.apply(this, arguments);
            return result;
        });
    });

    /**
     * Returns `true` if one or both of its arguments are `true`. Returns `false`
     * if both arguments are `false`.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Logic
     * @sig * -> * -> *
     * @param {Boolean} a A boolean value
     * @param {Boolean} b A boolean value
     * @return {Boolean} `true` if one or both arguments are `true`, `false` otherwise
     * @see R.either
     * @example
     *
     *      R.or(true, true); //=> true
     *      R.or(true, false); //=> true
     *      R.or(false, true); //=> true
     *      R.or(false, false); //=> false
     */
    var or = _curry2(function or(a, b) {
        return a || b;
    });

    /**
     * Returns the result of "setting" the portion of the given data structure
     * focused by the given lens to the result of applying the given function to
     * the focused value.
     *
     * @func
     * @memberOf R
     * @since v0.16.0
     * @category Object
     * @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
     * @sig Lens s a -> (a -> a) -> s -> s
     * @param {Lens} lens
     * @param {*} v
     * @param {*} x
     * @return {*}
     * @see R.prop, R.lensIndex, R.lensProp
     * @example
     *
     *      var headLens = R.lensIndex(0);
     *
     *      R.over(headLens, R.toUpper, ['foo', 'bar', 'baz']); //=> ['FOO', 'bar', 'baz']
     */
    // `Identity` is a functor that holds a single value, where `map` simply
    // transforms the held value with the provided function.
    // The value returned by the getter function is first transformed with `f`,
    // then set as the value of an `Identity`. This is then mapped over with the
    // setter function of the lens.
    var over = function () {
        // `Identity` is a functor that holds a single value, where `map` simply
        // transforms the held value with the provided function.
        var Identity = function (x) {
            return {
                value: x,
                map: function (f) {
                    return Identity(f(x));
                }
            };
        };
        return _curry3(function over(lens, f, x) {
            // The value returned by the getter function is first transformed with `f`,
            // then set as the value of an `Identity`. This is then mapped over with the
            // setter function of the lens.
            return lens(function (y) {
                return Identity(f(y));
            })(x).value;
        });
    }();

    /**
     * Takes two arguments, `fst` and `snd`, and returns `[fst, snd]`.
     *
     * @func
     * @memberOf R
     * @since v0.18.0
     * @category List
     * @sig a -> b -> (a,b)
     * @param {*} fst
     * @param {*} snd
     * @return {Array}
     * @see R.objOf, R.of
     * @example
     *
     *      R.pair('foo', 'bar'); //=> ['foo', 'bar']
     */
    var pair = _curry2(function pair(fst, snd) {
        return [
            fst,
            snd
        ];
    });

    /**
     * Retrieve the value at a given path.
     *
     * @func
     * @memberOf R
     * @since v0.2.0
     * @category Object
     * @sig [String] -> {k: v} -> v | Undefined
     * @param {Array} path The path to use.
     * @param {Object} obj The object to retrieve the nested property from.
     * @return {*} The data at `path`.
     * @see R.prop
     * @example
     *
     *      R.path(['a', 'b'], {a: {b: 2}}); //=> 2
     *      R.path(['a', 'b'], {c: {b: 2}}); //=> undefined
     */
    var path = _curry2(function path(paths, obj) {
        var val = obj;
        var idx = 0;
        while (idx < paths.length) {
            if (val == null) {
                return;
            }
            val = val[paths[idx]];
            idx += 1;
        }
        return val;
    });

    /**
     * If the given, non-null object has a value at the given path, returns the
     * value at that path. Otherwise returns the provided default value.
     *
     * @func
     * @memberOf R
     * @since v0.18.0
     * @category Object
     * @sig a -> [String] -> Object -> a
     * @param {*} d The default value.
     * @param {Array} p The path to use.
     * @param {Object} obj The object to retrieve the nested property from.
     * @return {*} The data at `path` of the supplied object or the default value.
     * @example
     *
     *      R.pathOr('N/A', ['a', 'b'], {a: {b: 2}}); //=> 2
     *      R.pathOr('N/A', ['a', 'b'], {c: {b: 2}}); //=> "N/A"
     */
    var pathOr = _curry3(function pathOr(d, p, obj) {
        return defaultTo(d, path(p, obj));
    });

    /**
     * Returns `true` if the specified object property at given path satisfies the
     * given predicate; `false` otherwise.
     *
     * @func
     * @memberOf R
     * @since v0.19.0
     * @category Logic
     * @sig (a -> Boolean) -> [String] -> Object -> Boolean
     * @param {Function} pred
     * @param {Array} propPath
     * @param {*} obj
     * @return {Boolean}
     * @see R.propSatisfies, R.path
     * @example
     *
     *      R.pathSatisfies(y => y > 0, ['x', 'y'], {x: {y: 2}}); //=> true
     */
    var pathSatisfies = _curry3(function pathSatisfies(pred, propPath, obj) {
        return propPath.length > 0 && pred(path(propPath, obj));
    });

    /**
     * Returns a partial copy of an object containing only the keys specified. If
     * the key does not exist, the property is ignored.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Object
     * @sig [k] -> {k: v} -> {k: v}
     * @param {Array} names an array of String property names to copy onto a new object
     * @param {Object} obj The object to copy from
     * @return {Object} A new object with only properties from `names` on it.
     * @see R.omit, R.props
     * @example
     *
     *      R.pick(['a', 'd'], {a: 1, b: 2, c: 3, d: 4}); //=> {a: 1, d: 4}
     *      R.pick(['a', 'e', 'f'], {a: 1, b: 2, c: 3, d: 4}); //=> {a: 1}
     */
    var pick = _curry2(function pick(names, obj) {
        var result = {};
        var idx = 0;
        while (idx < names.length) {
            if (names[idx] in obj) {
                result[names[idx]] = obj[names[idx]];
            }
            idx += 1;
        }
        return result;
    });

    /**
     * Similar to `pick` except that this one includes a `key: undefined` pair for
     * properties that don't exist.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Object
     * @sig [k] -> {k: v} -> {k: v}
     * @param {Array} names an array of String property names to copy onto a new object
     * @param {Object} obj The object to copy from
     * @return {Object} A new object with only properties from `names` on it.
     * @see R.pick
     * @example
     *
     *      R.pickAll(['a', 'd'], {a: 1, b: 2, c: 3, d: 4}); //=> {a: 1, d: 4}
     *      R.pickAll(['a', 'e', 'f'], {a: 1, b: 2, c: 3, d: 4}); //=> {a: 1, e: undefined, f: undefined}
     */
    var pickAll = _curry2(function pickAll(names, obj) {
        var result = {};
        var idx = 0;
        var len = names.length;
        while (idx < len) {
            var name = names[idx];
            result[name] = obj[name];
            idx += 1;
        }
        return result;
    });

    /**
     * Returns a partial copy of an object containing only the keys that satisfy
     * the supplied predicate.
     *
     * @func
     * @memberOf R
     * @since v0.8.0
     * @category Object
     * @sig (v, k -> Boolean) -> {k: v} -> {k: v}
     * @param {Function} pred A predicate to determine whether or not a key
     *        should be included on the output object.
     * @param {Object} obj The object to copy from
     * @return {Object} A new object with only properties that satisfy `pred`
     *         on it.
     * @see R.pick, R.filter
     * @example
     *
     *      var isUpperCase = (val, key) => key.toUpperCase() === key;
     *      R.pickBy(isUpperCase, {a: 1, b: 2, A: 3, B: 4}); //=> {A: 3, B: 4}
     */
    var pickBy = _curry2(function pickBy(test, obj) {
        var result = {};
        for (var prop in obj) {
            if (test(obj[prop], prop, obj)) {
                result[prop] = obj[prop];
            }
        }
        return result;
    });

    /**
     * Returns a new list with the given element at the front, followed by the
     * contents of the list.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig a -> [a] -> [a]
     * @param {*} el The item to add to the head of the output list.
     * @param {Array} list The array to add to the tail of the output list.
     * @return {Array} A new array.
     * @see R.append
     * @example
     *
     *      R.prepend('fee', ['fi', 'fo', 'fum']); //=> ['fee', 'fi', 'fo', 'fum']
     */
    var prepend = _curry2(function prepend(el, list) {
        return _concat([el], list);
    });

    /**
     * Returns a function that when supplied an object returns the indicated
     * property of that object, if it exists.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Object
     * @sig s -> {s: a} -> a | Undefined
     * @param {String} p The property name
     * @param {Object} obj The object to query
     * @return {*} The value at `obj.p`.
     * @see R.path
     * @example
     *
     *      R.prop('x', {x: 100}); //=> 100
     *      R.prop('x', {}); //=> undefined
     */
    var prop = _curry2(function prop(p, obj) {
        return obj[p];
    });

    /**
     * Returns `true` if the specified object property is of the given type;
     * `false` otherwise.
     *
     * @func
     * @memberOf R
     * @since v0.16.0
     * @category Type
     * @sig Type -> String -> Object -> Boolean
     * @param {Function} type
     * @param {String} name
     * @param {*} obj
     * @return {Boolean}
     * @see R.is, R.propSatisfies
     * @example
     *
     *      R.propIs(Number, 'x', {x: 1, y: 2});  //=> true
     *      R.propIs(Number, 'x', {x: 'foo'});    //=> false
     *      R.propIs(Number, 'x', {});            //=> false
     */
    var propIs = _curry3(function propIs(type, name, obj) {
        return is(type, obj[name]);
    });

    /**
     * If the given, non-null object has an own property with the specified name,
     * returns the value of that property. Otherwise returns the provided default
     * value.
     *
     * @func
     * @memberOf R
     * @since v0.6.0
     * @category Object
     * @sig a -> String -> Object -> a
     * @param {*} val The default value.
     * @param {String} p The name of the property to return.
     * @param {Object} obj The object to query.
     * @return {*} The value of given property of the supplied object or the default value.
     * @example
     *
     *      var alice = {
     *        name: 'ALICE',
     *        age: 101
     *      };
     *      var favorite = R.prop('favoriteLibrary');
     *      var favoriteWithDefault = R.propOr('Ramda', 'favoriteLibrary');
     *
     *      favorite(alice);  //=> undefined
     *      favoriteWithDefault(alice);  //=> 'Ramda'
     */
    var propOr = _curry3(function propOr(val, p, obj) {
        return obj != null && _has(p, obj) ? obj[p] : val;
    });

    /**
     * Returns `true` if the specified object property satisfies the given
     * predicate; `false` otherwise.
     *
     * @func
     * @memberOf R
     * @since v0.16.0
     * @category Logic
     * @sig (a -> Boolean) -> String -> {String: a} -> Boolean
     * @param {Function} pred
     * @param {String} name
     * @param {*} obj
     * @return {Boolean}
     * @see R.propEq, R.propIs
     * @example
     *
     *      R.propSatisfies(x => x > 0, 'x', {x: 1, y: 2}); //=> true
     */
    var propSatisfies = _curry3(function propSatisfies(pred, name, obj) {
        return pred(obj[name]);
    });

    /**
     * Acts as multiple `prop`: array of keys in, array of values out. Preserves
     * order.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Object
     * @sig [k] -> {k: v} -> [v]
     * @param {Array} ps The property names to fetch
     * @param {Object} obj The object to query
     * @return {Array} The corresponding values or partially applied function.
     * @example
     *
     *      R.props(['x', 'y'], {x: 1, y: 2}); //=> [1, 2]
     *      R.props(['c', 'a', 'b'], {b: 2, a: 1}); //=> [undefined, 1, 2]
     *
     *      var fullName = R.compose(R.join(' '), R.props(['first', 'last']));
     *      fullName({last: 'Bullet-Tooth', age: 33, first: 'Tony'}); //=> 'Tony Bullet-Tooth'
     */
    var props = _curry2(function props(ps, obj) {
        var len = ps.length;
        var out = [];
        var idx = 0;
        while (idx < len) {
            out[idx] = obj[ps[idx]];
            idx += 1;
        }
        return out;
    });

    /**
     * Returns a list of numbers from `from` (inclusive) to `to` (exclusive).
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig Number -> Number -> [Number]
     * @param {Number} from The first number in the list.
     * @param {Number} to One more than the last number in the list.
     * @return {Array} The list of numbers in tthe set `[a, b)`.
     * @example
     *
     *      R.range(1, 5);    //=> [1, 2, 3, 4]
     *      R.range(50, 53);  //=> [50, 51, 52]
     */
    var range = _curry2(function range(from, to) {
        if (!(_isNumber(from) && _isNumber(to))) {
            throw new TypeError('Both arguments to range must be numbers');
        }
        var result = [];
        var n = from;
        while (n < to) {
            result.push(n);
            n += 1;
        }
        return result;
    });

    /**
     * Returns a single item by iterating through the list, successively calling
     * the iterator function and passing it an accumulator value and the current
     * value from the array, and then passing the result to the next call.
     *
     * Similar to `reduce`, except moves through the input list from the right to
     * the left.
     *
     * The iterator function receives two values: *(acc, value)*
     *
     * Note: `R.reduceRight` does not skip deleted or unassigned indices (sparse
     * arrays), unlike the native `Array.prototype.reduce` method. For more details
     * on this behavior, see:
     * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduceRight#Description
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig (a,b -> a) -> a -> [b] -> a
     * @param {Function} fn The iterator function. Receives two values, the accumulator and the
     *        current element from the array.
     * @param {*} acc The accumulator value.
     * @param {Array} list The list to iterate over.
     * @return {*} The final, accumulated value.
     * @see R.addIndex
     * @example
     *
     *      var pairs = [ ['a', 1], ['b', 2], ['c', 3] ];
     *      var flattenPairs = (acc, pair) => acc.concat(pair);
     *
     *      R.reduceRight(flattenPairs, [], pairs); //=> [ 'c', 3, 'b', 2, 'a', 1 ]
     */
    var reduceRight = _curry3(function reduceRight(fn, acc, list) {
        var idx = list.length - 1;
        while (idx >= 0) {
            acc = fn(acc, list[idx]);
            idx -= 1;
        }
        return acc;
    });

    /**
     * Returns a value wrapped to indicate that it is the final value of the reduce
     * and transduce functions. The returned value should be considered a black
     * box: the internal structure is not guaranteed to be stable.
     *
     * Note: this optimization is unavailable to functions not explicitly listed
     * above. For instance, it is not currently supported by reduceRight.
     *
     * @func
     * @memberOf R
     * @since v0.15.0
     * @category List
     * @sig a -> *
     * @param {*} x The final value of the reduce.
     * @return {*} The wrapped value.
     * @see R.reduce, R.transduce
     * @example
     *
     *      R.reduce(
     *        R.pipe(R.add, R.when(R.gte(R.__, 10), R.reduced)),
     *        0,
     *        [1, 2, 3, 4, 5]) // 10
     */
    var reduced = _curry1(_reduced);

    /**
     * Removes the sub-list of `list` starting at index `start` and containing
     * `count` elements. _Note that this is not destructive_: it returns a copy of
     * the list with the changes.
     * <small>No lists have been harmed in the application of this function.</small>
     *
     * @func
     * @memberOf R
     * @since v0.2.2
     * @category List
     * @sig Number -> Number -> [a] -> [a]
     * @param {Number} start The position to start removing elements
     * @param {Number} count The number of elements to remove
     * @param {Array} list The list to remove from
     * @return {Array} A new Array with `count` elements from `start` removed.
     * @example
     *
     *      R.remove(2, 3, [1,2,3,4,5,6,7,8]); //=> [1,2,6,7,8]
     */
    var remove = _curry3(function remove(start, count, list) {
        return _concat(_slice(list, 0, Math.min(start, list.length)), _slice(list, Math.min(list.length, start + count)));
    });

    /**
     * Replace a substring or regex match in a string with a replacement.
     *
     * @func
     * @memberOf R
     * @since v0.7.0
     * @category String
     * @sig RegExp|String -> String -> String -> String
     * @param {RegExp|String} pattern A regular expression or a substring to match.
     * @param {String} replacement The string to replace the matches with.
     * @param {String} str The String to do the search and replacement in.
     * @return {String} The result.
     * @example
     *
     *      R.replace('foo', 'bar', 'foo foo foo'); //=> 'bar foo foo'
     *      R.replace(/foo/, 'bar', 'foo foo foo'); //=> 'bar foo foo'
     *
     *      // Use the "g" (global) flag to replace all occurrences:
     *      R.replace(/foo/g, 'bar', 'foo foo foo'); //=> 'bar bar bar'
     */
    var replace = _curry3(function replace(regex, replacement, str) {
        return str.replace(regex, replacement);
    });

    /**
     * Returns a new list or string with the elements or characters in reverse
     * order.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig [a] -> [a]
     * @sig String -> String
     * @param {Array|String} list
     * @return {Array|String}
     * @example
     *
     *      R.reverse([1, 2, 3]);  //=> [3, 2, 1]
     *      R.reverse([1, 2]);     //=> [2, 1]
     *      R.reverse([1]);        //=> [1]
     *      R.reverse([]);         //=> []
     *
     *      R.reverse('abc');      //=> 'cba'
     *      R.reverse('ab');       //=> 'ba'
     *      R.reverse('a');        //=> 'a'
     *      R.reverse('');         //=> ''
     */
    var reverse = _curry1(function reverse(list) {
        return _isString(list) ? list.split('').reverse().join('') : _slice(list).reverse();
    });

    /**
     * Scan is similar to reduce, but returns a list of successively reduced values
     * from the left
     *
     * @func
     * @memberOf R
     * @since v0.10.0
     * @category List
     * @sig (a,b -> a) -> a -> [b] -> [a]
     * @param {Function} fn The iterator function. Receives two values, the accumulator and the
     *        current element from the array
     * @param {*} acc The accumulator value.
     * @param {Array} list The list to iterate over.
     * @return {Array} A list of all intermediately reduced values.
     * @example
     *
     *      var numbers = [1, 2, 3, 4];
     *      var factorials = R.scan(R.multiply, 1, numbers); //=> [1, 1, 2, 6, 24]
     */
    var scan = _curry3(function scan(fn, acc, list) {
        var idx = 0;
        var len = list.length;
        var result = [acc];
        while (idx < len) {
            acc = fn(acc, list[idx]);
            result[idx + 1] = acc;
            idx += 1;
        }
        return result;
    });

    /**
     * Returns the result of "setting" the portion of the given data structure
     * focused by the given lens to the given value.
     *
     * @func
     * @memberOf R
     * @since v0.16.0
     * @category Object
     * @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
     * @sig Lens s a -> a -> s -> s
     * @param {Lens} lens
     * @param {*} v
     * @param {*} x
     * @return {*}
     * @see R.prop, R.lensIndex, R.lensProp
     * @example
     *
     *      var xLens = R.lensProp('x');
     *
     *      R.set(xLens, 4, {x: 1, y: 2});  //=> {x: 4, y: 2}
     *      R.set(xLens, 8, {x: 1, y: 2});  //=> {x: 8, y: 2}
     */
    var set = _curry3(function set(lens, v, x) {
        return over(lens, always(v), x);
    });

    /**
     * Returns the elements of the given list or string (or object with a `slice`
     * method) from `fromIndex` (inclusive) to `toIndex` (exclusive).
     *
     * Dispatches to the `slice` method of the third argument, if present.
     *
     * @func
     * @memberOf R
     * @since v0.1.4
     * @category List
     * @sig Number -> Number -> [a] -> [a]
     * @sig Number -> Number -> String -> String
     * @param {Number} fromIndex The start index (inclusive).
     * @param {Number} toIndex The end index (exclusive).
     * @param {*} list
     * @return {*}
     * @example
     *
     *      R.slice(1, 3, ['a', 'b', 'c', 'd']);        //=> ['b', 'c']
     *      R.slice(1, Infinity, ['a', 'b', 'c', 'd']); //=> ['b', 'c', 'd']
     *      R.slice(0, -1, ['a', 'b', 'c', 'd']);       //=> ['a', 'b', 'c']
     *      R.slice(-3, -1, ['a', 'b', 'c', 'd']);      //=> ['b', 'c']
     *      R.slice(0, 3, 'ramda');                     //=> 'ram'
     */
    var slice = _curry3(_checkForMethod('slice', function slice(fromIndex, toIndex, list) {
        return Array.prototype.slice.call(list, fromIndex, toIndex);
    }));

    /**
     * Returns a copy of the list, sorted according to the comparator function,
     * which should accept two values at a time and return a negative number if the
     * first value is smaller, a positive number if it's larger, and zero if they
     * are equal. Please note that this is a **copy** of the list. It does not
     * modify the original.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig (a,a -> Number) -> [a] -> [a]
     * @param {Function} comparator A sorting function :: a -> b -> Int
     * @param {Array} list The list to sort
     * @return {Array} a new array with its elements sorted by the comparator function.
     * @example
     *
     *      var diff = function(a, b) { return a - b; };
     *      R.sort(diff, [4,2,7,5]); //=> [2, 4, 5, 7]
     */
    var sort = _curry2(function sort(comparator, list) {
        return _slice(list).sort(comparator);
    });

    /**
     * Sorts the list according to the supplied function.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Relation
     * @sig Ord b => (a -> b) -> [a] -> [a]
     * @param {Function} fn
     * @param {Array} list The list to sort.
     * @return {Array} A new list sorted by the keys generated by `fn`.
     * @example
     *
     *      var sortByFirstItem = R.sortBy(R.prop(0));
     *      var sortByNameCaseInsensitive = R.sortBy(R.compose(R.toLower, R.prop('name')));
     *      var pairs = [[-1, 1], [-2, 2], [-3, 3]];
     *      sortByFirstItem(pairs); //=> [[-3, 3], [-2, 2], [-1, 1]]
     *      var alice = {
     *        name: 'ALICE',
     *        age: 101
     *      };
     *      var bob = {
     *        name: 'Bob',
     *        age: -10
     *      };
     *      var clara = {
     *        name: 'clara',
     *        age: 314.159
     *      };
     *      var people = [clara, bob, alice];
     *      sortByNameCaseInsensitive(people); //=> [alice, bob, clara]
     */
    var sortBy = _curry2(function sortBy(fn, list) {
        return _slice(list).sort(function (a, b) {
            var aa = fn(a);
            var bb = fn(b);
            return aa < bb ? -1 : aa > bb ? 1 : 0;
        });
    });

    /**
     * Splits a given list or string at a given index.
     *
     * @func
     * @memberOf R
     * @since v0.19.0
     * @category List
     * @sig Number -> [a] -> [[a], [a]]
     * @sig Number -> String -> [String, String]
     * @param {Number} index The index where the array/string is split.
     * @param {Array|String} array The array/string to be split.
     * @return {Array}
     * @example
     *
     *      R.splitAt(1, [1, 2, 3]);          //=> [[1], [2, 3]]
     *      R.splitAt(5, 'hello world');      //=> ['hello', ' world']
     *      R.splitAt(-1, 'foobar');          //=> ['fooba', 'r']
     */
    var splitAt = _curry2(function splitAt(index, array) {
        return [
            slice(0, index, array),
            slice(index, length(array), array)
        ];
    });

    /**
     * Splits a collection into slices of the specified length.
     *
     * @func
     * @memberOf R
     * @since v0.16.0
     * @category List
     * @sig Number -> [a] -> [[a]]
     * @sig Number -> String -> [String]
     * @param {Number} n
     * @param {Array} list
     * @return {Array}
     * @example
     *
     *      R.splitEvery(3, [1, 2, 3, 4, 5, 6, 7]); //=> [[1, 2, 3], [4, 5, 6], [7]]
     *      R.splitEvery(3, 'foobarbaz'); //=> ['foo', 'bar', 'baz']
     */
    var splitEvery = _curry2(function splitEvery(n, list) {
        if (n <= 0) {
            throw new Error('First argument to splitEvery must be a positive integer');
        }
        var result = [];
        var idx = 0;
        while (idx < list.length) {
            result.push(slice(idx, idx += n, list));
        }
        return result;
    });

    /**
     * Takes a list and a predicate and returns a pair of lists with the following properties:
     *
     *  - the result of concatenating the two output lists is equivalent to the input list;
     *  - none of the elements of the first output list satisfies the predicate; and
     *  - if the second output list is non-empty, its first element satisfies the predicate.
     *
     * @func
     * @memberOf R
     * @since v0.19.0
     * @category List
     * @sig (a -> Boolean) -> [a] -> [[a], [a]]
     * @param {Function} pred The predicate that determines where the array is split.
     * @param {Array} list The array to be split.
     * @return {Array}
     * @example
     *
     *      R.splitWhen(R.equals(2), [1, 2, 3, 1, 2, 3]);   //=> [[1], [2, 3, 1, 2, 3]]
     */
    var splitWhen = _curry2(function splitWhen(pred, list) {
        var idx = 0;
        var len = list.length;
        var prefix = [];
        while (idx < len && !pred(list[idx])) {
            prefix.push(list[idx]);
            idx += 1;
        }
        return [
            prefix,
            _slice(list, idx)
        ];
    });

    /**
     * Subtracts its second argument from its first argument.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Math
     * @sig Number -> Number -> Number
     * @param {Number} a The first value.
     * @param {Number} b The second value.
     * @return {Number} The result of `a - b`.
     * @see R.add
     * @example
     *
     *      R.subtract(10, 8); //=> 2
     *
     *      var minus5 = R.subtract(R.__, 5);
     *      minus5(17); //=> 12
     *
     *      var complementaryAngle = R.subtract(90);
     *      complementaryAngle(30); //=> 60
     *      complementaryAngle(72); //=> 18
     */
    var subtract = _curry2(function subtract(a, b) {
        return Number(a) - Number(b);
    });

    /**
     * Returns all but the first element of the given list or string (or object
     * with a `tail` method).
     *
     * Dispatches to the `slice` method of the first argument, if present.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig [a] -> [a]
     * @sig String -> String
     * @param {*} list
     * @return {*}
     * @see R.head, R.init, R.last
     * @example
     *
     *      R.tail([1, 2, 3]);  //=> [2, 3]
     *      R.tail([1, 2]);     //=> [2]
     *      R.tail([1]);        //=> []
     *      R.tail([]);         //=> []
     *
     *      R.tail('abc');  //=> 'bc'
     *      R.tail('ab');   //=> 'b'
     *      R.tail('a');    //=> ''
     *      R.tail('');     //=> ''
     */
    var tail = _checkForMethod('tail', slice(1, Infinity));

    /**
     * Returns the first `n` elements of the given list, string, or
     * transducer/transformer (or object with a `take` method).
     *
     * Dispatches to the `take` method of the second argument, if present.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig Number -> [a] -> [a]
     * @sig Number -> String -> String
     * @param {Number} n
     * @param {*} list
     * @return {*}
     * @see R.drop
     * @example
     *
     *      R.take(1, ['foo', 'bar', 'baz']); //=> ['foo']
     *      R.take(2, ['foo', 'bar', 'baz']); //=> ['foo', 'bar']
     *      R.take(3, ['foo', 'bar', 'baz']); //=> ['foo', 'bar', 'baz']
     *      R.take(4, ['foo', 'bar', 'baz']); //=> ['foo', 'bar', 'baz']
     *      R.take(3, 'ramda');               //=> 'ram'
     *
     *      var personnel = [
     *        'Dave Brubeck',
     *        'Paul Desmond',
     *        'Eugene Wright',
     *        'Joe Morello',
     *        'Gerry Mulligan',
     *        'Bob Bates',
     *        'Joe Dodge',
     *        'Ron Crotty'
     *      ];
     *
     *      var takeFive = R.take(5);
     *      takeFive(personnel);
     *      //=> ['Dave Brubeck', 'Paul Desmond', 'Eugene Wright', 'Joe Morello', 'Gerry Mulligan']
     */
    var take = _curry2(_dispatchable('take', _xtake, function take(n, xs) {
        return slice(0, n < 0 ? Infinity : n, xs);
    }));

    /**
     * Returns a new list containing the last `n` elements of a given list, passing
     * each value to the supplied predicate function, and terminating when the
     * predicate function returns `false`. Excludes the element that caused the
     * predicate function to fail. The predicate function is passed one argument:
     * *(value)*.
     *
     * @func
     * @memberOf R
     * @since v0.16.0
     * @category List
     * @sig (a -> Boolean) -> [a] -> [a]
     * @param {Function} fn The function called per iteration.
     * @param {Array} list The collection to iterate over.
     * @return {Array} A new array.
     * @see R.dropLastWhile, R.addIndex
     * @example
     *
     *      var isNotOne = x => x !== 1;
     *
     *      R.takeLastWhile(isNotOne, [1, 2, 3, 4]); //=> [2, 3, 4]
     */
    var takeLastWhile = _curry2(function takeLastWhile(fn, list) {
        var idx = list.length - 1;
        while (idx >= 0 && fn(list[idx])) {
            idx -= 1;
        }
        return _slice(list, idx + 1, Infinity);
    });

    /**
     * Returns a new list containing the first `n` elements of a given list,
     * passing each value to the supplied predicate function, and terminating when
     * the predicate function returns `false`. Excludes the element that caused the
     * predicate function to fail. The predicate function is passed one argument:
     * *(value)*.
     *
     * Dispatches to the `takeWhile` method of the second argument, if present.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig (a -> Boolean) -> [a] -> [a]
     * @param {Function} fn The function called per iteration.
     * @param {Array} list The collection to iterate over.
     * @return {Array} A new array.
     * @see R.dropWhile, R.transduce, R.addIndex
     * @example
     *
     *      var isNotFour = x => x !== 4;
     *
     *      R.takeWhile(isNotFour, [1, 2, 3, 4, 3, 2, 1]); //=> [1, 2, 3]
     */
    var takeWhile = _curry2(_dispatchable('takeWhile', _xtakeWhile, function takeWhile(fn, list) {
        var idx = 0;
        var len = list.length;
        while (idx < len && fn(list[idx])) {
            idx += 1;
        }
        return _slice(list, 0, idx);
    }));

    /**
     * Runs the given function with the supplied object, then returns the object.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Function
     * @sig (a -> *) -> a -> a
     * @param {Function} fn The function to call with `x`. The return value of `fn` will be thrown away.
     * @param {*} x
     * @return {*} `x`.
     * @example
     *
     *      var sayX = x => console.log('x is ' + x);
     *      R.tap(sayX, 100); //=> 100
     *      // logs 'x is 100'
     */
    var tap = _curry2(function tap(fn, x) {
        fn(x);
        return x;
    });

    /**
     * Calls an input function `n` times, returning an array containing the results
     * of those function calls.
     *
     * `fn` is passed one argument: The current value of `n`, which begins at `0`
     * and is gradually incremented to `n - 1`.
     *
     * @func
     * @memberOf R
     * @since v0.2.3
     * @category List
     * @sig (Number -> a) -> Number -> [a]
     * @param {Function} fn The function to invoke. Passed one argument, the current value of `n`.
     * @param {Number} n A value between `0` and `n - 1`. Increments after each function call.
     * @return {Array} An array containing the return values of all calls to `fn`.
     * @example
     *
     *      R.times(R.identity, 5); //=> [0, 1, 2, 3, 4]
     */
    var times = _curry2(function times(fn, n) {
        var len = Number(n);
        var idx = 0;
        var list;
        if (len < 0 || isNaN(len)) {
            throw new RangeError('n must be a non-negative number');
        }
        list = new Array(len);
        while (idx < len) {
            list[idx] = fn(idx);
            idx += 1;
        }
        return list;
    });

    /**
     * Converts an object into an array of key, value arrays. Only the object's
     * own properties are used.
     * Note that the order of the output array is not guaranteed to be consistent
     * across different JS platforms.
     *
     * @func
     * @memberOf R
     * @since v0.4.0
     * @category Object
     * @sig {String: *} -> [[String,*]]
     * @param {Object} obj The object to extract from
     * @return {Array} An array of key, value arrays from the object's own properties.
     * @see R.fromPairs
     * @example
     *
     *      R.toPairs({a: 1, b: 2, c: 3}); //=> [['a', 1], ['b', 2], ['c', 3]]
     */
    var toPairs = _curry1(function toPairs(obj) {
        var pairs = [];
        for (var prop in obj) {
            if (_has(prop, obj)) {
                pairs[pairs.length] = [
                    prop,
                    obj[prop]
                ];
            }
        }
        return pairs;
    });

    /**
     * Converts an object into an array of key, value arrays. The object's own
     * properties and prototype properties are used. Note that the order of the
     * output array is not guaranteed to be consistent across different JS
     * platforms.
     *
     * @func
     * @memberOf R
     * @since v0.4.0
     * @category Object
     * @sig {String: *} -> [[String,*]]
     * @param {Object} obj The object to extract from
     * @return {Array} An array of key, value arrays from the object's own
     *         and prototype properties.
     * @example
     *
     *      var F = function() { this.x = 'X'; };
     *      F.prototype.y = 'Y';
     *      var f = new F();
     *      R.toPairsIn(f); //=> [['x','X'], ['y','Y']]
     */
    var toPairsIn = _curry1(function toPairsIn(obj) {
        var pairs = [];
        for (var prop in obj) {
            pairs[pairs.length] = [
                prop,
                obj[prop]
            ];
        }
        return pairs;
    });

    /**
     * Transposes the rows and columns of a 2D list.
     * When passed a list of `n` lists of length `x`,
     * returns a list of `x` lists of length `n`.
     *
     *
     * @func
     * @memberOf R
     * @since v0.19.0
     * @category List
     * @sig [[a]] -> [[a]]
     * @param {Array} list A 2D list
     * @return {Array} A 2D list
     * @example
     *
     *      R.transpose([[1, 'a'], [2, 'b'], [3, 'c']]) //=> [[1, 2, 3], ['a', 'b', 'c']]
     *      R.transpose([[1, 2, 3], ['a', 'b', 'c']]) //=> [[1, 'a'], [2, 'b'], [3, 'c']]
     *
     * If some of the rows are shorter than the following rows, their elements are skipped:
     *
     *      R.transpose([[10, 11], [20], [], [30, 31, 32]]) //=> [[10, 20, 30], [11, 31], [32]]
     */
    var transpose = _curry1(function transpose(outerlist) {
        var i = 0;
        var result = [];
        while (i < outerlist.length) {
            var innerlist = outerlist[i];
            var j = 0;
            while (j < innerlist.length) {
                if (typeof result[j] === 'undefined') {
                    result[j] = [];
                }
                result[j].push(innerlist[j]);
                j += 1;
            }
            i += 1;
        }
        return result;
    });

    /**
     * Removes (strips) whitespace from both ends of the string.
     *
     * @func
     * @memberOf R
     * @since v0.6.0
     * @category String
     * @sig String -> String
     * @param {String} str The string to trim.
     * @return {String} Trimmed version of `str`.
     * @example
     *
     *      R.trim('   xyz  '); //=> 'xyz'
     *      R.map(R.trim, R.split(',', 'x, y, z')); //=> ['x', 'y', 'z']
     */
    var trim = function () {
        var ws = '\t\n\x0B\f\r \xA0\u1680\u180E\u2000\u2001\u2002\u2003' + '\u2004\u2005\u2006\u2007\u2008\u2009\u200A\u202F\u205F\u3000\u2028' + '\u2029\uFEFF';
        var zeroWidth = '\u200B';
        var hasProtoTrim = typeof String.prototype.trim === 'function';
        if (!hasProtoTrim || (ws.trim() || !zeroWidth.trim())) {
            return _curry1(function trim(str) {
                var beginRx = new RegExp('^[' + ws + '][' + ws + ']*');
                var endRx = new RegExp('[' + ws + '][' + ws + ']*$');
                return str.replace(beginRx, '').replace(endRx, '');
            });
        } else {
            return _curry1(function trim(str) {
                return str.trim();
            });
        }
    }();

    /**
     * `tryCatch` takes two functions, a `tryer` and a `catcher`. The returned
     * function evaluates the `tryer`; if it does not throw, it simply returns the
     * result. If the `tryer` *does* throw, the returned function evaluates the
     * `catcher` function and returns its result. Note that for effective
     * composition with this function, both the `tryer` and `catcher` functions
     * must return the same type of results.
     *
     * @func
     * @memberOf R
     * @since v0.20.0
     * @category Function
     * @sig (...x -> a) -> ((e, ...x) -> a) -> (...x -> a)
     * @param {Function} tryer The function that may throw.
     * @param {Function} catcher The function that will be evaluated if `tryer` throws.
     * @return {Function} A new function that will catch exceptions and send then to the catcher.
     * @example
     *
     *      R.tryCatch(R.prop('x'), R.F)({x: true}); //=> true
     *      R.tryCatch(R.prop('x'), R.F)(null);      //=> false
     */
    var tryCatch = _curry2(function _tryCatch(tryer, catcher) {
        return _arity(tryer.length, function () {
            try {
                return tryer.apply(this, arguments);
            } catch (e) {
                return catcher.apply(this, _concat([e], arguments));
            }
        });
    });

    /**
     * Gives a single-word string description of the (native) type of a value,
     * returning such answers as 'Object', 'Number', 'Array', or 'Null'. Does not
     * attempt to distinguish user Object types any further, reporting them all as
     * 'Object'.
     *
     * @func
     * @memberOf R
     * @since v0.8.0
     * @category Type
     * @sig (* -> {*}) -> String
     * @param {*} val The value to test
     * @return {String}
     * @example
     *
     *      R.type({}); //=> "Object"
     *      R.type(1); //=> "Number"
     *      R.type(false); //=> "Boolean"
     *      R.type('s'); //=> "String"
     *      R.type(null); //=> "Null"
     *      R.type([]); //=> "Array"
     *      R.type(/[A-z]/); //=> "RegExp"
     */
    var type = _curry1(function type(val) {
        return val === null ? 'Null' : val === undefined ? 'Undefined' : Object.prototype.toString.call(val).slice(8, -1);
    });

    /**
     * Takes a function `fn`, which takes a single array argument, and returns a
     * function which:
     *
     *   - takes any number of positional arguments;
     *   - passes these arguments to `fn` as an array; and
     *   - returns the result.
     *
     * In other words, R.unapply derives a variadic function from a function which
     * takes an array. R.unapply is the inverse of R.apply.
     *
     * @func
     * @memberOf R
     * @since v0.8.0
     * @category Function
     * @sig ([*...] -> a) -> (*... -> a)
     * @param {Function} fn
     * @return {Function}
     * @see R.apply
     * @example
     *
     *      R.unapply(JSON.stringify)(1, 2, 3); //=> '[1,2,3]'
     */
    var unapply = _curry1(function unapply(fn) {
        return function () {
            return fn(_slice(arguments));
        };
    });

    /**
     * Wraps a function of any arity (including nullary) in a function that accepts
     * exactly 1 parameter. Any extraneous parameters will not be passed to the
     * supplied function.
     *
     * @func
     * @memberOf R
     * @since v0.2.0
     * @category Function
     * @sig (* -> b) -> (a -> b)
     * @param {Function} fn The function to wrap.
     * @return {Function} A new function wrapping `fn`. The new function is guaranteed to be of
     *         arity 1.
     * @example
     *
     *      var takesTwoArgs = function(a, b) {
     *        return [a, b];
     *      };
     *      takesTwoArgs.length; //=> 2
     *      takesTwoArgs(1, 2); //=> [1, 2]
     *
     *      var takesOneArg = R.unary(takesTwoArgs);
     *      takesOneArg.length; //=> 1
     *      // Only 1 argument is passed to the wrapped function
     *      takesOneArg(1, 2); //=> [1, undefined]
     */
    var unary = _curry1(function unary(fn) {
        return nAry(1, fn);
    });

    /**
     * Returns a function of arity `n` from a (manually) curried function.
     *
     * @func
     * @memberOf R
     * @since v0.14.0
     * @category Function
     * @sig Number -> (a -> b) -> (a -> c)
     * @param {Number} length The arity for the returned function.
     * @param {Function} fn The function to uncurry.
     * @return {Function} A new function.
     * @see R.curry
     * @example
     *
     *      var addFour = a => b => c => d => a + b + c + d;
     *
     *      var uncurriedAddFour = R.uncurryN(4, addFour);
     *      uncurriedAddFour(1, 2, 3, 4); //=> 10
     */
    var uncurryN = _curry2(function uncurryN(depth, fn) {
        return curryN(depth, function () {
            var currentDepth = 1;
            var value = fn;
            var idx = 0;
            var endIdx;
            while (currentDepth <= depth && typeof value === 'function') {
                endIdx = currentDepth === depth ? arguments.length : idx + value.length;
                value = value.apply(this, _slice(arguments, idx, endIdx));
                currentDepth += 1;
                idx = endIdx;
            }
            return value;
        });
    });

    /**
     * Builds a list from a seed value. Accepts an iterator function, which returns
     * either false to stop iteration or an array of length 2 containing the value
     * to add to the resulting list and the seed to be used in the next call to the
     * iterator function.
     *
     * The iterator function receives one argument: *(seed)*.
     *
     * @func
     * @memberOf R
     * @since v0.10.0
     * @category List
     * @sig (a -> [b]) -> * -> [b]
     * @param {Function} fn The iterator function. receives one argument, `seed`, and returns
     *        either false to quit iteration or an array of length two to proceed. The element
     *        at index 0 of this array will be added to the resulting array, and the element
     *        at index 1 will be passed to the next call to `fn`.
     * @param {*} seed The seed value.
     * @return {Array} The final list.
     * @example
     *
     *      var f = n => n > 50 ? false : [-n, n + 10];
     *      R.unfold(f, 10); //=> [-10, -20, -30, -40, -50]
     */
    var unfold = _curry2(function unfold(fn, seed) {
        var pair = fn(seed);
        var result = [];
        while (pair && pair.length) {
            result[result.length] = pair[0];
            pair = fn(pair[1]);
        }
        return result;
    });

    /**
     * Returns a new list containing only one copy of each element in the original
     * list, based upon the value returned by applying the supplied predicate to
     * two list elements. Prefers the first item if two items compare equal based
     * on the predicate.
     *
     * @func
     * @memberOf R
     * @since v0.2.0
     * @category List
     * @sig (a, a -> Boolean) -> [a] -> [a]
     * @param {Function} pred A predicate used to test whether two items are equal.
     * @param {Array} list The array to consider.
     * @return {Array} The list of unique items.
     * @example
     *
     *      var strEq = R.eqBy(String);
     *      R.uniqWith(strEq)([1, '1', 2, 1]); //=> [1, 2]
     *      R.uniqWith(strEq)([{}, {}]);       //=> [{}]
     *      R.uniqWith(strEq)([1, '1', 1]);    //=> [1]
     *      R.uniqWith(strEq)(['1', 1, 1]);    //=> ['1']
     */
    var uniqWith = _curry2(function uniqWith(pred, list) {
        var idx = 0;
        var len = list.length;
        var result = [];
        var item;
        while (idx < len) {
            item = list[idx];
            if (!_containsWith(pred, item, result)) {
                result[result.length] = item;
            }
            idx += 1;
        }
        return result;
    });

    /**
     * Tests the final argument by passing it to the given predicate function. If
     * the predicate is not satisfied, the function will return the result of
     * calling the `whenFalseFn` function with the same argument. If the predicate
     * is satisfied, the argument is returned as is.
     *
     * @func
     * @memberOf R
     * @since v0.18.0
     * @category Logic
     * @sig (a -> Boolean) -> (a -> a) -> a -> a
     * @param {Function} pred        A predicate function
     * @param {Function} whenFalseFn A function to invoke when the `pred` evaluates
     *                               to a falsy value.
     * @param {*}        x           An object to test with the `pred` function and
     *                               pass to `whenFalseFn` if necessary.
     * @return {*} Either `x` or the result of applying `x` to `whenFalseFn`.
     * @see R.ifElse, R.when
     * @example
     *
     *      // coerceArray :: (a|[a]) -> [a]
     *      var coerceArray = R.unless(R.isArrayLike, R.of);
     *      coerceArray([1, 2, 3]); //=> [1, 2, 3]
     *      coerceArray(1);         //=> [1]
     */
    var unless = _curry3(function unless(pred, whenFalseFn, x) {
        return pred(x) ? x : whenFalseFn(x);
    });

    /**
     * Takes a predicate, a transformation function, and an initial value,
     * and returns a value of the same type as the initial value.
     * It does so by applying the transformation until the predicate is satisfied,
     * at which point it returns the satisfactory value.
     *
     * @func
     * @memberOf R
     * @since v0.20.0
     * @category Logic
     * @sig (a -> Boolean) -> (a -> a) -> a -> a
     * @param {Function} pred A predicate function
     * @param {Function} fn The iterator function
     * @param {*} init Initial value
     * @return {*} Final value that satisfies predicate
     * @example
     *
     *      R.until(R.gt(R.__, 100), R.multiply(2))(1) // => 128
     */
    var until = _curry3(function until(pred, fn, init) {
        var val = init;
        while (!pred(val)) {
            val = fn(val);
        }
        return val;
    });

    /**
     * Returns a new copy of the array with the element at the provided index
     * replaced with the given value.
     *
     * @func
     * @memberOf R
     * @since v0.14.0
     * @category List
     * @sig Number -> a -> [a] -> [a]
     * @param {Number} idx The index to update.
     * @param {*} x The value to exist at the given index of the returned array.
     * @param {Array|Arguments} list The source array-like object to be updated.
     * @return {Array} A copy of `list` with the value at index `idx` replaced with `x`.
     * @see R.adjust
     * @example
     *
     *      R.update(1, 11, [0, 1, 2]);     //=> [0, 11, 2]
     *      R.update(1)(11)([0, 1, 2]);     //=> [0, 11, 2]
     */
    var update = _curry3(function update(idx, x, list) {
        return adjust(always(x), idx, list);
    });

    /**
     * Accepts a function `fn` and a list of transformer functions and returns a
     * new curried function. When the new function is invoked, it calls the
     * function `fn` with parameters consisting of the result of calling each
     * supplied handler on successive arguments to the new function.
     *
     * If more arguments are passed to the returned function than transformer
     * functions, those arguments are passed directly to `fn` as additional
     * parameters. If you expect additional arguments that don't need to be
     * transformed, although you can ignore them, it's best to pass an identity
     * function so that the new function reports the correct arity.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Function
     * @sig (x1 -> x2 -> ... -> z) -> [(a -> x1), (b -> x2), ...] -> (a -> b -> ... -> z)
     * @param {Function} fn The function to wrap.
     * @param {Array} transformers A list of transformer functions
     * @return {Function} The wrapped function.
     * @example
     *
     *      R.useWith(Math.pow, [R.identity, R.identity])(3, 4); //=> 81
     *      R.useWith(Math.pow, [R.identity, R.identity])(3)(4); //=> 81
     *      R.useWith(Math.pow, [R.dec, R.inc])(3, 4); //=> 32
     *      R.useWith(Math.pow, [R.dec, R.inc])(3)(4); //=> 32
     */
    var useWith = _curry2(function useWith(fn, transformers) {
        return curryN(transformers.length, function () {
            var args = [];
            var idx = 0;
            while (idx < transformers.length) {
                args.push(transformers[idx].call(this, arguments[idx]));
                idx += 1;
            }
            return fn.apply(this, args.concat(_slice(arguments, transformers.length)));
        });
    });

    /**
     * Returns a list of all the enumerable own properties of the supplied object.
     * Note that the order of the output array is not guaranteed across different
     * JS platforms.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Object
     * @sig {k: v} -> [v]
     * @param {Object} obj The object to extract values from
     * @return {Array} An array of the values of the object's own properties.
     * @example
     *
     *      R.values({a: 1, b: 2, c: 3}); //=> [1, 2, 3]
     */
    var values = _curry1(function values(obj) {
        var props = keys(obj);
        var len = props.length;
        var vals = [];
        var idx = 0;
        while (idx < len) {
            vals[idx] = obj[props[idx]];
            idx += 1;
        }
        return vals;
    });

    /**
     * Returns a list of all the properties, including prototype properties, of the
     * supplied object.
     * Note that the order of the output array is not guaranteed to be consistent
     * across different JS platforms.
     *
     * @func
     * @memberOf R
     * @since v0.2.0
     * @category Object
     * @sig {k: v} -> [v]
     * @param {Object} obj The object to extract values from
     * @return {Array} An array of the values of the object's own and prototype properties.
     * @example
     *
     *      var F = function() { this.x = 'X'; };
     *      F.prototype.y = 'Y';
     *      var f = new F();
     *      R.valuesIn(f); //=> ['X', 'Y']
     */
    var valuesIn = _curry1(function valuesIn(obj) {
        var prop;
        var vs = [];
        for (prop in obj) {
            vs[vs.length] = obj[prop];
        }
        return vs;
    });

    /**
     * Returns a "view" of the given data structure, determined by the given lens.
     * The lens's focus determines which portion of the data structure is visible.
     *
     * @func
     * @memberOf R
     * @since v0.16.0
     * @category Object
     * @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
     * @sig Lens s a -> s -> a
     * @param {Lens} lens
     * @param {*} x
     * @return {*}
     * @see R.prop, R.lensIndex, R.lensProp
     * @example
     *
     *      var xLens = R.lensProp('x');
     *
     *      R.view(xLens, {x: 1, y: 2});  //=> 1
     *      R.view(xLens, {x: 4, y: 2});  //=> 4
     */
    // `Const` is a functor that effectively ignores the function given to `map`.
    // Using `Const` effectively ignores the setter function of the `lens`,
    // leaving the value returned by the getter function unmodified.
    var view = function () {
        // `Const` is a functor that effectively ignores the function given to `map`.
        var Const = function (x) {
            return {
                value: x,
                map: function () {
                    return this;
                }
            };
        };
        return _curry2(function view(lens, x) {
            // Using `Const` effectively ignores the setter function of the `lens`,
            // leaving the value returned by the getter function unmodified.
            return lens(Const)(x).value;
        });
    }();

    /**
     * Tests the final argument by passing it to the given predicate function. If
     * the predicate is satisfied, the function will return the result of calling
     * the `whenTrueFn` function with the same argument. If the predicate is not
     * satisfied, the argument is returned as is.
     *
     * @func
     * @memberOf R
     * @since v0.18.0
     * @category Logic
     * @sig (a -> Boolean) -> (a -> a) -> a -> a
     * @param {Function} pred       A predicate function
     * @param {Function} whenTrueFn A function to invoke when the `condition`
     *                              evaluates to a truthy value.
     * @param {*}        x          An object to test with the `pred` function and
     *                              pass to `whenTrueFn` if necessary.
     * @return {*} Either `x` or the result of applying `x` to `whenTrueFn`.
     * @see R.ifElse, R.unless
     * @example
     *
     *      // truncate :: String -> String
     *      var truncate = R.when(
     *        R.propSatisfies(R.gt(R.__, 10), 'length'),
     *        R.pipe(R.take(10), R.append('…'), R.join(''))
     *      );
     *      truncate('12345');         //=> '12345'
     *      truncate('0123456789ABC'); //=> '0123456789…'
     */
    var when = _curry3(function when(pred, whenTrueFn, x) {
        return pred(x) ? whenTrueFn(x) : x;
    });

    /**
     * Takes a spec object and a test object; returns true if the test satisfies
     * the spec. Each of the spec's own properties must be a predicate function.
     * Each predicate is applied to the value of the corresponding property of the
     * test object. `where` returns true if all the predicates return true, false
     * otherwise.
     *
     * `where` is well suited to declaratively expressing constraints for other
     * functions such as `filter` and `find`.
     *
     * @func
     * @memberOf R
     * @since v0.1.1
     * @category Object
     * @sig {String: (* -> Boolean)} -> {String: *} -> Boolean
     * @param {Object} spec
     * @param {Object} testObj
     * @return {Boolean}
     * @example
     *
     *      // pred :: Object -> Boolean
     *      var pred = where({
     *        a: equals('foo'),
     *        b: complement(equals('bar')),
     *        x: gt(__, 10),
     *        y: lt(__, 20)
     *      });
     *
     *      pred({a: 'foo', b: 'xxx', x: 11, y: 19}); //=> true
     *      pred({a: 'xxx', b: 'xxx', x: 11, y: 19}); //=> false
     *      pred({a: 'foo', b: 'bar', x: 11, y: 19}); //=> false
     *      pred({a: 'foo', b: 'xxx', x: 10, y: 19}); //=> false
     *      pred({a: 'foo', b: 'xxx', x: 11, y: 20}); //=> false
     */
    var where = _curry2(function where(spec, testObj) {
        for (var prop in spec) {
            if (_has(prop, spec) && !spec[prop](testObj[prop])) {
                return false;
            }
        }
        return true;
    });

    /**
     * Wrap a function inside another to allow you to make adjustments to the
     * parameters, or do other processing either before the internal function is
     * called or with its results.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Function
     * @sig (a... -> b) -> ((a... -> b) -> a... -> c) -> (a... -> c)
     * @param {Function} fn The function to wrap.
     * @param {Function} wrapper The wrapper function.
     * @return {Function} The wrapped function.
     * @deprecated since v0.22.0
     * @example
     *
     *      var greet = name => 'Hello ' + name;
     *
     *      var shoutedGreet = R.wrap(greet, (gr, name) => gr(name).toUpperCase());
     *
     *      shoutedGreet("Kathy"); //=> "HELLO KATHY"
     *
     *      var shortenedGreet = R.wrap(greet, function(gr, name) {
     *        return gr(name.substring(0, 3));
     *      });
     *      shortenedGreet("Robert"); //=> "Hello Rob"
     */
    var wrap = _curry2(function wrap(fn, wrapper) {
        return curryN(fn.length, function () {
            return wrapper.apply(this, _concat([fn], arguments));
        });
    });

    /**
     * Creates a new list out of the two supplied by creating each possible pair
     * from the lists.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig [a] -> [b] -> [[a,b]]
     * @param {Array} as The first list.
     * @param {Array} bs The second list.
     * @return {Array} The list made by combining each possible pair from
     *         `as` and `bs` into pairs (`[a, b]`).
     * @example
     *
     *      R.xprod([1, 2], ['a', 'b']); //=> [[1, 'a'], [1, 'b'], [2, 'a'], [2, 'b']]
     */
    // = xprodWith(prepend); (takes about 3 times as long...)
    var xprod = _curry2(function xprod(a, b) {
        // = xprodWith(prepend); (takes about 3 times as long...)
        var idx = 0;
        var ilen = a.length;
        var j;
        var jlen = b.length;
        var result = [];
        while (idx < ilen) {
            j = 0;
            while (j < jlen) {
                result[result.length] = [
                    a[idx],
                    b[j]
                ];
                j += 1;
            }
            idx += 1;
        }
        return result;
    });

    /**
     * Creates a new list out of the two supplied by pairing up equally-positioned
     * items from both lists. The returned list is truncated to the length of the
     * shorter of the two input lists.
     * Note: `zip` is equivalent to `zipWith(function(a, b) { return [a, b] })`.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig [a] -> [b] -> [[a,b]]
     * @param {Array} list1 The first array to consider.
     * @param {Array} list2 The second array to consider.
     * @return {Array} The list made by pairing up same-indexed elements of `list1` and `list2`.
     * @example
     *
     *      R.zip([1, 2, 3], ['a', 'b', 'c']); //=> [[1, 'a'], [2, 'b'], [3, 'c']]
     */
    var zip = _curry2(function zip(a, b) {
        var rv = [];
        var idx = 0;
        var len = Math.min(a.length, b.length);
        while (idx < len) {
            rv[idx] = [
                a[idx],
                b[idx]
            ];
            idx += 1;
        }
        return rv;
    });

    /**
     * Creates a new object out of a list of keys and a list of values.
     * Key/value pairing is truncated to the length of the shorter of the two lists.
     * Note: `zipObj` is equivalent to `pipe(zipWith(pair), fromPairs)`.
     *
     * @func
     * @memberOf R
     * @since v0.3.0
     * @category List
     * @sig [String] -> [*] -> {String: *}
     * @param {Array} keys The array that will be properties on the output object.
     * @param {Array} values The list of values on the output object.
     * @return {Object} The object made by pairing up same-indexed elements of `keys` and `values`.
     * @example
     *
     *      R.zipObj(['a', 'b', 'c'], [1, 2, 3]); //=> {a: 1, b: 2, c: 3}
     */
    var zipObj = _curry2(function zipObj(keys, values) {
        var idx = 0;
        var len = Math.min(keys.length, values.length);
        var out = {};
        while (idx < len) {
            out[keys[idx]] = values[idx];
            idx += 1;
        }
        return out;
    });

    /**
     * Creates a new list out of the two supplied by applying the function to each
     * equally-positioned pair in the lists. The returned list is truncated to the
     * length of the shorter of the two input lists.
     *
     * @function
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig (a,b -> c) -> [a] -> [b] -> [c]
     * @param {Function} fn The function used to combine the two elements into one value.
     * @param {Array} list1 The first array to consider.
     * @param {Array} list2 The second array to consider.
     * @return {Array} The list made by combining same-indexed elements of `list1` and `list2`
     *         using `fn`.
     * @example
     *
     *      var f = (x, y) => {
     *        // ...
     *      };
     *      R.zipWith(f, [1, 2, 3], ['a', 'b', 'c']);
     *      //=> [f(1, 'a'), f(2, 'b'), f(3, 'c')]
     */
    var zipWith = _curry3(function zipWith(fn, a, b) {
        var rv = [];
        var idx = 0;
        var len = Math.min(a.length, b.length);
        while (idx < len) {
            rv[idx] = fn(a[idx], b[idx]);
            idx += 1;
        }
        return rv;
    });

    /**
     * A function that always returns `false`. Any passed in parameters are ignored.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category Function
     * @sig * -> Boolean
     * @param {*}
     * @return {Boolean}
     * @see R.always, R.T
     * @example
     *
     *      R.F(); //=> false
     */
    var F = always(false);

    /**
     * A function that always returns `true`. Any passed in parameters are ignored.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category Function
     * @sig * -> Boolean
     * @param {*}
     * @return {Boolean}
     * @see R.always, R.F
     * @example
     *
     *      R.T(); //=> true
     */
    var T = always(true);

    /**
     * Copies an object.
     *
     * @private
     * @param {*} value The value to be copied
     * @param {Array} refFrom Array containing the source references
     * @param {Array} refTo Array containing the copied source references
     * @param {Boolean} deep Whether or not to perform deep cloning.
     * @return {*} The copied value.
     */
    var _clone = function _clone(value, refFrom, refTo, deep) {
        var copy = function copy(copiedValue) {
            var len = refFrom.length;
            var idx = 0;
            while (idx < len) {
                if (value === refFrom[idx]) {
                    return refTo[idx];
                }
                idx += 1;
            }
            refFrom[idx + 1] = value;
            refTo[idx + 1] = copiedValue;
            for (var key in value) {
                copiedValue[key] = deep ? _clone(value[key], refFrom, refTo, true) : value[key];
            }
            return copiedValue;
        };
        switch (type(value)) {
        case 'Object':
            return copy({});
        case 'Array':
            return copy([]);
        case 'Date':
            return new Date(value.valueOf());
        case 'RegExp':
            return _cloneRegExp(value);
        default:
            return value;
        }
    };

    var _createPartialApplicator = function _createPartialApplicator(concat) {
        return _curry2(function (fn, args) {
            return _arity(Math.max(0, fn.length - args.length), function () {
                return fn.apply(this, concat(args, arguments));
            });
        });
    };

    var _dropLast = function dropLast(n, xs) {
        return take(n < xs.length ? xs.length - n : 0, xs);
    };

    // Values of other types are only equal if identical.
    var _equals = function _equals(a, b, stackA, stackB) {
        if (identical(a, b)) {
            return true;
        }
        if (type(a) !== type(b)) {
            return false;
        }
        if (a == null || b == null) {
            return false;
        }
        if (typeof a.equals === 'function' || typeof b.equals === 'function') {
            return typeof a.equals === 'function' && a.equals(b) && typeof b.equals === 'function' && b.equals(a);
        }
        switch (type(a)) {
        case 'Arguments':
        case 'Array':
        case 'Object':
            if (typeof a.constructor === 'function' && _functionName(a.constructor) === 'Promise') {
                return a === b;
            }
            break;
        case 'Boolean':
        case 'Number':
        case 'String':
            if (!(typeof a === typeof b && identical(a.valueOf(), b.valueOf()))) {
                return false;
            }
            break;
        case 'Date':
            if (!identical(a.valueOf(), b.valueOf())) {
                return false;
            }
            break;
        case 'Error':
            return a.name === b.name && a.message === b.message;
        case 'RegExp':
            if (!(a.source === b.source && a.global === b.global && a.ignoreCase === b.ignoreCase && a.multiline === b.multiline && a.sticky === b.sticky && a.unicode === b.unicode)) {
                return false;
            }
            break;
        case 'Map':
        case 'Set':
            if (!_equals(_arrayFromIterator(a.entries()), _arrayFromIterator(b.entries()), stackA, stackB)) {
                return false;
            }
            break;
        case 'Int8Array':
        case 'Uint8Array':
        case 'Uint8ClampedArray':
        case 'Int16Array':
        case 'Uint16Array':
        case 'Int32Array':
        case 'Uint32Array':
        case 'Float32Array':
        case 'Float64Array':
            break;
        case 'ArrayBuffer':
            break;
        default:
            // Values of other types are only equal if identical.
            return false;
        }
        var keysA = keys(a);
        if (keysA.length !== keys(b).length) {
            return false;
        }
        var idx = stackA.length - 1;
        while (idx >= 0) {
            if (stackA[idx] === a) {
                return stackB[idx] === b;
            }
            idx -= 1;
        }
        stackA.push(a);
        stackB.push(b);
        idx = keysA.length - 1;
        while (idx >= 0) {
            var key = keysA[idx];
            if (!(_has(key, b) && _equals(b[key], a[key], stackA, stackB))) {
                return false;
            }
            idx -= 1;
        }
        stackA.pop();
        stackB.pop();
        return true;
    };

    /**
     * `_makeFlat` is a helper function that returns a one-level or fully recursive
     * function based on the flag passed in.
     *
     * @private
     */
    var _makeFlat = function _makeFlat(recursive) {
        return function flatt(list) {
            var value, jlen, j;
            var result = [];
            var idx = 0;
            var ilen = list.length;
            while (idx < ilen) {
                if (isArrayLike(list[idx])) {
                    value = recursive ? flatt(list[idx]) : list[idx];
                    j = 0;
                    jlen = value.length;
                    while (j < jlen) {
                        result[result.length] = value[j];
                        j += 1;
                    }
                } else {
                    result[result.length] = list[idx];
                }
                idx += 1;
            }
            return result;
        };
    };

    var _reduce = function () {
        function _arrayReduce(xf, acc, list) {
            var idx = 0;
            var len = list.length;
            while (idx < len) {
                acc = xf['@@transducer/step'](acc, list[idx]);
                if (acc && acc['@@transducer/reduced']) {
                    acc = acc['@@transducer/value'];
                    break;
                }
                idx += 1;
            }
            return xf['@@transducer/result'](acc);
        }
        function _iterableReduce(xf, acc, iter) {
            var step = iter.next();
            while (!step.done) {
                acc = xf['@@transducer/step'](acc, step.value);
                if (acc && acc['@@transducer/reduced']) {
                    acc = acc['@@transducer/value'];
                    break;
                }
                step = iter.next();
            }
            return xf['@@transducer/result'](acc);
        }
        function _methodReduce(xf, acc, obj) {
            return xf['@@transducer/result'](obj.reduce(bind(xf['@@transducer/step'], xf), acc));
        }
        var symIterator = typeof Symbol !== 'undefined' ? Symbol.iterator : '@@iterator';
        return function _reduce(fn, acc, list) {
            if (typeof fn === 'function') {
                fn = _xwrap(fn);
            }
            if (isArrayLike(list)) {
                return _arrayReduce(fn, acc, list);
            }
            if (typeof list.reduce === 'function') {
                return _methodReduce(fn, acc, list);
            }
            if (list[symIterator] != null) {
                return _iterableReduce(fn, acc, list[symIterator]());
            }
            if (typeof list.next === 'function') {
                return _iterableReduce(fn, acc, list);
            }
            throw new TypeError('reduce: list must be array or iterable');
        };
    }();

    var _stepCat = function () {
        var _stepCatArray = {
            '@@transducer/init': Array,
            '@@transducer/step': function (xs, x) {
                xs.push(x);
                return xs;
            },
            '@@transducer/result': _identity
        };
        var _stepCatString = {
            '@@transducer/init': String,
            '@@transducer/step': function (a, b) {
                return a + b;
            },
            '@@transducer/result': _identity
        };
        var _stepCatObject = {
            '@@transducer/init': Object,
            '@@transducer/step': function (result, input) {
                return _assign(result, isArrayLike(input) ? objOf(input[0], input[1]) : input);
            },
            '@@transducer/result': _identity
        };
        return function _stepCat(obj) {
            if (_isTransformer(obj)) {
                return obj;
            }
            if (isArrayLike(obj)) {
                return _stepCatArray;
            }
            if (typeof obj === 'string') {
                return _stepCatString;
            }
            if (typeof obj === 'object') {
                return _stepCatObject;
            }
            throw new Error('Cannot create transformer for ' + obj);
        };
    }();

    var _xdropLastWhile = function () {
        function XDropLastWhile(fn, xf) {
            this.f = fn;
            this.retained = [];
            this.xf = xf;
        }
        XDropLastWhile.prototype['@@transducer/init'] = _xfBase.init;
        XDropLastWhile.prototype['@@transducer/result'] = function (result) {
            this.retained = null;
            return this.xf['@@transducer/result'](result);
        };
        XDropLastWhile.prototype['@@transducer/step'] = function (result, input) {
            return this.f(input) ? this.retain(result, input) : this.flush(result, input);
        };
        XDropLastWhile.prototype.flush = function (result, input) {
            result = _reduce(this.xf['@@transducer/step'], result, this.retained);
            this.retained = [];
            return this.xf['@@transducer/step'](result, input);
        };
        XDropLastWhile.prototype.retain = function (result, input) {
            this.retained.push(input);
            return result;
        };
        return _curry2(function _xdropLastWhile(fn, xf) {
            return new XDropLastWhile(fn, xf);
        });
    }();

    /**
     * Creates a new list iteration function from an existing one by adding two new
     * parameters to its callback function: the current index, and the entire list.
     *
     * This would turn, for instance, Ramda's simple `map` function into one that
     * more closely resembles `Array.prototype.map`. Note that this will only work
     * for functions in which the iteration callback function is the first
     * parameter, and where the list is the last parameter. (This latter might be
     * unimportant if the list parameter is not used.)
     *
     * @func
     * @memberOf R
     * @since v0.15.0
     * @category Function
     * @category List
     * @sig ((a ... -> b) ... -> [a] -> *) -> (a ..., Int, [a] -> b) ... -> [a] -> *)
     * @param {Function} fn A list iteration function that does not pass index or list to its callback
     * @return {Function} An altered list iteration function that passes (item, index, list) to its callback
     * @example
     *
     *      var mapIndexed = R.addIndex(R.map);
     *      mapIndexed((val, idx) => idx + '-' + val, ['f', 'o', 'o', 'b', 'a', 'r']);
     *      //=> ['0-f', '1-o', '2-o', '3-b', '4-a', '5-r']
     */
    var addIndex = _curry1(function addIndex(fn) {
        return curryN(fn.length, function () {
            var idx = 0;
            var origFn = arguments[0];
            var list = arguments[arguments.length - 1];
            var args = _slice(arguments);
            args[0] = function () {
                var result = origFn.apply(this, _concat(arguments, [
                    idx,
                    list
                ]));
                idx += 1;
                return result;
            };
            return fn.apply(this, args);
        });
    });

    /**
     * Wraps a function of any arity (including nullary) in a function that accepts
     * exactly 2 parameters. Any extraneous parameters will not be passed to the
     * supplied function.
     *
     * @func
     * @memberOf R
     * @since v0.2.0
     * @category Function
     * @sig (* -> c) -> (a, b -> c)
     * @param {Function} fn The function to wrap.
     * @return {Function} A new function wrapping `fn`. The new function is guaranteed to be of
     *         arity 2.
     * @example
     *
     *      var takesThreeArgs = function(a, b, c) {
     *        return [a, b, c];
     *      };
     *      takesThreeArgs.length; //=> 3
     *      takesThreeArgs(1, 2, 3); //=> [1, 2, 3]
     *
     *      var takesTwoArgs = R.binary(takesThreeArgs);
     *      takesTwoArgs.length; //=> 2
     *      // Only 2 arguments are passed to the wrapped function
     *      takesTwoArgs(1, 2, 3); //=> [1, 2, undefined]
     */
    var binary = _curry1(function binary(fn) {
        return nAry(2, fn);
    });

    /**
     * Creates a deep copy of the value which may contain (nested) `Array`s and
     * `Object`s, `Number`s, `String`s, `Boolean`s and `Date`s. `Function`s are not
     * copied, but assigned by their reference.
     *
     * Dispatches to a `clone` method if present.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Object
     * @sig {*} -> {*}
     * @param {*} value The object or array to clone
     * @return {*} A new object or array.
     * @example
     *
     *      var objects = [{}, {}, {}];
     *      var objectsClone = R.clone(objects);
     *      objects[0] === objectsClone[0]; //=> false
     */
    var clone = _curry1(function clone(value) {
        return value != null && typeof value.clone === 'function' ? value.clone() : _clone(value, [], [], true);
    });

    /**
     * Returns a curried equivalent of the provided function. The curried function
     * has two unusual capabilities. First, its arguments needn't be provided one
     * at a time. If `f` is a ternary function and `g` is `R.curry(f)`, the
     * following are equivalent:
     *
     *   - `g(1)(2)(3)`
     *   - `g(1)(2, 3)`
     *   - `g(1, 2)(3)`
     *   - `g(1, 2, 3)`
     *
     * Secondly, the special placeholder value `R.__` may be used to specify
     * "gaps", allowing partial application of any combination of arguments,
     * regardless of their positions. If `g` is as above and `_` is `R.__`, the
     * following are equivalent:
     *
     *   - `g(1, 2, 3)`
     *   - `g(_, 2, 3)(1)`
     *   - `g(_, _, 3)(1)(2)`
     *   - `g(_, _, 3)(1, 2)`
     *   - `g(_, 2)(1)(3)`
     *   - `g(_, 2)(1, 3)`
     *   - `g(_, 2)(_, 3)(1)`
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Function
     * @sig (* -> a) -> (* -> a)
     * @param {Function} fn The function to curry.
     * @return {Function} A new, curried function.
     * @see R.curryN
     * @example
     *
     *      var addFourNumbers = (a, b, c, d) => a + b + c + d;
     *
     *      var curriedAddFourNumbers = R.curry(addFourNumbers);
     *      var f = curriedAddFourNumbers(1, 2);
     *      var g = f(3);
     *      g(4); //=> 10
     */
    var curry = _curry1(function curry(fn) {
        return curryN(fn.length, fn);
    });

    /**
     * Returns all but the first `n` elements of the given list, string, or
     * transducer/transformer (or object with a `drop` method).
     *
     * Dispatches to the `drop` method of the second argument, if present.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig Number -> [a] -> [a]
     * @sig Number -> String -> String
     * @param {Number} n
     * @param {*} list
     * @return {*}
     * @see R.take, R.transduce
     * @example
     *
     *      R.drop(1, ['foo', 'bar', 'baz']); //=> ['bar', 'baz']
     *      R.drop(2, ['foo', 'bar', 'baz']); //=> ['baz']
     *      R.drop(3, ['foo', 'bar', 'baz']); //=> []
     *      R.drop(4, ['foo', 'bar', 'baz']); //=> []
     *      R.drop(3, 'ramda');               //=> 'da'
     */
    var drop = _curry2(_dispatchable('drop', _xdrop, function drop(n, xs) {
        return slice(Math.max(0, n), Infinity, xs);
    }));

    /**
     * Returns a list containing all but the last `n` elements of the given `list`.
     *
     * @func
     * @memberOf R
     * @since v0.16.0
     * @category List
     * @sig Number -> [a] -> [a]
     * @sig Number -> String -> String
     * @param {Number} n The number of elements of `xs` to skip.
     * @param {Array} xs The collection to consider.
     * @return {Array}
     * @see R.takeLast
     * @example
     *
     *      R.dropLast(1, ['foo', 'bar', 'baz']); //=> ['foo', 'bar']
     *      R.dropLast(2, ['foo', 'bar', 'baz']); //=> ['foo']
     *      R.dropLast(3, ['foo', 'bar', 'baz']); //=> []
     *      R.dropLast(4, ['foo', 'bar', 'baz']); //=> []
     *      R.dropLast(3, 'ramda');               //=> 'ra'
     */
    var dropLast = _curry2(_dispatchable('dropLast', _xdropLast, _dropLast));

    /**
     * Returns a new list excluding all the tailing elements of a given list which
     * satisfy the supplied predicate function. It passes each value from the right
     * to the supplied predicate function, skipping elements while the predicate
     * function returns `true`. The predicate function is applied to one argument:
     * *(value)*.
     *
     * @func
     * @memberOf R
     * @since v0.16.0
     * @category List
     * @sig (a -> Boolean) -> [a] -> [a]
     * @param {Function} fn The function called per iteration.
     * @param {Array} list The collection to iterate over.
     * @return {Array} A new array.
     * @see R.takeLastWhile, R.addIndex
     * @example
     *
     *      var lteThree = x => x <= 3;
     *
     *      R.dropLastWhile(lteThree, [1, 2, 3, 4, 3, 2, 1]); //=> [1, 2, 3, 4]
     */
    var dropLastWhile = _curry2(_dispatchable('dropLastWhile', _xdropLastWhile, _dropLastWhile));

    /**
     * Returns `true` if its arguments are equivalent, `false` otherwise. Handles
     * cyclical data structures.
     *
     * Dispatches symmetrically to the `equals` methods of both arguments, if
     * present.
     *
     * @func
     * @memberOf R
     * @since v0.15.0
     * @category Relation
     * @sig a -> b -> Boolean
     * @param {*} a
     * @param {*} b
     * @return {Boolean}
     * @example
     *
     *      R.equals(1, 1); //=> true
     *      R.equals(1, '1'); //=> false
     *      R.equals([1, 2, 3], [1, 2, 3]); //=> true
     *
     *      var a = {}; a.v = a;
     *      var b = {}; b.v = b;
     *      R.equals(a, b); //=> true
     */
    var equals = _curry2(function equals(a, b) {
        return _equals(a, b, [], []);
    });

    /**
     * Takes a predicate and a "filterable", and returns a new filterable of the
     * same type containing the members of the given filterable which satisfy the
     * given predicate.
     *
     * Dispatches to the `filter` method of the second argument, if present.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig Filterable f => (a -> Boolean) -> f a -> f a
     * @param {Function} pred
     * @param {Array} filterable
     * @return {Array}
     * @see R.reject, R.transduce, R.addIndex
     * @example
     *
     *      var isEven = n => n % 2 === 0;
     *
     *      R.filter(isEven, [1, 2, 3, 4]); //=> [2, 4]
     *
     *      R.filter(isEven, {a: 1, b: 2, c: 3, d: 4}); //=> {b: 2, d: 4}
     */
    // else
    var filter = _curry2(_dispatchable('filter', _xfilter, function (pred, filterable) {
        return _isObject(filterable) ? _reduce(function (acc, key) {
            if (pred(filterable[key])) {
                acc[key] = filterable[key];
            }
            return acc;
        }, {}, keys(filterable)) : // else
        _filter(pred, filterable);
    }));

    /**
     * Returns a new list by pulling every item out of it (and all its sub-arrays)
     * and putting them in a new array, depth-first.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig [a] -> [b]
     * @param {Array} list The array to consider.
     * @return {Array} The flattened list.
     * @see R.unnest
     * @example
     *
     *      R.flatten([1, 2, [3, 4], 5, [6, [7, 8, [9, [10, 11], 12]]]]);
     *      //=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]
     */
    var flatten = _curry1(_makeFlat(true));

    /**
     * Returns a new function much like the supplied one, except that the first two
     * arguments' order is reversed.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Function
     * @sig (a -> b -> c -> ... -> z) -> (b -> a -> c -> ... -> z)
     * @param {Function} fn The function to invoke with its first two parameters reversed.
     * @return {*} The result of invoking `fn` with its first two parameters' order reversed.
     * @example
     *
     *      var mergeThree = (a, b, c) => [].concat(a, b, c);
     *
     *      mergeThree(1, 2, 3); //=> [1, 2, 3]
     *
     *      R.flip(mergeThree)(1, 2, 3); //=> [2, 1, 3]
     */
    var flip = _curry1(function flip(fn) {
        return curry(function (a, b) {
            var args = _slice(arguments);
            args[0] = b;
            args[1] = a;
            return fn.apply(this, args);
        });
    });

    /**
     * Returns the first element of the given list or string. In some libraries
     * this function is named `first`.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig [a] -> a | Undefined
     * @sig String -> String
     * @param {Array|String} list
     * @return {*}
     * @see R.tail, R.init, R.last
     * @example
     *
     *      R.head(['fi', 'fo', 'fum']); //=> 'fi'
     *      R.head([]); //=> undefined
     *
     *      R.head('abc'); //=> 'a'
     *      R.head(''); //=> ''
     */
    var head = nth(0);

    /**
     * Returns all but the last element of the given list or string.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category List
     * @sig [a] -> [a]
     * @sig String -> String
     * @param {*} list
     * @return {*}
     * @see R.last, R.head, R.tail
     * @example
     *
     *      R.init([1, 2, 3]);  //=> [1, 2]
     *      R.init([1, 2]);     //=> [1]
     *      R.init([1]);        //=> []
     *      R.init([]);         //=> []
     *
     *      R.init('abc');  //=> 'ab'
     *      R.init('ab');   //=> 'a'
     *      R.init('a');    //=> ''
     *      R.init('');     //=> ''
     */
    var init = slice(0, -1);

    /**
     * Combines two lists into a set (i.e. no duplicates) composed of those
     * elements common to both lists. Duplication is determined according to the
     * value returned by applying the supplied predicate to two list elements.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Relation
     * @sig (a -> a -> Boolean) -> [*] -> [*] -> [*]
     * @param {Function} pred A predicate function that determines whether
     *        the two supplied elements are equal.
     * @param {Array} list1 One list of items to compare
     * @param {Array} list2 A second list of items to compare
     * @return {Array} A new list containing those elements common to both lists.
     * @see R.intersection
     * @example
     *
     *      var buffaloSpringfield = [
     *        {id: 824, name: 'Richie Furay'},
     *        {id: 956, name: 'Dewey Martin'},
     *        {id: 313, name: 'Bruce Palmer'},
     *        {id: 456, name: 'Stephen Stills'},
     *        {id: 177, name: 'Neil Young'}
     *      ];
     *      var csny = [
     *        {id: 204, name: 'David Crosby'},
     *        {id: 456, name: 'Stephen Stills'},
     *        {id: 539, name: 'Graham Nash'},
     *        {id: 177, name: 'Neil Young'}
     *      ];
     *
     *      R.intersectionWith(R.eqBy(R.prop('id')), buffaloSpringfield, csny);
     *      //=> [{id: 456, name: 'Stephen Stills'}, {id: 177, name: 'Neil Young'}]
     */
    var intersectionWith = _curry3(function intersectionWith(pred, list1, list2) {
        var lookupList, filteredList;
        if (list1.length > list2.length) {
            lookupList = list1;
            filteredList = list2;
        } else {
            lookupList = list2;
            filteredList = list1;
        }
        var results = [];
        var idx = 0;
        while (idx < filteredList.length) {
            if (_containsWith(pred, filteredList[idx], lookupList)) {
                results[results.length] = filteredList[idx];
            }
            idx += 1;
        }
        return uniqWith(pred, results);
    });

    /**
     * Transforms the items of the list with the transducer and appends the
     * transformed items to the accumulator using an appropriate iterator function
     * based on the accumulator type.
     *
     * The accumulator can be an array, string, object or a transformer. Iterated
     * items will be appended to arrays and concatenated to strings. Objects will
     * be merged directly or 2-item arrays will be merged as key, value pairs.
     *
     * The accumulator can also be a transformer object that provides a 2-arity
     * reducing iterator function, step, 0-arity initial value function, init, and
     * 1-arity result extraction function result. The step function is used as the
     * iterator function in reduce. The result function is used to convert the
     * final accumulator into the return type and in most cases is R.identity. The
     * init function is used to provide the initial accumulator.
     *
     * The iteration is performed with R.reduce after initializing the transducer.
     *
     * @func
     * @memberOf R
     * @since v0.12.0
     * @category List
     * @sig a -> (b -> b) -> [c] -> a
     * @param {*} acc The initial accumulator value.
     * @param {Function} xf The transducer function. Receives a transformer and returns a transformer.
     * @param {Array} list The list to iterate over.
     * @return {*} The final, accumulated value.
     * @example
     *
     *      var numbers = [1, 2, 3, 4];
     *      var transducer = R.compose(R.map(R.add(1)), R.take(2));
     *
     *      R.into([], transducer, numbers); //=> [2, 3]
     *
     *      var intoArray = R.into([]);
     *      intoArray(transducer, numbers); //=> [2, 3]
     */
    var into = _curry3(function into(acc, xf, list) {
        return _isTransformer(acc) ? _reduce(xf(acc), acc['@@transducer/init'](), list) : _reduce(xf(_stepCat(acc)), _clone(acc, [], [], false), list);
    });

    /**
     * Same as R.invertObj, however this accounts for objects with duplicate values
     * by putting the values into an array.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category Object
     * @sig {s: x} -> {x: [ s, ... ]}
     * @param {Object} obj The object or array to invert
     * @return {Object} out A new object with keys
     * in an array.
     * @example
     *
     *      var raceResultsByFirstName = {
     *        first: 'alice',
     *        second: 'jake',
     *        third: 'alice',
     *      };
     *      R.invert(raceResultsByFirstName);
     *      //=> { 'alice': ['first', 'third'], 'jake':['second'] }
     */
    var invert = _curry1(function invert(obj) {
        var props = keys(obj);
        var len = props.length;
        var idx = 0;
        var out = {};
        while (idx < len) {
            var key = props[idx];
            var val = obj[key];
            var list = _has(val, out) ? out[val] : out[val] = [];
            list[list.length] = key;
            idx += 1;
        }
        return out;
    });

    /**
     * Returns a new object with the keys of the given object as values, and the
     * values of the given object, which are coerced to strings, as keys. Note
     * that the last key found is preferred when handling the same value.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category Object
     * @sig {s: x} -> {x: s}
     * @param {Object} obj The object or array to invert
     * @return {Object} out A new object
     * @example
     *
     *      var raceResults = {
     *        first: 'alice',
     *        second: 'jake'
     *      };
     *      R.invertObj(raceResults);
     *      //=> { 'alice': 'first', 'jake':'second' }
     *
     *      // Alternatively:
     *      var raceResults = ['alice', 'jake'];
     *      R.invertObj(raceResults);
     *      //=> { 'alice': '0', 'jake':'1' }
     */
    var invertObj = _curry1(function invertObj(obj) {
        var props = keys(obj);
        var len = props.length;
        var idx = 0;
        var out = {};
        while (idx < len) {
            var key = props[idx];
            out[obj[key]] = key;
            idx += 1;
        }
        return out;
    });

    /**
     * Returns `true` if the given value is its type's empty value; `false`
     * otherwise.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Logic
     * @sig a -> Boolean
     * @param {*} x
     * @return {Boolean}
     * @see R.empty
     * @example
     *
     *      R.isEmpty([1, 2, 3]);   //=> false
     *      R.isEmpty([]);          //=> true
     *      R.isEmpty('');          //=> true
     *      R.isEmpty(null);        //=> false
     *      R.isEmpty({});          //=> true
     *      R.isEmpty({length: 0}); //=> false
     */
    var isEmpty = _curry1(function isEmpty(x) {
        return x != null && equals(x, empty(x));
    });

    /**
     * Returns the last element of the given list or string.
     *
     * @func
     * @memberOf R
     * @since v0.1.4
     * @category List
     * @sig [a] -> a | Undefined
     * @sig String -> String
     * @param {*} list
     * @return {*}
     * @see R.init, R.head, R.tail
     * @example
     *
     *      R.last(['fi', 'fo', 'fum']); //=> 'fum'
     *      R.last([]); //=> undefined
     *
     *      R.last('abc'); //=> 'c'
     *      R.last(''); //=> ''
     */
    var last = nth(-1);

    /**
     * Returns the position of the last occurrence of an item in an array, or -1 if
     * the item is not included in the array. `R.equals` is used to determine
     * equality.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig a -> [a] -> Number
     * @param {*} target The item to find.
     * @param {Array} xs The array to search in.
     * @return {Number} the index of the target, or -1 if the target is not found.
     * @see R.indexOf
     * @example
     *
     *      R.lastIndexOf(3, [-1,3,3,0,1,2,3,4]); //=> 6
     *      R.lastIndexOf(10, [1,2,3,4]); //=> -1
     */
    var lastIndexOf = _curry2(function lastIndexOf(target, xs) {
        if (typeof xs.lastIndexOf === 'function' && !_isArray(xs)) {
            return xs.lastIndexOf(target);
        } else {
            var idx = xs.length - 1;
            while (idx >= 0) {
                if (equals(xs[idx], target)) {
                    return idx;
                }
                idx -= 1;
            }
            return -1;
        }
    });

    /**
     * Takes a function and
     * a [functor](https://github.com/fantasyland/fantasy-land#functor),
     * applies the function to each of the functor's values, and returns
     * a functor of the same shape.
     *
     * Ramda provides suitable `map` implementations for `Array` and `Object`,
     * so this function may be applied to `[1, 2, 3]` or `{x: 1, y: 2, z: 3}`.
     *
     * Dispatches to the `map` method of the second argument, if present.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * Also treats functions as functors and will compose them together.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig Functor f => (a -> b) -> f a -> f b
     * @param {Function} fn The function to be called on every element of the input `list`.
     * @param {Array} list The list to be iterated over.
     * @return {Array} The new list.
     * @see R.transduce, R.addIndex
     * @example
     *
     *      var double = x => x * 2;
     *
     *      R.map(double, [1, 2, 3]); //=> [2, 4, 6]
     *
     *      R.map(double, {x: 1, y: 2, z: 3}); //=> {x: 2, y: 4, z: 6}
     */
    var map = _curry2(_dispatchable('map', _xmap, function map(fn, functor) {
        switch (Object.prototype.toString.call(functor)) {
        case '[object Function]':
            return curryN(functor.length, function () {
                return fn.call(this, functor.apply(this, arguments));
            });
        case '[object Object]':
            return _reduce(function (acc, key) {
                acc[key] = fn(functor[key]);
                return acc;
            }, {}, keys(functor));
        default:
            return _map(fn, functor);
        }
    }));

    /**
     * An Object-specific version of `map`. The function is applied to three
     * arguments: *(value, key, obj)*. If only the value is significant, use
     * `map` instead.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category Object
     * @sig ((*, String, Object) -> *) -> Object -> Object
     * @param {Function} fn
     * @param {Object} obj
     * @return {Object}
     * @see R.map
     * @example
     *
     *      var values = { x: 1, y: 2, z: 3 };
     *      var prependKeyAndDouble = (num, key, obj) => key + (num * 2);
     *
     *      R.mapObjIndexed(prependKeyAndDouble, values); //=> { x: 'x2', y: 'y4', z: 'z6' }
     */
    var mapObjIndexed = _curry2(function mapObjIndexed(fn, obj) {
        return _reduce(function (acc, key) {
            acc[key] = fn(obj[key], key, obj);
            return acc;
        }, {}, keys(obj));
    });

    /**
     * Creates a new object with the own properties of the two provided objects. If
     * a key exists in both objects, the provided function is applied to the values
     * associated with the key in each object, with the result being used as the
     * value associated with the key in the returned object. The key will be
     * excluded from the returned object if the resulting value is `undefined`.
     *
     * @func
     * @memberOf R
     * @since v0.19.0
     * @category Object
     * @sig (a -> a -> a) -> {a} -> {a} -> {a}
     * @param {Function} fn
     * @param {Object} l
     * @param {Object} r
     * @return {Object}
     * @see R.merge, R.mergeWithKey
     * @example
     *
     *      R.mergeWith(R.concat,
     *                  { a: true, values: [10, 20] },
     *                  { b: true, values: [15, 35] });
     *      //=> { a: true, b: true, values: [10, 20, 15, 35] }
     */
    var mergeWith = _curry3(function mergeWith(fn, l, r) {
        return mergeWithKey(function (_, _l, _r) {
            return fn(_l, _r);
        }, l, r);
    });

    /**
     * Takes a function `f` and a list of arguments, and returns a function `g`.
     * When applied, `g` returns the result of applying `f` to the arguments
     * provided initially followed by the arguments provided to `g`.
     *
     * @func
     * @memberOf R
     * @since v0.10.0
     * @category Function
     * @sig ((a, b, c, ..., n) -> x) -> [a, b, c, ...] -> ((d, e, f, ..., n) -> x)
     * @param {Function} f
     * @param {Array} args
     * @return {Function}
     * @see R.partialRight
     * @example
     *
     *      var multiply = (a, b) => a * b;
     *      var double = R.partial(multiply, [2]);
     *      double(2); //=> 4
     *
     *      var greet = (salutation, title, firstName, lastName) =>
     *        salutation + ', ' + title + ' ' + firstName + ' ' + lastName + '!';
     *
     *      var sayHello = R.partial(greet, ['Hello']);
     *      var sayHelloToMs = R.partial(sayHello, ['Ms.']);
     *      sayHelloToMs('Jane', 'Jones'); //=> 'Hello, Ms. Jane Jones!'
     */
    var partial = _createPartialApplicator(_concat);

    /**
     * Takes a function `f` and a list of arguments, and returns a function `g`.
     * When applied, `g` returns the result of applying `f` to the arguments
     * provided to `g` followed by the arguments provided initially.
     *
     * @func
     * @memberOf R
     * @since v0.10.0
     * @category Function
     * @sig ((a, b, c, ..., n) -> x) -> [d, e, f, ..., n] -> ((a, b, c, ...) -> x)
     * @param {Function} f
     * @param {Array} args
     * @return {Function}
     * @see R.partial
     * @example
     *
     *      var greet = (salutation, title, firstName, lastName) =>
     *        salutation + ', ' + title + ' ' + firstName + ' ' + lastName + '!';
     *
     *      var greetMsJaneJones = R.partialRight(greet, ['Ms.', 'Jane', 'Jones']);
     *
     *      greetMsJaneJones('Hello'); //=> 'Hello, Ms. Jane Jones!'
     */
    var partialRight = _createPartialApplicator(flip(_concat));

    /**
     * Determines whether a nested path on an object has a specific value, in
     * `R.equals` terms. Most likely used to filter a list.
     *
     * @func
     * @memberOf R
     * @since v0.7.0
     * @category Relation
     * @sig [String] -> * -> {String: *} -> Boolean
     * @param {Array} path The path of the nested property to use
     * @param {*} val The value to compare the nested property with
     * @param {Object} obj The object to check the nested property in
     * @return {Boolean} `true` if the value equals the nested object property,
     *         `false` otherwise.
     * @example
     *
     *      var user1 = { address: { zipCode: 90210 } };
     *      var user2 = { address: { zipCode: 55555 } };
     *      var user3 = { name: 'Bob' };
     *      var users = [ user1, user2, user3 ];
     *      var isFamous = R.pathEq(['address', 'zipCode'], 90210);
     *      R.filter(isFamous, users); //=> [ user1 ]
     */
    var pathEq = _curry3(function pathEq(_path, val, obj) {
        return equals(path(_path, obj), val);
    });

    /**
     * Returns a new list by plucking the same named property off all objects in
     * the list supplied.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig k -> [{k: v}] -> [v]
     * @param {Number|String} key The key name to pluck off of each object.
     * @param {Array} list The array to consider.
     * @return {Array} The list of values for the given key.
     * @see R.props
     * @example
     *
     *      R.pluck('a')([{a: 1}, {a: 2}]); //=> [1, 2]
     *      R.pluck(0)([[1, 2], [3, 4]]);   //=> [1, 3]
     */
    var pluck = _curry2(function pluck(p, list) {
        return map(prop(p), list);
    });

    /**
     * Reasonable analog to SQL `select` statement.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Object
     * @category Relation
     * @sig [k] -> [{k: v}] -> [{k: v}]
     * @param {Array} props The property names to project
     * @param {Array} objs The objects to query
     * @return {Array} An array of objects with just the `props` properties.
     * @example
     *
     *      var abby = {name: 'Abby', age: 7, hair: 'blond', grade: 2};
     *      var fred = {name: 'Fred', age: 12, hair: 'brown', grade: 7};
     *      var kids = [abby, fred];
     *      R.project(['name', 'grade'], kids); //=> [{name: 'Abby', grade: 2}, {name: 'Fred', grade: 7}]
     */
    // passing `identity` gives correct arity
    var project = useWith(_map, [
        pickAll,
        identity
    ]);

    /**
     * Returns `true` if the specified object property is equal, in `R.equals`
     * terms, to the given value; `false` otherwise.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Relation
     * @sig String -> a -> Object -> Boolean
     * @param {String} name
     * @param {*} val
     * @param {*} obj
     * @return {Boolean}
     * @see R.equals, R.propSatisfies
     * @example
     *
     *      var abby = {name: 'Abby', age: 7, hair: 'blond'};
     *      var fred = {name: 'Fred', age: 12, hair: 'brown'};
     *      var rusty = {name: 'Rusty', age: 10, hair: 'brown'};
     *      var alois = {name: 'Alois', age: 15, disposition: 'surly'};
     *      var kids = [abby, fred, rusty, alois];
     *      var hasBrownHair = R.propEq('hair', 'brown');
     *      R.filter(hasBrownHair, kids); //=> [fred, rusty]
     */
    var propEq = _curry3(function propEq(name, val, obj) {
        return equals(val, obj[name]);
    });

    /**
     * Returns a single item by iterating through the list, successively calling
     * the iterator function and passing it an accumulator value and the current
     * value from the array, and then passing the result to the next call.
     *
     * The iterator function receives two values: *(acc, value)*. It may use
     * `R.reduced` to shortcut the iteration.
     *
     * Note: `R.reduce` does not skip deleted or unassigned indices (sparse
     * arrays), unlike the native `Array.prototype.reduce` method. For more details
     * on this behavior, see:
     * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce#Description
     *
     * Dispatches to the `reduce` method of the third argument, if present.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig ((a, b) -> a) -> a -> [b] -> a
     * @param {Function} fn The iterator function. Receives two values, the accumulator and the
     *        current element from the array.
     * @param {*} acc The accumulator value.
     * @param {Array} list The list to iterate over.
     * @return {*} The final, accumulated value.
     * @see R.reduced, R.addIndex
     * @example
     *
     *      var numbers = [1, 2, 3];
     *      var plus = (a, b) => a + b;
     *
     *      R.reduce(plus, 10, numbers); //=> 16
     */
    var reduce = _curry3(_reduce);

    /**
     * Groups the elements of the list according to the result of calling
     * the String-returning function `keyFn` on each element and reduces the elements
     * of each group to a single value via the reducer function `valueFn`.
     *
     * This function is basically a more general `groupBy` function.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.20.0
     * @category List
     * @sig ((a, b) -> a) -> a -> (b -> String) -> [b] -> {String: a}
     * @param {Function} valueFn The function that reduces the elements of each group to a single
     *        value. Receives two values, accumulator for a particular group and the current element.
     * @param {*} acc The (initial) accumulator value for each group.
     * @param {Function} keyFn The function that maps the list's element into a key.
     * @param {Array} list The array to group.
     * @return {Object} An object with the output of `keyFn` for keys, mapped to the output of
     *         `valueFn` for elements which produced that key when passed to `keyFn`.
     * @see R.groupBy, R.reduce
     * @example
     *
     *      var reduceToNamesBy = R.reduceBy((acc, student) => acc.concat(student.name), []);
     *      var namesByGrade = reduceToNamesBy(function(student) {
     *        var score = student.score;
     *        return score < 65 ? 'F' :
     *               score < 70 ? 'D' :
     *               score < 80 ? 'C' :
     *               score < 90 ? 'B' : 'A';
     *      });
     *      var students = [{name: 'Lucy', score: 92},
     *                      {name: 'Drew', score: 85},
     *                      // ...
     *                      {name: 'Bart', score: 62}];
     *      namesByGrade(students);
     *      // {
     *      //   'A': ['Lucy'],
     *      //   'B': ['Drew']
     *      //   // ...,
     *      //   'F': ['Bart']
     *      // }
     */
    var reduceBy = _curryN(4, [], _dispatchable('reduceBy', _xreduceBy, function reduceBy(valueFn, valueAcc, keyFn, list) {
        return _reduce(function (acc, elt) {
            var key = keyFn(elt);
            acc[key] = valueFn(_has(key, acc) ? acc[key] : valueAcc, elt);
            return acc;
        }, {}, list);
    }));

    /**
     * Like `reduce`, `reduceWhile` returns a single item by iterating through
     * the list, successively calling the iterator function. `reduceWhile` also
     * takes a predicate that is evaluated before each step. If the predicate returns
     * `false`, it "short-circuits" the iteration and returns the current value
     * of the accumulator.
     *
     * @func
     * @memberOf R
     * @since v0.22.0
     * @category List
     * @sig ((a, b) -> Boolean) -> ((a, b) -> a) -> a -> [b] -> a
     * @param {Function} pred The predicate. It is passed the accumulator and the
     *        current element.
     * @param {Function} fn The iterator function. Receives two values, the
     *        accumulator and the current element.
     * @param {*} a The accumulator value.
     * @param {Array} list The list to iterate over.
     * @return {*} The final, accumulated value.
     * @see R.reduce, R.reduced
     * @example
     *
     *      var isOdd = (acc, x) => x % 2 === 1;
     *      var xs = [1, 3, 5, 60, 777, 800];
     *      R.reduceWhile(isOdd, R.add, 0, xs); //=> 9
     *
     *      var ys = [2, 4, 6]
     *      R.reduceWhile(isOdd, R.add, 111, ys); //=> 111
     */
    var reduceWhile = _curryN(4, [], function _reduceWhile(pred, fn, a, list) {
        return _reduce(function (acc, x) {
            return pred(acc, x) ? fn(acc, x) : _reduced(acc);
        }, a, list);
    });

    /**
     * The complement of `filter`.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig Filterable f => (a -> Boolean) -> f a -> f a
     * @param {Function} pred
     * @param {Array} filterable
     * @return {Array}
     * @see R.filter, R.transduce, R.addIndex
     * @example
     *
     *      var isOdd = (n) => n % 2 === 1;
     *
     *      R.reject(isOdd, [1, 2, 3, 4]); //=> [2, 4]
     *
     *      R.reject(isOdd, {a: 1, b: 2, c: 3, d: 4}); //=> {b: 2, d: 4}
     */
    var reject = _curry2(function reject(pred, filterable) {
        return filter(_complement(pred), filterable);
    });

    /**
     * Returns a fixed list of size `n` containing a specified identical value.
     *
     * @func
     * @memberOf R
     * @since v0.1.1
     * @category List
     * @sig a -> n -> [a]
     * @param {*} value The value to repeat.
     * @param {Number} n The desired size of the output list.
     * @return {Array} A new array containing `n` `value`s.
     * @example
     *
     *      R.repeat('hi', 5); //=> ['hi', 'hi', 'hi', 'hi', 'hi']
     *
     *      var obj = {};
     *      var repeatedObjs = R.repeat(obj, 5); //=> [{}, {}, {}, {}, {}]
     *      repeatedObjs[0] === repeatedObjs[1]; //=> true
     */
    var repeat = _curry2(function repeat(value, n) {
        return times(always(value), n);
    });

    /**
     * Adds together all the elements of a list.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Math
     * @sig [Number] -> Number
     * @param {Array} list An array of numbers
     * @return {Number} The sum of all the numbers in the list.
     * @see R.reduce
     * @example
     *
     *      R.sum([2,4,6,8,100,1]); //=> 121
     */
    var sum = reduce(add, 0);

    /**
     * Returns a new list containing the last `n` elements of the given list.
     * If `n > list.length`, returns a list of `list.length` elements.
     *
     * @func
     * @memberOf R
     * @since v0.16.0
     * @category List
     * @sig Number -> [a] -> [a]
     * @sig Number -> String -> String
     * @param {Number} n The number of elements to return.
     * @param {Array} xs The collection to consider.
     * @return {Array}
     * @see R.dropLast
     * @example
     *
     *      R.takeLast(1, ['foo', 'bar', 'baz']); //=> ['baz']
     *      R.takeLast(2, ['foo', 'bar', 'baz']); //=> ['bar', 'baz']
     *      R.takeLast(3, ['foo', 'bar', 'baz']); //=> ['foo', 'bar', 'baz']
     *      R.takeLast(4, ['foo', 'bar', 'baz']); //=> ['foo', 'bar', 'baz']
     *      R.takeLast(3, 'ramda');               //=> 'mda'
     */
    var takeLast = _curry2(function takeLast(n, xs) {
        return drop(n >= 0 ? xs.length - n : 0, xs);
    });

    /**
     * Initializes a transducer using supplied iterator function. Returns a single
     * item by iterating through the list, successively calling the transformed
     * iterator function and passing it an accumulator value and the current value
     * from the array, and then passing the result to the next call.
     *
     * The iterator function receives two values: *(acc, value)*. It will be
     * wrapped as a transformer to initialize the transducer. A transformer can be
     * passed directly in place of an iterator function. In both cases, iteration
     * may be stopped early with the `R.reduced` function.
     *
     * A transducer is a function that accepts a transformer and returns a
     * transformer and can be composed directly.
     *
     * A transformer is an an object that provides a 2-arity reducing iterator
     * function, step, 0-arity initial value function, init, and 1-arity result
     * extraction function, result. The step function is used as the iterator
     * function in reduce. The result function is used to convert the final
     * accumulator into the return type and in most cases is R.identity. The init
     * function can be used to provide an initial accumulator, but is ignored by
     * transduce.
     *
     * The iteration is performed with R.reduce after initializing the transducer.
     *
     * @func
     * @memberOf R
     * @since v0.12.0
     * @category List
     * @sig (c -> c) -> (a,b -> a) -> a -> [b] -> a
     * @param {Function} xf The transducer function. Receives a transformer and returns a transformer.
     * @param {Function} fn The iterator function. Receives two values, the accumulator and the
     *        current element from the array. Wrapped as transformer, if necessary, and used to
     *        initialize the transducer
     * @param {*} acc The initial accumulator value.
     * @param {Array} list The list to iterate over.
     * @return {*} The final, accumulated value.
     * @see R.reduce, R.reduced, R.into
     * @example
     *
     *      var numbers = [1, 2, 3, 4];
     *      var transducer = R.compose(R.map(R.add(1)), R.take(2));
     *
     *      R.transduce(transducer, R.flip(R.append), [], numbers); //=> [2, 3]
     */
    var transduce = curryN(4, function transduce(xf, fn, acc, list) {
        return _reduce(xf(typeof fn === 'function' ? _xwrap(fn) : fn), acc, list);
    });

    /**
     * Combines two lists into a set (i.e. no duplicates) composed of the elements
     * of each list. Duplication is determined according to the value returned by
     * applying the supplied predicate to two list elements.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Relation
     * @sig (a -> a -> Boolean) -> [*] -> [*] -> [*]
     * @param {Function} pred A predicate used to test whether two items are equal.
     * @param {Array} list1 The first list.
     * @param {Array} list2 The second list.
     * @return {Array} The first and second lists concatenated, with
     *         duplicates removed.
     * @see R.union
     * @example
     *
     *      var l1 = [{a: 1}, {a: 2}];
     *      var l2 = [{a: 1}, {a: 4}];
     *      R.unionWith(R.eqBy(R.prop('a')), l1, l2); //=> [{a: 1}, {a: 2}, {a: 4}]
     */
    var unionWith = _curry3(function unionWith(pred, list1, list2) {
        return uniqWith(pred, _concat(list1, list2));
    });

    /**
     * Takes a spec object and a test object; returns true if the test satisfies
     * the spec, false otherwise. An object satisfies the spec if, for each of the
     * spec's own properties, accessing that property of the object gives the same
     * value (in `R.equals` terms) as accessing that property of the spec.
     *
     * `whereEq` is a specialization of [`where`](#where).
     *
     * @func
     * @memberOf R
     * @since v0.14.0
     * @category Object
     * @sig {String: *} -> {String: *} -> Boolean
     * @param {Object} spec
     * @param {Object} testObj
     * @return {Boolean}
     * @see R.where
     * @example
     *
     *      // pred :: Object -> Boolean
     *      var pred = R.whereEq({a: 1, b: 2});
     *
     *      pred({a: 1});              //=> false
     *      pred({a: 1, b: 2});        //=> true
     *      pred({a: 1, b: 2, c: 3});  //=> true
     *      pred({a: 1, b: 1});        //=> false
     */
    var whereEq = _curry2(function whereEq(spec, testObj) {
        return where(map(equals, spec), testObj);
    });

    var _flatCat = function () {
        var preservingReduced = function (xf) {
            return {
                '@@transducer/init': _xfBase.init,
                '@@transducer/result': function (result) {
                    return xf['@@transducer/result'](result);
                },
                '@@transducer/step': function (result, input) {
                    var ret = xf['@@transducer/step'](result, input);
                    return ret['@@transducer/reduced'] ? _forceReduced(ret) : ret;
                }
            };
        };
        return function _xcat(xf) {
            var rxf = preservingReduced(xf);
            return {
                '@@transducer/init': _xfBase.init,
                '@@transducer/result': function (result) {
                    return rxf['@@transducer/result'](result);
                },
                '@@transducer/step': function (result, input) {
                    return !isArrayLike(input) ? _reduce(rxf, result, [input]) : _reduce(rxf, result, input);
                }
            };
        };
    }();

    // Array.prototype.indexOf doesn't exist below IE9
    // manually crawl the list to distinguish between +0 and -0
    // NaN
    // non-zero numbers can utilise Set
    // all these types can utilise Set
    // null can utilise Set
    // anything else not covered above, defer to R.equals
    var _indexOf = function _indexOf(list, a, idx) {
        var inf, item;
        // Array.prototype.indexOf doesn't exist below IE9
        if (typeof list.indexOf === 'function') {
            switch (typeof a) {
            case 'number':
                if (a === 0) {
                    // manually crawl the list to distinguish between +0 and -0
                    inf = 1 / a;
                    while (idx < list.length) {
                        item = list[idx];
                        if (item === 0 && 1 / item === inf) {
                            return idx;
                        }
                        idx += 1;
                    }
                    return -1;
                } else if (a !== a) {
                    // NaN
                    while (idx < list.length) {
                        item = list[idx];
                        if (typeof item === 'number' && item !== item) {
                            return idx;
                        }
                        idx += 1;
                    }
                    return -1;
                }
                // non-zero numbers can utilise Set
                return list.indexOf(a, idx);
            // all these types can utilise Set
            case 'string':
            case 'boolean':
            case 'function':
            case 'undefined':
                return list.indexOf(a, idx);
            case 'object':
                if (a === null) {
                    // null can utilise Set
                    return list.indexOf(a, idx);
                }
            }
        }
        // anything else not covered above, defer to R.equals
        while (idx < list.length) {
            if (equals(list[idx], a)) {
                return idx;
            }
            idx += 1;
        }
        return -1;
    };

    var _xchain = _curry2(function _xchain(f, xf) {
        return map(f, _flatCat(xf));
    });

    /**
     * Takes a list of predicates and returns a predicate that returns true for a
     * given list of arguments if every one of the provided predicates is satisfied
     * by those arguments.
     *
     * The function returned is a curried function whose arity matches that of the
     * highest-arity predicate.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category Logic
     * @sig [(*... -> Boolean)] -> (*... -> Boolean)
     * @param {Array} preds
     * @return {Function}
     * @see R.anyPass
     * @example
     *
     *      var isQueen = R.propEq('rank', 'Q');
     *      var isSpade = R.propEq('suit', '♠︎');
     *      var isQueenOfSpades = R.allPass([isQueen, isSpade]);
     *
     *      isQueenOfSpades({rank: 'Q', suit: '♣︎'}); //=> false
     *      isQueenOfSpades({rank: 'Q', suit: '♠︎'}); //=> true
     */
    var allPass = _curry1(function allPass(preds) {
        return curryN(reduce(max, 0, pluck('length', preds)), function () {
            var idx = 0;
            var len = preds.length;
            while (idx < len) {
                if (!preds[idx].apply(this, arguments)) {
                    return false;
                }
                idx += 1;
            }
            return true;
        });
    });

    /**
     * Takes a list of predicates and returns a predicate that returns true for a
     * given list of arguments if at least one of the provided predicates is
     * satisfied by those arguments.
     *
     * The function returned is a curried function whose arity matches that of the
     * highest-arity predicate.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category Logic
     * @sig [(*... -> Boolean)] -> (*... -> Boolean)
     * @param {Array} preds
     * @return {Function}
     * @see R.allPass
     * @example
     *
     *      var gte = R.anyPass([R.gt, R.equals]);
     *
     *      gte(3, 2); //=> true
     *      gte(2, 2); //=> true
     *      gte(2, 3); //=> false
     */
    var anyPass = _curry1(function anyPass(preds) {
        return curryN(reduce(max, 0, pluck('length', preds)), function () {
            var idx = 0;
            var len = preds.length;
            while (idx < len) {
                if (preds[idx].apply(this, arguments)) {
                    return true;
                }
                idx += 1;
            }
            return false;
        });
    });

    /**
     * ap applies a list of functions to a list of values.
     *
     * Dispatches to the `ap` method of the second argument, if present. Also
     * treats curried functions as applicatives.
     *
     * @func
     * @memberOf R
     * @since v0.3.0
     * @category Function
     * @sig [a -> b] -> [a] -> [b]
     * @sig Apply f => f (a -> b) -> f a -> f b
     * @param {Array} fns An array of functions
     * @param {Array} vs An array of values
     * @return {Array} An array of results of applying each of `fns` to all of `vs` in turn.
     * @example
     *
     *      R.ap([R.multiply(2), R.add(3)], [1,2,3]); //=> [2, 4, 6, 4, 5, 6]
     */
    // else
    var ap = _curry2(function ap(applicative, fn) {
        return typeof applicative.ap === 'function' ? applicative.ap(fn) : typeof applicative === 'function' ? function (x) {
            return applicative(x)(fn(x));
        } : // else
        _reduce(function (acc, f) {
            return _concat(acc, map(f, fn));
        }, [], applicative);
    });

    /**
     * Given a spec object recursively mapping properties to functions, creates a
     * function producing an object of the same structure, by mapping each property
     * to the result of calling its associated function with the supplied arguments.
     *
     * @func
     * @memberOf R
     * @since v0.20.0
     * @category Function
     * @sig {k: ((a, b, ..., m) -> v)} -> ((a, b, ..., m) -> {k: v})
     * @param {Object} spec an object recursively mapping properties to functions for
     *        producing the values for these properties.
     * @return {Function} A function that returns an object of the same structure
     * as `spec', with each property set to the value returned by calling its
     * associated function with the supplied arguments.
     * @see R.converge, R.juxt
     * @example
     *
     *      var getMetrics = R.applySpec({
     *                                      sum: R.add,
     *                                      nested: { mul: R.multiply }
     *                                   });
     *      getMetrics(2, 4); // => { sum: 6, nested: { mul: 8 } }
     */
    var applySpec = _curry1(function applySpec(spec) {
        spec = map(function (v) {
            return typeof v == 'function' ? v : applySpec(v);
        }, spec);
        return curryN(reduce(max, 0, pluck('length', values(spec))), function () {
            var args = arguments;
            return map(function (f) {
                return apply(f, args);
            }, spec);
        });
    });

    /**
     * Returns the result of calling its first argument with the remaining
     * arguments. This is occasionally useful as a converging function for
     * `R.converge`: the left branch can produce a function while the right branch
     * produces a value to be passed to that function as an argument.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category Function
     * @sig (*... -> a),*... -> a
     * @param {Function} fn The function to apply to the remaining arguments.
     * @param {...*} args Any number of positional arguments.
     * @return {*}
     * @see R.apply
     * @example
     *
     *      var indentN = R.pipe(R.times(R.always(' ')),
     *                           R.join(''),
     *                           R.replace(/^(?!$)/gm));
     *
     *      var format = R.converge(R.call, [
     *                                  R.pipe(R.prop('indent'), indentN),
     *                                  R.prop('value')
     *                              ]);
     *
     *      format({indent: 2, value: 'foo\nbar\nbaz\n'}); //=> '  foo\n  bar\n  baz\n'
     */
    var call = curry(function call(fn) {
        return fn.apply(this, _slice(arguments, 1));
    });

    /**
     * `chain` maps a function over a list and concatenates the results. `chain`
     * is also known as `flatMap` in some libraries
     *
     * Dispatches to the `chain` method of the second argument, if present,
     * according to the [FantasyLand Chain spec](https://github.com/fantasyland/fantasy-land#chain).
     *
     * @func
     * @memberOf R
     * @since v0.3.0
     * @category List
     * @sig Chain m => (a -> m b) -> m a -> m b
     * @param {Function} fn
     * @param {Array} list
     * @return {Array}
     * @example
     *
     *      var duplicate = n => [n, n];
     *      R.chain(duplicate, [1, 2, 3]); //=> [1, 1, 2, 2, 3, 3]
     */
    var chain = _curry2(_dispatchable('chain', _xchain, function chain(fn, monad) {
        if (typeof monad === 'function') {
            return function () {
                return monad.call(this, fn.apply(this, arguments)).apply(this, arguments);
            };
        }
        return _makeFlat(false)(map(fn, monad));
    }));

    /**
     * Returns a function, `fn`, which encapsulates if/else-if/else logic.
     * `R.cond` takes a list of [predicate, transform] pairs. All of the arguments
     * to `fn` are applied to each of the predicates in turn until one returns a
     * "truthy" value, at which point `fn` returns the result of applying its
     * arguments to the corresponding transformer. If none of the predicates
     * matches, `fn` returns undefined.
     *
     * @func
     * @memberOf R
     * @since v0.6.0
     * @category Logic
     * @sig [[(*... -> Boolean),(*... -> *)]] -> (*... -> *)
     * @param {Array} pairs
     * @return {Function}
     * @example
     *
     *      var fn = R.cond([
     *        [R.equals(0),   R.always('water freezes at 0°C')],
     *        [R.equals(100), R.always('water boils at 100°C')],
     *        [R.T,           temp => 'nothing special happens at ' + temp + '°C']
     *      ]);
     *      fn(0); //=> 'water freezes at 0°C'
     *      fn(50); //=> 'nothing special happens at 50°C'
     *      fn(100); //=> 'water boils at 100°C'
     */
    var cond = _curry1(function cond(pairs) {
        var arity = reduce(max, 0, map(function (pair) {
            return pair[0].length;
        }, pairs));
        return _arity(arity, function () {
            var idx = 0;
            while (idx < pairs.length) {
                if (pairs[idx][0].apply(this, arguments)) {
                    return pairs[idx][1].apply(this, arguments);
                }
                idx += 1;
            }
        });
    });

    /**
     * Wraps a constructor function inside a curried function that can be called
     * with the same arguments and returns the same type. The arity of the function
     * returned is specified to allow using variadic constructor functions.
     *
     * @func
     * @memberOf R
     * @since v0.4.0
     * @category Function
     * @sig Number -> (* -> {*}) -> (* -> {*})
     * @param {Number} n The arity of the constructor function.
     * @param {Function} Fn The constructor function to wrap.
     * @return {Function} A wrapped, curried constructor function.
     * @example
     *
     *      // Variadic constructor function
     *      var Widget = () => {
     *        this.children = Array.prototype.slice.call(arguments);
     *        // ...
     *      };
     *      Widget.prototype = {
     *        // ...
     *      };
     *      var allConfigs = [
     *        // ...
     *      ];
     *      R.map(R.constructN(1, Widget), allConfigs); // a list of Widgets
     */
    var constructN = _curry2(function constructN(n, Fn) {
        if (n > 10) {
            throw new Error('Constructor with greater than ten arguments');
        }
        if (n === 0) {
            return function () {
                return new Fn();
            };
        }
        return curry(nAry(n, function ($0, $1, $2, $3, $4, $5, $6, $7, $8, $9) {
            switch (arguments.length) {
            case 1:
                return new Fn($0);
            case 2:
                return new Fn($0, $1);
            case 3:
                return new Fn($0, $1, $2);
            case 4:
                return new Fn($0, $1, $2, $3);
            case 5:
                return new Fn($0, $1, $2, $3, $4);
            case 6:
                return new Fn($0, $1, $2, $3, $4, $5);
            case 7:
                return new Fn($0, $1, $2, $3, $4, $5, $6);
            case 8:
                return new Fn($0, $1, $2, $3, $4, $5, $6, $7);
            case 9:
                return new Fn($0, $1, $2, $3, $4, $5, $6, $7, $8);
            case 10:
                return new Fn($0, $1, $2, $3, $4, $5, $6, $7, $8, $9);
            }
        }));
    });

    /**
     * Accepts a converging function and a list of branching functions and returns
     * a new function. When invoked, this new function is applied to some
     * arguments, each branching function is applied to those same arguments. The
     * results of each branching function are passed as arguments to the converging
     * function to produce the return value.
     *
     * @func
     * @memberOf R
     * @since v0.4.2
     * @category Function
     * @sig (x1 -> x2 -> ... -> z) -> [(a -> b -> ... -> x1), (a -> b -> ... -> x2), ...] -> (a -> b -> ... -> z)
     * @param {Function} after A function. `after` will be invoked with the return values of
     *        `fn1` and `fn2` as its arguments.
     * @param {Array} functions A list of functions.
     * @return {Function} A new function.
     * @example
     *
     *      var add = (a, b) => a + b;
     *      var multiply = (a, b) => a * b;
     *      var subtract = (a, b) => a - b;
     *
     *      //≅ multiply( add(1, 2), subtract(1, 2) );
     *      R.converge(multiply, [add, subtract])(1, 2); //=> -3
     *
     *      var add3 = (a, b, c) => a + b + c;
     *      R.converge(add3, [multiply, add, subtract])(1, 2); //=> 4
     */
    var converge = _curry2(function converge(after, fns) {
        return curryN(reduce(max, 0, pluck('length', fns)), function () {
            var args = arguments;
            var context = this;
            return after.apply(context, _map(function (fn) {
                return fn.apply(context, args);
            }, fns));
        });
    });

    /**
     * Counts the elements of a list according to how many match each value of a
     * key generated by the supplied function. Returns an object mapping the keys
     * produced by `fn` to the number of occurrences in the list. Note that all
     * keys are coerced to strings because of how JavaScript objects work.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Relation
     * @sig (a -> String) -> [a] -> {*}
     * @param {Function} fn The function used to map values to keys.
     * @param {Array} list The list to count elements from.
     * @return {Object} An object mapping keys to number of occurrences in the list.
     * @example
     *
     *      var numbers = [1.0, 1.1, 1.2, 2.0, 3.0, 2.2];
     *      var letters = R.split('', 'abcABCaaaBBc');
     *      R.countBy(Math.floor)(numbers);    //=> {'1': 3, '2': 2, '3': 1}
     *      R.countBy(R.toLower)(letters);   //=> {'a': 5, 'b': 4, 'c': 3}
     */
    var countBy = reduceBy(function (acc, elem) {
        return acc + 1;
    }, 0);

    /**
     * Returns a new list without any consecutively repeating elements. Equality is
     * determined by applying the supplied predicate two consecutive elements. The
     * first element in a series of equal element is the one being preserved.
     *
     * Dispatches to the `dropRepeatsWith` method of the second argument, if present.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.14.0
     * @category List
     * @sig (a, a -> Boolean) -> [a] -> [a]
     * @param {Function} pred A predicate used to test whether two items are equal.
     * @param {Array} list The array to consider.
     * @return {Array} `list` without repeating elements.
     * @see R.transduce
     * @example
     *
     *      var l = [1, -1, 1, 3, 4, -4, -4, -5, 5, 3, 3];
     *      R.dropRepeatsWith(R.eqBy(Math.abs), l); //=> [1, 3, 4, -5, 3]
     */
    var dropRepeatsWith = _curry2(_dispatchable('dropRepeatsWith', _xdropRepeatsWith, function dropRepeatsWith(pred, list) {
        var result = [];
        var idx = 1;
        var len = list.length;
        if (len !== 0) {
            result[0] = list[0];
            while (idx < len) {
                if (!pred(last(result), list[idx])) {
                    result[result.length] = list[idx];
                }
                idx += 1;
            }
        }
        return result;
    }));

    /**
     * Takes a function and two values in its domain and returns `true` if the
     * values map to the same value in the codomain; `false` otherwise.
     *
     * @func
     * @memberOf R
     * @since v0.18.0
     * @category Relation
     * @sig (a -> b) -> a -> a -> Boolean
     * @param {Function} f
     * @param {*} x
     * @param {*} y
     * @return {Boolean}
     * @example
     *
     *      R.eqBy(Math.abs, 5, -5); //=> true
     */
    var eqBy = _curry3(function eqBy(f, x, y) {
        return equals(f(x), f(y));
    });

    /**
     * Reports whether two objects have the same value, in `R.equals` terms, for
     * the specified property. Useful as a curried predicate.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Object
     * @sig k -> {k: v} -> {k: v} -> Boolean
     * @param {String} prop The name of the property to compare
     * @param {Object} obj1
     * @param {Object} obj2
     * @return {Boolean}
     *
     * @example
     *
     *      var o1 = { a: 1, b: 2, c: 3, d: 4 };
     *      var o2 = { a: 10, b: 20, c: 3, d: 40 };
     *      R.eqProps('a', o1, o2); //=> false
     *      R.eqProps('c', o1, o2); //=> true
     */
    var eqProps = _curry3(function eqProps(prop, obj1, obj2) {
        return equals(obj1[prop], obj2[prop]);
    });

    /**
     * Splits a list into sub-lists stored in an object, based on the result of
     * calling a String-returning function on each element, and grouping the
     * results according to values returned.
     *
     * Dispatches to the `groupBy` method of the second argument, if present.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig (a -> String) -> [a] -> {String: [a]}
     * @param {Function} fn Function :: a -> String
     * @param {Array} list The array to group
     * @return {Object} An object with the output of `fn` for keys, mapped to arrays of elements
     *         that produced that key when passed to `fn`.
     * @see R.transduce
     * @example
     *
     *      var byGrade = R.groupBy(function(student) {
     *        var score = student.score;
     *        return score < 65 ? 'F' :
     *               score < 70 ? 'D' :
     *               score < 80 ? 'C' :
     *               score < 90 ? 'B' : 'A';
     *      });
     *      var students = [{name: 'Abby', score: 84},
     *                      {name: 'Eddy', score: 58},
     *                      // ...
     *                      {name: 'Jack', score: 69}];
     *      byGrade(students);
     *      // {
     *      //   'A': [{name: 'Dianne', score: 99}],
     *      //   'B': [{name: 'Abby', score: 84}]
     *      //   // ...,
     *      //   'F': [{name: 'Eddy', score: 58}]
     *      // }
     */
    var groupBy = _curry2(_checkForMethod('groupBy', reduceBy(function (acc, item) {
        if (acc == null) {
            acc = [];
        }
        acc.push(item);
        return acc;
    }, null)));

    /**
     * Given a function that generates a key, turns a list of objects into an
     * object indexing the objects by the given key. Note that if multiple
     * objects generate the same value for the indexing key only the last value
     * will be included in the generated object.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.19.0
     * @category List
     * @sig (a -> String) -> [{k: v}] -> {k: {k: v}}
     * @param {Function} fn Function :: a -> String
     * @param {Array} array The array of objects to index
     * @return {Object} An object indexing each array element by the given property.
     * @example
     *
     *      var list = [{id: 'xyz', title: 'A'}, {id: 'abc', title: 'B'}];
     *      R.indexBy(R.prop('id'), list);
     *      //=> {abc: {id: 'abc', title: 'B'}, xyz: {id: 'xyz', title: 'A'}}
     */
    var indexBy = reduceBy(function (acc, elem) {
        return elem;
    }, null);

    /**
     * Returns the position of the first occurrence of an item in an array, or -1
     * if the item is not included in the array. `R.equals` is used to determine
     * equality.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig a -> [a] -> Number
     * @param {*} target The item to find.
     * @param {Array} xs The array to search in.
     * @return {Number} the index of the target, or -1 if the target is not found.
     * @see R.lastIndexOf
     * @example
     *
     *      R.indexOf(3, [1,2,3,4]); //=> 2
     *      R.indexOf(10, [1,2,3,4]); //=> -1
     */
    var indexOf = _curry2(function indexOf(target, xs) {
        return typeof xs.indexOf === 'function' && !_isArray(xs) ? xs.indexOf(target) : _indexOf(xs, target, 0);
    });

    /**
     * juxt applies a list of functions to a list of values.
     *
     * @func
     * @memberOf R
     * @since v0.19.0
     * @category Function
     * @sig [(a, b, ..., m) -> n] -> ((a, b, ..., m) -> [n])
     * @param {Array} fns An array of functions
     * @return {Function} A function that returns a list of values after applying each of the original `fns` to its parameters.
     * @see R.applySpec
     * @example
     *
     *      var getRange = R.juxt([Math.min, Math.max]);
     *      getRange(3, 4, 9, -3); //=> [-3, 9]
     */
    var juxt = _curry1(function juxt(fns) {
        return converge(_arrayOf, fns);
    });

    /**
     * Returns a lens for the given getter and setter functions. The getter "gets"
     * the value of the focus; the setter "sets" the value of the focus. The setter
     * should not mutate the data structure.
     *
     * @func
     * @memberOf R
     * @since v0.8.0
     * @category Object
     * @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
     * @sig (s -> a) -> ((a, s) -> s) -> Lens s a
     * @param {Function} getter
     * @param {Function} setter
     * @return {Lens}
     * @see R.view, R.set, R.over, R.lensIndex, R.lensProp
     * @example
     *
     *      var xLens = R.lens(R.prop('x'), R.assoc('x'));
     *
     *      R.view(xLens, {x: 1, y: 2});            //=> 1
     *      R.set(xLens, 4, {x: 1, y: 2});          //=> {x: 4, y: 2}
     *      R.over(xLens, R.negate, {x: 1, y: 2});  //=> {x: -1, y: 2}
     */
    var lens = _curry2(function lens(getter, setter) {
        return function (toFunctorFn) {
            return function (target) {
                return map(function (focus) {
                    return setter(focus, target);
                }, toFunctorFn(getter(target)));
            };
        };
    });

    /**
     * Returns a lens whose focus is the specified index.
     *
     * @func
     * @memberOf R
     * @since v0.14.0
     * @category Object
     * @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
     * @sig Number -> Lens s a
     * @param {Number} n
     * @return {Lens}
     * @see R.view, R.set, R.over
     * @example
     *
     *      var headLens = R.lensIndex(0);
     *
     *      R.view(headLens, ['a', 'b', 'c']);            //=> 'a'
     *      R.set(headLens, 'x', ['a', 'b', 'c']);        //=> ['x', 'b', 'c']
     *      R.over(headLens, R.toUpper, ['a', 'b', 'c']); //=> ['A', 'b', 'c']
     */
    var lensIndex = _curry1(function lensIndex(n) {
        return lens(nth(n), update(n));
    });

    /**
     * Returns a lens whose focus is the specified path.
     *
     * @func
     * @memberOf R
     * @since v0.19.0
     * @category Object
     * @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
     * @sig [String] -> Lens s a
     * @param {Array} path The path to use.
     * @return {Lens}
     * @see R.view, R.set, R.over
     * @example
     *
     *      var xyLens = R.lensPath(['x', 'y']);
     *
     *      R.view(xyLens, {x: {y: 2, z: 3}});            //=> 2
     *      R.set(xyLens, 4, {x: {y: 2, z: 3}});          //=> {x: {y: 4, z: 3}}
     *      R.over(xyLens, R.negate, {x: {y: 2, z: 3}});  //=> {x: {y: -2, z: 3}}
     */
    var lensPath = _curry1(function lensPath(p) {
        return lens(path(p), assocPath(p));
    });

    /**
     * Returns a lens whose focus is the specified property.
     *
     * @func
     * @memberOf R
     * @since v0.14.0
     * @category Object
     * @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s
     * @sig String -> Lens s a
     * @param {String} k
     * @return {Lens}
     * @see R.view, R.set, R.over
     * @example
     *
     *      var xLens = R.lensProp('x');
     *
     *      R.view(xLens, {x: 1, y: 2});            //=> 1
     *      R.set(xLens, 4, {x: 1, y: 2});          //=> {x: 4, y: 2}
     *      R.over(xLens, R.negate, {x: 1, y: 2});  //=> {x: -1, y: 2}
     */
    var lensProp = _curry1(function lensProp(k) {
        return lens(prop(k), assoc(k));
    });

    /**
     * "lifts" a function to be the specified arity, so that it may "map over" that
     * many lists, Functions or other objects that satisfy the [FantasyLand Apply spec](https://github.com/fantasyland/fantasy-land#apply).
     *
     * @func
     * @memberOf R
     * @since v0.7.0
     * @category Function
     * @sig Number -> (*... -> *) -> ([*]... -> [*])
     * @param {Function} fn The function to lift into higher context
     * @return {Function} The lifted function.
     * @see R.lift, R.ap
     * @example
     *
     *      var madd3 = R.liftN(3, R.curryN(3, (...args) => R.sum(args)));
     *      madd3([1,2,3], [1,2,3], [1]); //=> [3, 4, 5, 4, 5, 6, 5, 6, 7]
     */
    var liftN = _curry2(function liftN(arity, fn) {
        var lifted = curryN(arity, fn);
        return curryN(arity, function () {
            return _reduce(ap, map(lifted, arguments[0]), _slice(arguments, 1));
        });
    });

    /**
     * Returns the mean of the given list of numbers.
     *
     * @func
     * @memberOf R
     * @since v0.14.0
     * @category Math
     * @sig [Number] -> Number
     * @param {Array} list
     * @return {Number}
     * @example
     *
     *      R.mean([2, 7, 9]); //=> 6
     *      R.mean([]); //=> NaN
     */
    var mean = _curry1(function mean(list) {
        return sum(list) / list.length;
    });

    /**
     * Returns the median of the given list of numbers.
     *
     * @func
     * @memberOf R
     * @since v0.14.0
     * @category Math
     * @sig [Number] -> Number
     * @param {Array} list
     * @return {Number}
     * @example
     *
     *      R.median([2, 9, 7]); //=> 7
     *      R.median([7, 2, 10, 9]); //=> 8
     *      R.median([]); //=> NaN
     */
    var median = _curry1(function median(list) {
        var len = list.length;
        if (len === 0) {
            return NaN;
        }
        var width = 2 - len % 2;
        var idx = (len - width) / 2;
        return mean(_slice(list).sort(function (a, b) {
            return a < b ? -1 : a > b ? 1 : 0;
        }).slice(idx, idx + width));
    });

    /**
     * Takes a predicate and a list or other "filterable" object and returns the
     * pair of filterable objects of the same type of elements which do and do not
     * satisfy, the predicate, respectively.
     *
     * @func
     * @memberOf R
     * @since v0.1.4
     * @category List
     * @sig Filterable f => (a -> Boolean) -> f a -> [f a, f a]
     * @param {Function} pred A predicate to determine which side the element belongs to.
     * @param {Array} filterable the list (or other filterable) to partition.
     * @return {Array} An array, containing first the subset of elements that satisfy the
     *         predicate, and second the subset of elements that do not satisfy.
     * @see R.filter, R.reject
     * @example
     *
     *      R.partition(R.contains('s'), ['sss', 'ttt', 'foo', 'bars']);
     *      // => [ [ 'sss', 'bars' ],  [ 'ttt', 'foo' ] ]
     *
     *      R.partition(R.contains('s'), { a: 'sss', b: 'ttt', foo: 'bars' });
     *      // => [ { a: 'sss', foo: 'bars' }, { b: 'ttt' }  ]
     */
    var partition = juxt([
        filter,
        reject
    ]);

    /**
     * Performs left-to-right function composition. The leftmost function may have
     * any arity; the remaining functions must be unary.
     *
     * In some libraries this function is named `sequence`.
     *
     * **Note:** The result of pipe is not automatically curried.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Function
     * @sig (((a, b, ..., n) -> o), (o -> p), ..., (x -> y), (y -> z)) -> ((a, b, ..., n) -> z)
     * @param {...Function} functions
     * @return {Function}
     * @see R.compose
     * @example
     *
     *      var f = R.pipe(Math.pow, R.negate, R.inc);
     *
     *      f(3, 4); // -(3^4) + 1
     */
    var pipe = function pipe() {
        if (arguments.length === 0) {
            throw new Error('pipe requires at least one argument');
        }
        return _arity(arguments[0].length, reduce(_pipe, arguments[0], tail(arguments)));
    };

    /**
     * Performs left-to-right composition of one or more Promise-returning
     * functions. The leftmost function may have any arity; the remaining functions
     * must be unary.
     *
     * @func
     * @memberOf R
     * @since v0.10.0
     * @category Function
     * @sig ((a -> Promise b), (b -> Promise c), ..., (y -> Promise z)) -> (a -> Promise z)
     * @param {...Function} functions
     * @return {Function}
     * @see R.composeP
     * @example
     *
     *      //  followersForUser :: String -> Promise [User]
     *      var followersForUser = R.pipeP(db.getUserById, db.getFollowers);
     */
    var pipeP = function pipeP() {
        if (arguments.length === 0) {
            throw new Error('pipeP requires at least one argument');
        }
        return _arity(arguments[0].length, reduce(_pipeP, arguments[0], tail(arguments)));
    };

    /**
     * Multiplies together all the elements of a list.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Math
     * @sig [Number] -> Number
     * @param {Array} list An array of numbers
     * @return {Number} The product of all the numbers in the list.
     * @see R.reduce
     * @example
     *
     *      R.product([2,4,6,8,100,1]); //=> 38400
     */
    var product = reduce(multiply, 1);

    /**
     * Transforms a [Traversable](https://github.com/fantasyland/fantasy-land#traversable)
     * of [Applicative](https://github.com/fantasyland/fantasy-land#applicative) into an
     * Applicative of Traversable.
     *
     * Dispatches to the `sequence` method of the second argument, if present.
     *
     * @func
     * @memberOf R
     * @since v0.19.0
     * @category List
     * @sig (Applicative f, Traversable t) => (a -> f a) -> t (f a) -> f (t a)
     * @param {Function} of
     * @param {*} traversable
     * @return {*}
     * @see R.traverse
     * @example
     *
     *      R.sequence(Maybe.of, [Just(1), Just(2), Just(3)]);   //=> Just([1, 2, 3])
     *      R.sequence(Maybe.of, [Just(1), Just(2), Nothing()]); //=> Nothing()
     *
     *      R.sequence(R.of, Just([1, 2, 3])); //=> [Just(1), Just(2), Just(3)]
     *      R.sequence(R.of, Nothing());       //=> [Nothing()]
     */
    var sequence = _curry2(function sequence(of, traversable) {
        return typeof traversable.sequence === 'function' ? traversable.sequence(of) : reduceRight(function (acc, x) {
            return ap(map(prepend, x), acc);
        }, of([]), traversable);
    });

    /**
     * Maps an [Applicative](https://github.com/fantasyland/fantasy-land#applicative)-returning
     * function over a [Traversable](https://github.com/fantasyland/fantasy-land#traversable),
     * then uses [`sequence`](#sequence) to transform the resulting Traversable of Applicative
     * into an Applicative of Traversable.
     *
     * Dispatches to the `sequence` method of the third argument, if present.
     *
     * @func
     * @memberOf R
     * @since v0.19.0
     * @category List
     * @sig (Applicative f, Traversable t) => (a -> f a) -> (a -> f b) -> t a -> f (t b)
     * @param {Function} of
     * @param {Function} f
     * @param {*} traversable
     * @return {*}
     * @see R.sequence
     * @example
     *
     *      // Returns `Nothing` if the given divisor is `0`
     *      safeDiv = n => d => d === 0 ? Nothing() : Just(n / d)
     *
     *      R.traverse(Maybe.of, safeDiv(10), [2, 4, 5]); //=> Just([5, 2.5, 2])
     *      R.traverse(Maybe.of, safeDiv(10), [2, 0, 5]); //=> Nothing
     */
    var traverse = _curry3(function traverse(of, f, traversable) {
        return sequence(of, map(f, traversable));
    });

    /**
     * Shorthand for `R.chain(R.identity)`, which removes one level of nesting from
     * any [Chain](https://github.com/fantasyland/fantasy-land#chain).
     *
     * @func
     * @memberOf R
     * @since v0.3.0
     * @category List
     * @sig Chain c => c (c a) -> c a
     * @param {*} list
     * @return {*}
     * @see R.flatten, R.chain
     * @example
     *
     *      R.unnest([1, [2], [[3]]]); //=> [1, 2, [3]]
     *      R.unnest([[1, 2], [3, 4], [5, 6]]); //=> [1, 2, 3, 4, 5, 6]
     */
    var unnest = chain(_identity);

    var _contains = function _contains(a, list) {
        return _indexOf(list, a, 0) >= 0;
    };

    //  mapPairs :: (Object, [String]) -> [String]
    var _toString = function _toString(x, seen) {
        var recur = function recur(y) {
            var xs = seen.concat([x]);
            return _contains(y, xs) ? '<Circular>' : _toString(y, xs);
        };
        //  mapPairs :: (Object, [String]) -> [String]
        var mapPairs = function (obj, keys) {
            return _map(function (k) {
                return _quote(k) + ': ' + recur(obj[k]);
            }, keys.slice().sort());
        };
        switch (Object.prototype.toString.call(x)) {
        case '[object Arguments]':
            return '(function() { return arguments; }(' + _map(recur, x).join(', ') + '))';
        case '[object Array]':
            return '[' + _map(recur, x).concat(mapPairs(x, reject(function (k) {
                return /^\d+$/.test(k);
            }, keys(x)))).join(', ') + ']';
        case '[object Boolean]':
            return typeof x === 'object' ? 'new Boolean(' + recur(x.valueOf()) + ')' : x.toString();
        case '[object Date]':
            return 'new Date(' + (isNaN(x.valueOf()) ? recur(NaN) : _quote(_toISOString(x))) + ')';
        case '[object Null]':
            return 'null';
        case '[object Number]':
            return typeof x === 'object' ? 'new Number(' + recur(x.valueOf()) + ')' : 1 / x === -Infinity ? '-0' : x.toString(10);
        case '[object String]':
            return typeof x === 'object' ? 'new String(' + recur(x.valueOf()) + ')' : _quote(x);
        case '[object Undefined]':
            return 'undefined';
        default:
            if (typeof x.toString === 'function') {
                var repr = x.toString();
                if (repr !== '[object Object]') {
                    return repr;
                }
            }
            return '{' + mapPairs(x, keys(x)).join(', ') + '}';
        }
    };

    /**
     * Performs right-to-left function composition. The rightmost function may have
     * any arity; the remaining functions must be unary.
     *
     * **Note:** The result of compose is not automatically curried.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Function
     * @sig ((y -> z), (x -> y), ..., (o -> p), ((a, b, ..., n) -> o)) -> ((a, b, ..., n) -> z)
     * @param {...Function} functions
     * @return {Function}
     * @see R.pipe
     * @example
     *
     *      var f = R.compose(R.inc, R.negate, Math.pow);
     *
     *      f(3, 4); // -(3^4) + 1
     */
    var compose = function compose() {
        if (arguments.length === 0) {
            throw new Error('compose requires at least one argument');
        }
        return pipe.apply(this, reverse(arguments));
    };

    /**
     * Returns the right-to-left Kleisli composition of the provided functions,
     * each of which must return a value of a type supported by [`chain`](#chain).
     *
     * `R.composeK(h, g, f)` is equivalent to `R.compose(R.chain(h), R.chain(g), R.chain(f))`.
     *
     * @func
     * @memberOf R
     * @since v0.16.0
     * @category Function
     * @sig Chain m => ((y -> m z), (x -> m y), ..., (a -> m b)) -> (m a -> m z)
     * @param {...Function}
     * @return {Function}
     * @see R.pipeK
     * @example
     *
     *      //  parseJson :: String -> Maybe *
     *      //  get :: String -> Object -> Maybe *
     *
     *      //  getStateCode :: Maybe String -> Maybe String
     *      var getStateCode = R.composeK(
     *        R.compose(Maybe.of, R.toUpper),
     *        get('state'),
     *        get('address'),
     *        get('user'),
     *        parseJson
     *      );
     *
     *      getStateCode(Maybe.of('{"user":{"address":{"state":"ny"}}}'));
     *      //=> Just('NY')
     *      getStateCode(Maybe.of('[Invalid JSON]'));
     *      //=> Nothing()
     */
    var composeK = function composeK() {
        return compose.apply(this, prepend(identity, map(chain, arguments)));
    };

    /**
     * Performs right-to-left composition of one or more Promise-returning
     * functions. The rightmost function may have any arity; the remaining
     * functions must be unary.
     *
     * @func
     * @memberOf R
     * @since v0.10.0
     * @category Function
     * @sig ((y -> Promise z), (x -> Promise y), ..., (a -> Promise b)) -> (a -> Promise z)
     * @param {...Function} functions
     * @return {Function}
     * @see R.pipeP
     * @example
     *
     *      //  followersForUser :: String -> Promise [User]
     *      var followersForUser = R.composeP(db.getFollowers, db.getUserById);
     */
    var composeP = function composeP() {
        if (arguments.length === 0) {
            throw new Error('composeP requires at least one argument');
        }
        return pipeP.apply(this, reverse(arguments));
    };

    /**
     * Wraps a constructor function inside a curried function that can be called
     * with the same arguments and returns the same type.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Function
     * @sig (* -> {*}) -> (* -> {*})
     * @param {Function} Fn The constructor function to wrap.
     * @return {Function} A wrapped, curried constructor function.
     * @example
     *
     *      // Constructor function
     *      var Widget = config => {
     *        // ...
     *      };
     *      Widget.prototype = {
     *        // ...
     *      };
     *      var allConfigs = [
     *        // ...
     *      ];
     *      R.map(R.construct(Widget), allConfigs); // a list of Widgets
     */
    var construct = _curry1(function construct(Fn) {
        return constructN(Fn.length, Fn);
    });

    /**
     * Returns `true` if the specified value is equal, in `R.equals` terms, to at
     * least one element of the given list; `false` otherwise.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig a -> [a] -> Boolean
     * @param {Object} a The item to compare against.
     * @param {Array} list The array to consider.
     * @return {Boolean} `true` if the item is in the list, `false` otherwise.
     * @see R.any
     * @example
     *
     *      R.contains(3, [1, 2, 3]); //=> true
     *      R.contains(4, [1, 2, 3]); //=> false
     *      R.contains([42], [[42]]); //=> true
     */
    var contains = _curry2(_contains);

    /**
     * Finds the set (i.e. no duplicates) of all elements in the first list not
     * contained in the second list.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Relation
     * @sig [*] -> [*] -> [*]
     * @param {Array} list1 The first list.
     * @param {Array} list2 The second list.
     * @return {Array} The elements in `list1` that are not in `list2`.
     * @see R.differenceWith, R.symmetricDifference, R.symmetricDifferenceWith
     * @example
     *
     *      R.difference([1,2,3,4], [7,6,5,4,3]); //=> [1,2]
     *      R.difference([7,6,5,4,3], [1,2,3,4]); //=> [7,6,5]
     */
    var difference = _curry2(function difference(first, second) {
        var out = [];
        var idx = 0;
        var firstLen = first.length;
        while (idx < firstLen) {
            if (!_contains(first[idx], second) && !_contains(first[idx], out)) {
                out[out.length] = first[idx];
            }
            idx += 1;
        }
        return out;
    });

    /**
     * Returns a new list without any consecutively repeating elements. `R.equals`
     * is used to determine equality.
     *
     * Dispatches to the `dropRepeats` method of the first argument, if present.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.14.0
     * @category List
     * @sig [a] -> [a]
     * @param {Array} list The array to consider.
     * @return {Array} `list` without repeating elements.
     * @see R.transduce
     * @example
     *
     *     R.dropRepeats([1, 1, 1, 2, 3, 4, 4, 2, 2]); //=> [1, 2, 3, 4, 2]
     */
    var dropRepeats = _curry1(_dispatchable('dropRepeats', _xdropRepeatsWith(equals), dropRepeatsWith(equals)));

    /**
     * "lifts" a function of arity > 1 so that it may "map over" a list, Function or other
     * object that satisfies the [FantasyLand Apply spec](https://github.com/fantasyland/fantasy-land#apply).
     *
     * @func
     * @memberOf R
     * @since v0.7.0
     * @category Function
     * @sig (*... -> *) -> ([*]... -> [*])
     * @param {Function} fn The function to lift into higher context
     * @return {Function} The lifted function.
     * @see R.liftN
     * @example
     *
     *      var madd3 = R.lift(R.curry((a, b, c) => a + b + c));
     *
     *      madd3([1,2,3], [1,2,3], [1]); //=> [3, 4, 5, 4, 5, 6, 5, 6, 7]
     *
     *      var madd5 = R.lift(R.curry((a, b, c, d, e) => a + b + c + d + e));
     *
     *      madd5([1,2], [3], [4, 5], [6], [7, 8]); //=> [21, 22, 22, 23, 22, 23, 23, 24]
     */
    var lift = _curry1(function lift(fn) {
        return liftN(fn.length, fn);
    });

    /**
     * Returns a partial copy of an object omitting the keys specified.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Object
     * @sig [String] -> {String: *} -> {String: *}
     * @param {Array} names an array of String property names to omit from the new object
     * @param {Object} obj The object to copy from
     * @return {Object} A new object with properties from `names` not on it.
     * @see R.pick
     * @example
     *
     *      R.omit(['a', 'd'], {a: 1, b: 2, c: 3, d: 4}); //=> {b: 2, c: 3}
     */
    var omit = _curry2(function omit(names, obj) {
        var result = {};
        for (var prop in obj) {
            if (!_contains(prop, names)) {
                result[prop] = obj[prop];
            }
        }
        return result;
    });

    /**
     * Returns the left-to-right Kleisli composition of the provided functions,
     * each of which must return a value of a type supported by [`chain`](#chain).
     *
     * `R.pipeK(f, g, h)` is equivalent to `R.pipe(R.chain(f), R.chain(g), R.chain(h))`.
     *
     * @func
     * @memberOf R
     * @since v0.16.0
     * @category Function
     * @sig Chain m => ((a -> m b), (b -> m c), ..., (y -> m z)) -> (m a -> m z)
     * @param {...Function}
     * @return {Function}
     * @see R.composeK
     * @example
     *
     *      //  parseJson :: String -> Maybe *
     *      //  get :: String -> Object -> Maybe *
     *
     *      //  getStateCode :: Maybe String -> Maybe String
     *      var getStateCode = R.pipeK(
     *        parseJson,
     *        get('user'),
     *        get('address'),
     *        get('state'),
     *        R.compose(Maybe.of, R.toUpper)
     *      );
     *
     *      getStateCode(Maybe.of('{"user":{"address":{"state":"ny"}}}'));
     *      //=> Just('NY')
     *      getStateCode(Maybe.of('[Invalid JSON]'));
     *      //=> Nothing()
     */
    var pipeK = function pipeK() {
        return composeK.apply(this, reverse(arguments));
    };

    /**
     * Returns the string representation of the given value. `eval`'ing the output
     * should result in a value equivalent to the input value. Many of the built-in
     * `toString` methods do not satisfy this requirement.
     *
     * If the given value is an `[object Object]` with a `toString` method other
     * than `Object.prototype.toString`, this method is invoked with no arguments
     * to produce the return value. This means user-defined constructor functions
     * can provide a suitable `toString` method. For example:
     *
     *     function Point(x, y) {
     *       this.x = x;
     *       this.y = y;
     *     }
     *
     *     Point.prototype.toString = function() {
     *       return 'new Point(' + this.x + ', ' + this.y + ')';
     *     };
     *
     *     R.toString(new Point(1, 2)); //=> 'new Point(1, 2)'
     *
     * @func
     * @memberOf R
     * @since v0.14.0
     * @category String
     * @sig * -> String
     * @param {*} val
     * @return {String}
     * @example
     *
     *      R.toString(42); //=> '42'
     *      R.toString('abc'); //=> '"abc"'
     *      R.toString([1, 2, 3]); //=> '[1, 2, 3]'
     *      R.toString({foo: 1, bar: 2, baz: 3}); //=> '{"bar": 2, "baz": 3, "foo": 1}'
     *      R.toString(new Date('2001-02-03T04:05:06Z')); //=> 'new Date("2001-02-03T04:05:06.000Z")'
     */
    var toString = _curry1(function toString(val) {
        return _toString(val, []);
    });

    /**
     * Returns a new list without values in the first argument.
     * `R.equals` is used to determine equality.
     *
     * Acts as a transducer if a transformer is given in list position.
     *
     * @func
     * @memberOf R
     * @since v0.19.0
     * @category List
     * @sig [a] -> [a] -> [a]
     * @param {Array} list1 The values to be removed from `list2`.
     * @param {Array} list2 The array to remove values from.
     * @return {Array} The new array without values in `list1`.
     * @see R.transduce
     * @example
     *
     *      R.without([1, 2], [1, 2, 1, 3, 4]); //=> [3, 4]
     */
    var without = _curry2(function (xs, list) {
        return reject(flip(_contains)(xs), list);
    });

    // A simple Set type that honours R.equals semantics
    /* globals Set */
    // until we figure out why jsdoc chokes on this
    // @param item The item to add to the Set
    // @returns {boolean} true if the item did not exist prior, otherwise false
    //
    //
    // @param item The item to check for existence in the Set
    // @returns {boolean} true if the item exists in the Set, otherwise false
    //
    //
    // Combines the logic for checking whether an item is a member of the set and
    // for adding a new item to the set.
    //
    // @param item       The item to check or add to the Set instance.
    // @param shouldAdd  If true, the item will be added to the set if it doesn't
    //                   already exist.
    // @param set        The set instance to check or add to.
    // @return {boolean} true if the item already existed, otherwise false.
    //
    // distinguish between +0 and -0
    // these types can all utilise the native Set
    // set._items['boolean'] holds a two element array
    // representing [ falseExists, trueExists ]
    // compare functions for reference equality
    /* falls through */
    // reduce the search size of heterogeneous sets by creating buckets
    // for each type.
    // scan through all previously applied items
    var _Set = function () {
        function _Set() {
            /* globals Set */
            this._nativeSet = typeof Set === 'function' ? new Set() : null;
            this._items = {};
        }
        // until we figure out why jsdoc chokes on this
        // @param item The item to add to the Set
        // @returns {boolean} true if the item did not exist prior, otherwise false
        //
        _Set.prototype.add = function (item) {
            return !hasOrAdd(item, true, this);
        };
        //
        // @param item The item to check for existence in the Set
        // @returns {boolean} true if the item exists in the Set, otherwise false
        //
        _Set.prototype.has = function (item) {
            return hasOrAdd(item, false, this);
        };
        //
        // Combines the logic for checking whether an item is a member of the set and
        // for adding a new item to the set.
        //
        // @param item       The item to check or add to the Set instance.
        // @param shouldAdd  If true, the item will be added to the set if it doesn't
        //                   already exist.
        // @param set        The set instance to check or add to.
        // @return {boolean} true if the item already existed, otherwise false.
        //
        function hasOrAdd(item, shouldAdd, set) {
            var type = typeof item;
            var prevSize, newSize;
            switch (type) {
            case 'string':
            case 'number':
                // distinguish between +0 and -0
                if (item === 0 && 1 / item === -Infinity) {
                    if (set._items['-0']) {
                        return true;
                    } else {
                        if (shouldAdd) {
                            set._items['-0'] = true;
                        }
                        return false;
                    }
                }
                // these types can all utilise the native Set
                if (set._nativeSet !== null) {
                    if (shouldAdd) {
                        prevSize = set._nativeSet.size;
                        set._nativeSet.add(item);
                        newSize = set._nativeSet.size;
                        return newSize === prevSize;
                    } else {
                        return set._nativeSet.has(item);
                    }
                } else {
                    if (!(type in set._items)) {
                        if (shouldAdd) {
                            set._items[type] = {};
                            set._items[type][item] = true;
                        }
                        return false;
                    } else if (item in set._items[type]) {
                        return true;
                    } else {
                        if (shouldAdd) {
                            set._items[type][item] = true;
                        }
                        return false;
                    }
                }
            case 'boolean':
                // set._items['boolean'] holds a two element array
                // representing [ falseExists, trueExists ]
                if (type in set._items) {
                    var bIdx = item ? 1 : 0;
                    if (set._items[type][bIdx]) {
                        return true;
                    } else {
                        if (shouldAdd) {
                            set._items[type][bIdx] = true;
                        }
                        return false;
                    }
                } else {
                    if (shouldAdd) {
                        set._items[type] = item ? [
                            false,
                            true
                        ] : [
                            true,
                            false
                        ];
                    }
                    return false;
                }
            case 'function':
                // compare functions for reference equality
                if (set._nativeSet !== null) {
                    if (shouldAdd) {
                        prevSize = set._nativeSet.size;
                        set._nativeSet.add(item);
                        newSize = set._nativeSet.size;
                        return newSize > prevSize;
                    } else {
                        return set._nativeSet.has(item);
                    }
                } else {
                    if (!(type in set._items)) {
                        if (shouldAdd) {
                            set._items[type] = [item];
                        }
                        return false;
                    }
                    if (!_contains(item, set._items[type])) {
                        if (shouldAdd) {
                            set._items[type].push(item);
                        }
                        return false;
                    }
                    return true;
                }
            case 'undefined':
                if (set._items[type]) {
                    return true;
                } else {
                    if (shouldAdd) {
                        set._items[type] = true;
                    }
                    return false;
                }
            case 'object':
                if (item === null) {
                    if (!set._items['null']) {
                        if (shouldAdd) {
                            set._items['null'] = true;
                        }
                        return false;
                    }
                    return true;
                }
            /* falls through */
            default:
                // reduce the search size of heterogeneous sets by creating buckets
                // for each type.
                type = Object.prototype.toString.call(item);
                if (!(type in set._items)) {
                    if (shouldAdd) {
                        set._items[type] = [item];
                    }
                    return false;
                }
                // scan through all previously applied items
                if (!_contains(item, set._items[type])) {
                    if (shouldAdd) {
                        set._items[type].push(item);
                    }
                    return false;
                }
                return true;
            }
        }
        return _Set;
    }();

    /**
     * A function wrapping calls to the two functions in an `&&` operation,
     * returning the result of the first function if it is false-y and the result
     * of the second function otherwise. Note that this is short-circuited,
     * meaning that the second function will not be invoked if the first returns a
     * false-y value.
     *
     * In addition to functions, `R.both` also accepts any fantasy-land compatible
     * applicative functor.
     *
     * @func
     * @memberOf R
     * @since v0.12.0
     * @category Logic
     * @sig (*... -> Boolean) -> (*... -> Boolean) -> (*... -> Boolean)
     * @param {Function} f a predicate
     * @param {Function} g another predicate
     * @return {Function} a function that applies its arguments to `f` and `g` and `&&`s their outputs together.
     * @see R.and
     * @example
     *
     *      var gt10 = x => x > 10;
     *      var even = x => x % 2 === 0;
     *      var f = R.both(gt10, even);
     *      f(100); //=> true
     *      f(101); //=> false
     */
    var both = _curry2(function both(f, g) {
        return _isFunction(f) ? function _both() {
            return f.apply(this, arguments) && g.apply(this, arguments);
        } : lift(and)(f, g);
    });

    /**
     * Takes a function `f` and returns a function `g` such that:
     *
     *   - applying `g` to zero or more arguments will give __true__ if applying
     *     the same arguments to `f` gives a logical __false__ value; and
     *
     *   - applying `g` to zero or more arguments will give __false__ if applying
     *     the same arguments to `f` gives a logical __true__ value.
     *
     * `R.complement` will work on all other functors as well.
     *
     * @func
     * @memberOf R
     * @since v0.12.0
     * @category Logic
     * @sig (*... -> *) -> (*... -> Boolean)
     * @param {Function} f
     * @return {Function}
     * @see R.not
     * @example
     *
     *      var isEven = n => n % 2 === 0;
     *      var isOdd = R.complement(isEven);
     *      isOdd(21); //=> true
     *      isOdd(42); //=> false
     */
    var complement = lift(not);

    /**
     * Returns the result of concatenating the given lists or strings.
     *
     * Note: `R.concat` expects both arguments to be of the same type,
     * unlike the native `Array.prototype.concat` method. It will throw
     * an error if you `concat` an Array with a non-Array value.
     *
     * Dispatches to the `concat` method of the first argument, if present.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig [a] -> [a] -> [a]
     * @sig String -> String -> String
     * @param {Array|String} a
     * @param {Array|String} b
     * @return {Array|String}
     *
     * @example
     *
     *      R.concat([], []); //=> []
     *      R.concat([4, 5, 6], [1, 2, 3]); //=> [4, 5, 6, 1, 2, 3]
     *      R.concat('ABC', 'DEF'); // 'ABCDEF'
     */
    var concat = _curry2(function concat(a, b) {
        if (a == null || !_isFunction(a.concat)) {
            throw new TypeError(toString(a) + ' does not have a method named "concat"');
        }
        if (_isArray(a) && !_isArray(b)) {
            throw new TypeError(toString(b) + ' is not an array');
        }
        return a.concat(b);
    });

    /**
     * A function wrapping calls to the two functions in an `||` operation,
     * returning the result of the first function if it is truth-y and the result
     * of the second function otherwise. Note that this is short-circuited,
     * meaning that the second function will not be invoked if the first returns a
     * truth-y value.
     *
     * In addition to functions, `R.either` also accepts any fantasy-land compatible
     * applicative functor.
     *
     * @func
     * @memberOf R
     * @since v0.12.0
     * @category Logic
     * @sig (*... -> Boolean) -> (*... -> Boolean) -> (*... -> Boolean)
     * @param {Function} f a predicate
     * @param {Function} g another predicate
     * @return {Function} a function that applies its arguments to `f` and `g` and `||`s their outputs together.
     * @see R.or
     * @example
     *
     *      var gt10 = x => x > 10;
     *      var even = x => x % 2 === 0;
     *      var f = R.either(gt10, even);
     *      f(101); //=> true
     *      f(8); //=> true
     */
    var either = _curry2(function either(f, g) {
        return _isFunction(f) ? function _either() {
            return f.apply(this, arguments) || g.apply(this, arguments);
        } : lift(or)(f, g);
    });

    /**
     * Turns a named method with a specified arity into a function that can be
     * called directly supplied with arguments and a target object.
     *
     * The returned function is curried and accepts `arity + 1` parameters where
     * the final parameter is the target object.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Function
     * @sig Number -> String -> (a -> b -> ... -> n -> Object -> *)
     * @param {Number} arity Number of arguments the returned function should take
     *        before the target object.
     * @param {String} method Name of the method to call.
     * @return {Function} A new curried function.
     * @example
     *
     *      var sliceFrom = R.invoker(1, 'slice');
     *      sliceFrom(6, 'abcdefghijklm'); //=> 'ghijklm'
     *      var sliceFrom6 = R.invoker(2, 'slice')(6);
     *      sliceFrom6(8, 'abcdefghijklm'); //=> 'gh'
     */
    var invoker = _curry2(function invoker(arity, method) {
        return curryN(arity + 1, function () {
            var target = arguments[arity];
            if (target != null && _isFunction(target[method])) {
                return target[method].apply(target, _slice(arguments, 0, arity));
            }
            throw new TypeError(toString(target) + ' does not have a method named "' + method + '"');
        });
    });

    /**
     * Returns a string made by inserting the `separator` between each element and
     * concatenating all the elements into a single string.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig String -> [a] -> String
     * @param {Number|String} separator The string used to separate the elements.
     * @param {Array} xs The elements to join into a string.
     * @return {String} str The string made by concatenating `xs` with `separator`.
     * @see R.split
     * @example
     *
     *      var spacer = R.join(' ');
     *      spacer(['a', 2, 3.4]);   //=> 'a 2 3.4'
     *      R.join('|', [1, 2, 3]);    //=> '1|2|3'
     */
    var join = invoker(1, 'join');

    /**
     * Creates a new function that, when invoked, caches the result of calling `fn`
     * for a given argument set and returns the result. Subsequent calls to the
     * memoized `fn` with the same argument set will not result in an additional
     * call to `fn`; instead, the cached result for that set of arguments will be
     * returned.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Function
     * @sig (*... -> a) -> (*... -> a)
     * @param {Function} fn The function to memoize.
     * @return {Function} Memoized version of `fn`.
     * @example
     *
     *      var count = 0;
     *      var factorial = R.memoize(n => {
     *        count += 1;
     *        return R.product(R.range(1, n + 1));
     *      });
     *      factorial(5); //=> 120
     *      factorial(5); //=> 120
     *      factorial(5); //=> 120
     *      count; //=> 1
     */
    var memoize = _curry1(function memoize(fn) {
        var cache = {};
        return _arity(fn.length, function () {
            var key = toString(arguments);
            if (!_has(key, cache)) {
                cache[key] = fn.apply(this, arguments);
            }
            return cache[key];
        });
    });

    /**
     * Splits a string into an array of strings based on the given
     * separator.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category String
     * @sig (String | RegExp) -> String -> [String]
     * @param {String|RegExp} sep The pattern.
     * @param {String} str The string to separate into an array.
     * @return {Array} The array of strings from `str` separated by `str`.
     * @see R.join
     * @example
     *
     *      var pathComponents = R.split('/');
     *      R.tail(pathComponents('/usr/local/bin/node')); //=> ['usr', 'local', 'bin', 'node']
     *
     *      R.split('.', 'a.b.c.xyz.d'); //=> ['a', 'b', 'c', 'xyz', 'd']
     */
    var split = invoker(1, 'split');

    /**
     * Finds the set (i.e. no duplicates) of all elements contained in the first or
     * second list, but not both.
     *
     * @func
     * @memberOf R
     * @since v0.19.0
     * @category Relation
     * @sig [*] -> [*] -> [*]
     * @param {Array} list1 The first list.
     * @param {Array} list2 The second list.
     * @return {Array} The elements in `list1` or `list2`, but not both.
     * @see R.symmetricDifferenceWith, R.difference, R.differenceWith
     * @example
     *
     *      R.symmetricDifference([1,2,3,4], [7,6,5,4,3]); //=> [1,2,7,6,5]
     *      R.symmetricDifference([7,6,5,4,3], [1,2,3,4]); //=> [7,6,5,1,2]
     */
    var symmetricDifference = _curry2(function symmetricDifference(list1, list2) {
        return concat(difference(list1, list2), difference(list2, list1));
    });

    /**
     * Finds the set (i.e. no duplicates) of all elements contained in the first or
     * second list, but not both. Duplication is determined according to the value
     * returned by applying the supplied predicate to two list elements.
     *
     * @func
     * @memberOf R
     * @since v0.19.0
     * @category Relation
     * @sig (a -> a -> Boolean) -> [a] -> [a] -> [a]
     * @param {Function} pred A predicate used to test whether two items are equal.
     * @param {Array} list1 The first list.
     * @param {Array} list2 The second list.
     * @return {Array} The elements in `list1` or `list2`, but not both.
     * @see R.symmetricDifference, R.difference, R.differenceWith
     * @example
     *
     *      var eqA = R.eqBy(R.prop('a'));
     *      var l1 = [{a: 1}, {a: 2}, {a: 3}, {a: 4}];
     *      var l2 = [{a: 3}, {a: 4}, {a: 5}, {a: 6}];
     *      R.symmetricDifferenceWith(eqA, l1, l2); //=> [{a: 1}, {a: 2}, {a: 5}, {a: 6}]
     */
    var symmetricDifferenceWith = _curry3(function symmetricDifferenceWith(pred, list1, list2) {
        return concat(differenceWith(pred, list1, list2), differenceWith(pred, list2, list1));
    });

    /**
     * Determines whether a given string matches a given regular expression.
     *
     * @func
     * @memberOf R
     * @since v0.12.0
     * @category String
     * @sig RegExp -> String -> Boolean
     * @param {RegExp} pattern
     * @param {String} str
     * @return {Boolean}
     * @see R.match
     * @example
     *
     *      R.test(/^x/, 'xyz'); //=> true
     *      R.test(/^y/, 'xyz'); //=> false
     */
    var test = _curry2(function test(pattern, str) {
        if (!_isRegExp(pattern)) {
            throw new TypeError('\u2018test\u2019 requires a value of type RegExp as its first argument; received ' + toString(pattern));
        }
        return _cloneRegExp(pattern).test(str);
    });

    /**
     * The lower case version of a string.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category String
     * @sig String -> String
     * @param {String} str The string to lower case.
     * @return {String} The lower case version of `str`.
     * @see R.toUpper
     * @example
     *
     *      R.toLower('XYZ'); //=> 'xyz'
     */
    var toLower = invoker(0, 'toLowerCase');

    /**
     * The upper case version of a string.
     *
     * @func
     * @memberOf R
     * @since v0.9.0
     * @category String
     * @sig String -> String
     * @param {String} str The string to upper case.
     * @return {String} The upper case version of `str`.
     * @see R.toLower
     * @example
     *
     *      R.toUpper('abc'); //=> 'ABC'
     */
    var toUpper = invoker(0, 'toUpperCase');

    /**
     * Returns a new list containing only one copy of each element in the original
     * list, based upon the value returned by applying the supplied function to
     * each list element. Prefers the first item if the supplied function produces
     * the same value on two items. `R.equals` is used for comparison.
     *
     * @func
     * @memberOf R
     * @since v0.16.0
     * @category List
     * @sig (a -> b) -> [a] -> [a]
     * @param {Function} fn A function used to produce a value to use during comparisons.
     * @param {Array} list The array to consider.
     * @return {Array} The list of unique items.
     * @example
     *
     *      R.uniqBy(Math.abs, [-1, -5, 2, 10, 1, 2]); //=> [-1, -5, 2, 10]
     */
    var uniqBy = _curry2(function uniqBy(fn, list) {
        var set = new _Set();
        var result = [];
        var idx = 0;
        var appliedItem, item;
        while (idx < list.length) {
            item = list[idx];
            appliedItem = fn(item);
            if (set.add(appliedItem)) {
                result.push(item);
            }
            idx += 1;
        }
        return result;
    });

    /**
     * Returns a new list containing only one copy of each element in the original
     * list. `R.equals` is used to determine equality.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category List
     * @sig [a] -> [a]
     * @param {Array} list The array to consider.
     * @return {Array} The list of unique items.
     * @example
     *
     *      R.uniq([1, 1, 2, 1]); //=> [1, 2]
     *      R.uniq([1, '1']);     //=> [1, '1']
     *      R.uniq([[42], [42]]); //=> [[42]]
     */
    var uniq = uniqBy(identity);

    /**
     * Combines two lists into a set (i.e. no duplicates) composed of those
     * elements common to both lists.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Relation
     * @sig [*] -> [*] -> [*]
     * @param {Array} list1 The first list.
     * @param {Array} list2 The second list.
     * @return {Array} The list of elements found in both `list1` and `list2`.
     * @see R.intersectionWith
     * @example
     *
     *      R.intersection([1,2,3,4], [7,6,5,4,3]); //=> [4, 3]
     */
    var intersection = _curry2(function intersection(list1, list2) {
        var lookupList, filteredList;
        if (list1.length > list2.length) {
            lookupList = list1;
            filteredList = list2;
        } else {
            lookupList = list2;
            filteredList = list1;
        }
        return uniq(_filter(flip(_contains)(lookupList), filteredList));
    });

    /**
     * Combines two lists into a set (i.e. no duplicates) composed of the elements
     * of each list.
     *
     * @func
     * @memberOf R
     * @since v0.1.0
     * @category Relation
     * @sig [*] -> [*] -> [*]
     * @param {Array} as The first list.
     * @param {Array} bs The second list.
     * @return {Array} The first and second lists concatenated, with
     *         duplicates removed.
     * @example
     *
     *      R.union([1, 2, 3], [2, 3, 4]); //=> [1, 2, 3, 4]
     */
    var union = _curry2(compose(uniq, _concat));

    var R = {
        F: F,
        T: T,
        __: __,
        add: add,
        addIndex: addIndex,
        adjust: adjust,
        all: all,
        allPass: allPass,
        always: always,
        and: and,
        any: any,
        anyPass: anyPass,
        ap: ap,
        aperture: aperture,
        append: append,
        apply: apply,
        applySpec: applySpec,
        assoc: assoc,
        assocPath: assocPath,
        binary: binary,
        bind: bind,
        both: both,
        call: call,
        chain: chain,
        clamp: clamp,
        clone: clone,
        comparator: comparator,
        complement: complement,
        compose: compose,
        composeK: composeK,
        composeP: composeP,
        concat: concat,
        cond: cond,
        construct: construct,
        constructN: constructN,
        contains: contains,
        converge: converge,
        countBy: countBy,
        curry: curry,
        curryN: curryN,
        dec: dec,
        defaultTo: defaultTo,
        difference: difference,
        differenceWith: differenceWith,
        dissoc: dissoc,
        dissocPath: dissocPath,
        divide: divide,
        drop: drop,
        dropLast: dropLast,
        dropLastWhile: dropLastWhile,
        dropRepeats: dropRepeats,
        dropRepeatsWith: dropRepeatsWith,
        dropWhile: dropWhile,
        either: either,
        empty: empty,
        eqBy: eqBy,
        eqProps: eqProps,
        equals: equals,
        evolve: evolve,
        filter: filter,
        find: find,
        findIndex: findIndex,
        findLast: findLast,
        findLastIndex: findLastIndex,
        flatten: flatten,
        flip: flip,
        forEach: forEach,
        fromPairs: fromPairs,
        groupBy: groupBy,
        groupWith: groupWith,
        gt: gt,
        gte: gte,
        has: has,
        hasIn: hasIn,
        head: head,
        identical: identical,
        identity: identity,
        ifElse: ifElse,
        inc: inc,
        indexBy: indexBy,
        indexOf: indexOf,
        init: init,
        insert: insert,
        insertAll: insertAll,
        intersection: intersection,
        intersectionWith: intersectionWith,
        intersperse: intersperse,
        into: into,
        invert: invert,
        invertObj: invertObj,
        invoker: invoker,
        is: is,
        isArrayLike: isArrayLike,
        isEmpty: isEmpty,
        isNil: isNil,
        join: join,
        juxt: juxt,
        keys: keys,
        keysIn: keysIn,
        last: last,
        lastIndexOf: lastIndexOf,
        length: length,
        lens: lens,
        lensIndex: lensIndex,
        lensPath: lensPath,
        lensProp: lensProp,
        lift: lift,
        liftN: liftN,
        lt: lt,
        lte: lte,
        map: map,
        mapAccum: mapAccum,
        mapAccumRight: mapAccumRight,
        mapObjIndexed: mapObjIndexed,
        match: match,
        mathMod: mathMod,
        max: max,
        maxBy: maxBy,
        mean: mean,
        median: median,
        memoize: memoize,
        merge: merge,
        mergeAll: mergeAll,
        mergeWith: mergeWith,
        mergeWithKey: mergeWithKey,
        min: min,
        minBy: minBy,
        modulo: modulo,
        multiply: multiply,
        nAry: nAry,
        negate: negate,
        none: none,
        not: not,
        nth: nth,
        nthArg: nthArg,
        objOf: objOf,
        of: of,
        omit: omit,
        once: once,
        or: or,
        over: over,
        pair: pair,
        partial: partial,
        partialRight: partialRight,
        partition: partition,
        path: path,
        pathEq: pathEq,
        pathOr: pathOr,
        pathSatisfies: pathSatisfies,
        pick: pick,
        pickAll: pickAll,
        pickBy: pickBy,
        pipe: pipe,
        pipeK: pipeK,
        pipeP: pipeP,
        pluck: pluck,
        prepend: prepend,
        product: product,
        project: project,
        prop: prop,
        propEq: propEq,
        propIs: propIs,
        propOr: propOr,
        propSatisfies: propSatisfies,
        props: props,
        range: range,
        reduce: reduce,
        reduceBy: reduceBy,
        reduceRight: reduceRight,
        reduceWhile: reduceWhile,
        reduced: reduced,
        reject: reject,
        remove: remove,
        repeat: repeat,
        replace: replace,
        reverse: reverse,
        scan: scan,
        sequence: sequence,
        set: set,
        slice: slice,
        sort: sort,
        sortBy: sortBy,
        split: split,
        splitAt: splitAt,
        splitEvery: splitEvery,
        splitWhen: splitWhen,
        subtract: subtract,
        sum: sum,
        symmetricDifference: symmetricDifference,
        symmetricDifferenceWith: symmetricDifferenceWith,
        tail: tail,
        take: take,
        takeLast: takeLast,
        takeLastWhile: takeLastWhile,
        takeWhile: takeWhile,
        tap: tap,
        test: test,
        times: times,
        toLower: toLower,
        toPairs: toPairs,
        toPairsIn: toPairsIn,
        toString: toString,
        toUpper: toUpper,
        transduce: transduce,
        transpose: transpose,
        traverse: traverse,
        trim: trim,
        tryCatch: tryCatch,
        type: type,
        unapply: unapply,
        unary: unary,
        uncurryN: uncurryN,
        unfold: unfold,
        union: union,
        unionWith: unionWith,
        uniq: uniq,
        uniqBy: uniqBy,
        uniqWith: uniqWith,
        unless: unless,
        unnest: unnest,
        until: until,
        update: update,
        useWith: useWith,
        values: values,
        valuesIn: valuesIn,
        view: view,
        when: when,
        where: where,
        whereEq: whereEq,
        without: without,
        wrap: wrap,
        xprod: xprod,
        zip: zip,
        zipObj: zipObj,
        zipWith: zipWith
    };
  /* eslint-env amd */

  /* TEST_ENTRY_POINT */

  if (typeof exports === 'object') {
    module.exports = R;
  } else if (typeof define === 'function' && define.amd) {
    define(function() { return R; });
  } else {
    this.R = R;
  }

}.call(this));

},{}]},{},[])
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e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require==\"function\"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error(\"Cannot find module '\"+o+\"'\");throw f.code=\"MODULE_NOT_FOUND\",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require==\"function\"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})","//  Ramda v0.22.1\n//  https://github.com/ramda/ramda\n//  (c) 2013-2016 Scott Sauyet, Michael Hurley, and David Chambers\n//  Ramda may be freely distributed under the MIT license.\n\n;(function() {\n\n  'use strict';\n\n  /**\n     * A special placeholder value used to specify \"gaps\" within curried functions,\n     * allowing partial application of any combination of arguments, regardless of\n     * their positions.\n     *\n     * If `g` is a curried ternary function and `_` is `R.__`, the following are\n     * equivalent:\n     *\n     *   - `g(1, 2, 3)`\n     *   - `g(_, 2, 3)(1)`\n     *   - `g(_, _, 3)(1)(2)`\n     *   - `g(_, _, 3)(1, 2)`\n     *   - `g(_, 2, _)(1, 3)`\n     *   - `g(_, 2)(1)(3)`\n     *   - `g(_, 2)(1, 3)`\n     *   - `g(_, 2)(_, 3)(1)`\n     *\n     * @constant\n     * @memberOf R\n     * @since v0.6.0\n     * @category Function\n     * @example\n     *\n     *      var greet = R.replace('{name}', R.__, 'Hello, {name}!');\n     *      greet('Alice'); //=> 'Hello, Alice!'\n     */\n    var __ = { '@@functional/placeholder': true };\n\n    /* eslint-disable no-unused-vars */\n    var _arity = function _arity(n, fn) {\n        /* eslint-disable no-unused-vars */\n        switch (n) {\n        case 0:\n            return function () {\n                return fn.apply(this, arguments);\n            };\n        case 1:\n            return function (a0) {\n                return fn.apply(this, arguments);\n            };\n        case 2:\n            return function (a0, a1) {\n                return fn.apply(this, arguments);\n            };\n        case 3:\n            return function (a0, a1, a2) {\n                return fn.apply(this, arguments);\n            };\n        case 4:\n            return function (a0, a1, a2, a3) {\n                return fn.apply(this, arguments);\n            };\n        case 5:\n            return function (a0, a1, a2, a3, a4) {\n                return fn.apply(this, arguments);\n            };\n        case 6:\n            return function (a0, a1, a2, a3, a4, a5) {\n                return fn.apply(this, arguments);\n            };\n        case 7:\n            return function (a0, a1, a2, a3, a4, a5, a6) {\n                return fn.apply(this, arguments);\n            };\n        case 8:\n            return function (a0, a1, a2, a3, a4, a5, a6, a7) {\n                return fn.apply(this, arguments);\n            };\n        case 9:\n            return function (a0, a1, a2, a3, a4, a5, a6, a7, a8) {\n                return fn.apply(this, arguments);\n            };\n        case 10:\n            return function (a0, a1, a2, a3, a4, a5, a6, a7, a8, a9) {\n                return fn.apply(this, arguments);\n            };\n        default:\n            throw new Error('First argument to _arity must be a non-negative integer no greater than ten');\n        }\n    };\n\n    var _arrayFromIterator = function _arrayFromIterator(iter) {\n        var list = [];\n        var next;\n        while (!(next = iter.next()).done) {\n            list.push(next.value);\n        }\n        return list;\n    };\n\n    var _arrayOf = function _arrayOf() {\n        return Array.prototype.slice.call(arguments);\n    };\n\n    var _cloneRegExp = function _cloneRegExp(pattern) {\n        return new RegExp(pattern.source, (pattern.global ? 'g' : '') + (pattern.ignoreCase ? 'i' : '') + (pattern.multiline ? 'm' : '') + (pattern.sticky ? 'y' : '') + (pattern.unicode ? 'u' : ''));\n    };\n\n    var _complement = function _complement(f) {\n        return function () {\n            return !f.apply(this, arguments);\n        };\n    };\n\n    /**\n     * Private `concat` function to merge two array-like objects.\n     *\n     * @private\n     * @param {Array|Arguments} [set1=[]] An array-like object.\n     * @param {Array|Arguments} [set2=[]] An array-like object.\n     * @return {Array} A new, merged array.\n     * @example\n     *\n     *      _concat([4, 5, 6], [1, 2, 3]); //=> [4, 5, 6, 1, 2, 3]\n     */\n    var _concat = function _concat(set1, set2) {\n        set1 = set1 || [];\n        set2 = set2 || [];\n        var idx;\n        var len1 = set1.length;\n        var len2 = set2.length;\n        var result = [];\n        idx = 0;\n        while (idx < len1) {\n            result[result.length] = set1[idx];\n            idx += 1;\n        }\n        idx = 0;\n        while (idx < len2) {\n            result[result.length] = set2[idx];\n            idx += 1;\n        }\n        return result;\n    };\n\n    var _containsWith = function _containsWith(pred, x, list) {\n        var idx = 0;\n        var len = list.length;\n        while (idx < len) {\n            if (pred(x, list[idx])) {\n                return true;\n            }\n            idx += 1;\n        }\n        return false;\n    };\n\n    var _filter = function _filter(fn, list) {\n        var idx = 0;\n        var len = list.length;\n        var result = [];\n        while (idx < len) {\n            if (fn(list[idx])) {\n                result[result.length] = list[idx];\n            }\n            idx += 1;\n        }\n        return result;\n    };\n\n    var _forceReduced = function _forceReduced(x) {\n        return {\n            '@@transducer/value': x,\n            '@@transducer/reduced': true\n        };\n    };\n\n    // String(x => x) evaluates to \"x => x\", so the pattern may not match.\n    var _functionName = function _functionName(f) {\n        // String(x => x) evaluates to \"x => x\", so the pattern may not match.\n        var match = String(f).match(/^function (\\w*)/);\n        return match == null ? '' : match[1];\n    };\n\n    var _has = function _has(prop, obj) {\n        return Object.prototype.hasOwnProperty.call(obj, prop);\n    };\n\n    var _identity = function _identity(x) {\n        return x;\n    };\n\n    var _isArguments = function () {\n        var toString = Object.prototype.toString;\n        return toString.call(arguments) === '[object Arguments]' ? function _isArguments(x) {\n            return toString.call(x) === '[object Arguments]';\n        } : function _isArguments(x) {\n            return _has('callee', x);\n        };\n    }();\n\n    /**\n     * Tests whether or not an object is an array.\n     *\n     * @private\n     * @param {*} val The object to test.\n     * @return {Boolean} `true` if `val` is an array, `false` otherwise.\n     * @example\n     *\n     *      _isArray([]); //=> true\n     *      _isArray(null); //=> false\n     *      _isArray({}); //=> false\n     */\n    var _isArray = Array.isArray || function _isArray(val) {\n        return val != null && val.length >= 0 && Object.prototype.toString.call(val) === '[object Array]';\n    };\n\n    var _isFunction = function _isFunction(x) {\n        return Object.prototype.toString.call(x) === '[object Function]';\n    };\n\n    /**\n     * Determine if the passed argument is an integer.\n     *\n     * @private\n     * @param {*} n\n     * @category Type\n     * @return {Boolean}\n     */\n    var _isInteger = Number.isInteger || function _isInteger(n) {\n        return n << 0 === n;\n    };\n\n    var _isNumber = function _isNumber(x) {\n        return Object.prototype.toString.call(x) === '[object Number]';\n    };\n\n    var _isObject = function _isObject(x) {\n        return Object.prototype.toString.call(x) === '[object Object]';\n    };\n\n    var _isPlaceholder = function _isPlaceholder(a) {\n        return a != null && typeof a === 'object' && a['@@functional/placeholder'] === true;\n    };\n\n    var _isRegExp = function _isRegExp(x) {\n        return Object.prototype.toString.call(x) === '[object RegExp]';\n    };\n\n    var _isString = function _isString(x) {\n        return Object.prototype.toString.call(x) === '[object String]';\n    };\n\n    var _isTransformer = function _isTransformer(obj) {\n        return typeof obj['@@transducer/step'] === 'function';\n    };\n\n    var _map = function _map(fn, functor) {\n        var idx = 0;\n        var len = functor.length;\n        var result = Array(len);\n        while (idx < len) {\n            result[idx] = fn(functor[idx]);\n            idx += 1;\n        }\n        return result;\n    };\n\n    // Based on https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Object/assign\n    var _objectAssign = function _objectAssign(target) {\n        if (target == null) {\n            throw new TypeError('Cannot convert undefined or null to object');\n        }\n        var output = Object(target);\n        var idx = 1;\n        var length = arguments.length;\n        while (idx < length) {\n            var source = arguments[idx];\n            if (source != null) {\n                for (var nextKey in source) {\n                    if (_has(nextKey, source)) {\n                        output[nextKey] = source[nextKey];\n                    }\n                }\n            }\n            idx += 1;\n        }\n        return output;\n    };\n\n    var _of = function _of(x) {\n        return [x];\n    };\n\n    var _pipe = function _pipe(f, g) {\n        return function () {\n            return g.call(this, f.apply(this, arguments));\n        };\n    };\n\n    var _pipeP = function _pipeP(f, g) {\n        return function () {\n            var ctx = this;\n            return f.apply(ctx, arguments).then(function (x) {\n                return g.call(ctx, x);\n            });\n        };\n    };\n\n    // \\b matches word boundary; [\\b] matches backspace\n    var _quote = function _quote(s) {\n        var escaped = s.replace(/\\\\/g, '\\\\\\\\').replace(/[\\b]/g, '\\\\b')    // \\b matches word boundary; [\\b] matches backspace\n    .replace(/\\f/g, '\\\\f').replace(/\\n/g, '\\\\n').replace(/\\r/g, '\\\\r').replace(/\\t/g, '\\\\t').replace(/\\v/g, '\\\\v').replace(/\\0/g, '\\\\0');\n        return '\"' + escaped.replace(/\"/g, '\\\\\"') + '\"';\n    };\n\n    var _reduced = function _reduced(x) {\n        return x && x['@@transducer/reduced'] ? x : {\n            '@@transducer/value': x,\n            '@@transducer/reduced': true\n        };\n    };\n\n    /**\n     * An optimized, private array `slice` implementation.\n     *\n     * @private\n     * @param {Arguments|Array} args The array or arguments object to consider.\n     * @param {Number} [from=0] The array index to slice from, inclusive.\n     * @param {Number} [to=args.length] The array index to slice to, exclusive.\n     * @return {Array} A new, sliced array.\n     * @example\n     *\n     *      _slice([1, 2, 3, 4, 5], 1, 3); //=> [2, 3]\n     *\n     *      var firstThreeArgs = function(a, b, c, d) {\n     *        return _slice(arguments, 0, 3);\n     *      };\n     *      firstThreeArgs(1, 2, 3, 4); //=> [1, 2, 3]\n     */\n    var _slice = function _slice(args, from, to) {\n        switch (arguments.length) {\n        case 1:\n            return _slice(args, 0, args.length);\n        case 2:\n            return _slice(args, from, args.length);\n        default:\n            var list = [];\n            var idx = 0;\n            var len = Math.max(0, Math.min(args.length, to) - from);\n            while (idx < len) {\n                list[idx] = args[from + idx];\n                idx += 1;\n            }\n            return list;\n        }\n    };\n\n    /**\n     * Polyfill from <https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString>.\n     */\n    var _toISOString = function () {\n        var pad = function pad(n) {\n            return (n < 10 ? '0' : '') + n;\n        };\n        return typeof Date.prototype.toISOString === 'function' ? function _toISOString(d) {\n            return d.toISOString();\n        } : function _toISOString(d) {\n            return d.getUTCFullYear() + '-' + pad(d.getUTCMonth() + 1) + '-' + pad(d.getUTCDate()) + 'T' + pad(d.getUTCHours()) + ':' + pad(d.getUTCMinutes()) + ':' + pad(d.getUTCSeconds()) + '.' + (d.getUTCMilliseconds() / 1000).toFixed(3).slice(2, 5) + 'Z';\n        };\n    }();\n\n    var _xfBase = {\n        init: function () {\n            return this.xf['@@transducer/init']();\n        },\n        result: function (result) {\n            return this.xf['@@transducer/result'](result);\n        }\n    };\n\n    var _xwrap = function () {\n        function XWrap(fn) {\n            this.f = fn;\n        }\n        XWrap.prototype['@@transducer/init'] = function () {\n            throw new Error('init not implemented on XWrap');\n        };\n        XWrap.prototype['@@transducer/result'] = function (acc) {\n            return acc;\n        };\n        XWrap.prototype['@@transducer/step'] = function (acc, x) {\n            return this.f(acc, x);\n        };\n        return function _xwrap(fn) {\n            return new XWrap(fn);\n        };\n    }();\n\n    var _aperture = function _aperture(n, list) {\n        var idx = 0;\n        var limit = list.length - (n - 1);\n        var acc = new Array(limit >= 0 ? limit : 0);\n        while (idx < limit) {\n            acc[idx] = _slice(list, idx, idx + n);\n            idx += 1;\n        }\n        return acc;\n    };\n\n    var _assign = typeof Object.assign === 'function' ? Object.assign : _objectAssign;\n\n    /**\n     * Similar to hasMethod, this checks whether a function has a [methodname]\n     * function. If it isn't an array it will execute that function otherwise it\n     * will default to the ramda implementation.\n     *\n     * @private\n     * @param {Function} fn ramda implemtation\n     * @param {String} methodname property to check for a custom implementation\n     * @return {Object} Whatever the return value of the method is.\n     */\n    var _checkForMethod = function _checkForMethod(methodname, fn) {\n        return function () {\n            var length = arguments.length;\n            if (length === 0) {\n                return fn();\n            }\n            var obj = arguments[length - 1];\n            return _isArray(obj) || typeof obj[methodname] !== 'function' ? fn.apply(this, arguments) : obj[methodname].apply(obj, _slice(arguments, 0, length - 1));\n        };\n    };\n\n    /**\n     * Optimized internal one-arity curry function.\n     *\n     * @private\n     * @category Function\n     * @param {Function} fn The function to curry.\n     * @return {Function} The curried function.\n     */\n    var _curry1 = function _curry1(fn) {\n        return function f1(a) {\n            if (arguments.length === 0 || _isPlaceholder(a)) {\n                return f1;\n            } else {\n                return fn.apply(this, arguments);\n            }\n        };\n    };\n\n    /**\n     * Optimized internal two-arity curry function.\n     *\n     * @private\n     * @category Function\n     * @param {Function} fn The function to curry.\n     * @return {Function} The curried function.\n     */\n    var _curry2 = function _curry2(fn) {\n        return function f2(a, b) {\n            switch (arguments.length) {\n            case 0:\n                return f2;\n            case 1:\n                return _isPlaceholder(a) ? f2 : _curry1(function (_b) {\n                    return fn(a, _b);\n                });\n            default:\n                return _isPlaceholder(a) && _isPlaceholder(b) ? f2 : _isPlaceholder(a) ? _curry1(function (_a) {\n                    return fn(_a, b);\n                }) : _isPlaceholder(b) ? _curry1(function (_b) {\n                    return fn(a, _b);\n                }) : fn(a, b);\n            }\n        };\n    };\n\n    /**\n     * Optimized internal three-arity curry function.\n     *\n     * @private\n     * @category Function\n     * @param {Function} fn The function to curry.\n     * @return {Function} The curried function.\n     */\n    var _curry3 = function _curry3(fn) {\n        return function f3(a, b, c) {\n            switch (arguments.length) {\n            case 0:\n                return f3;\n            case 1:\n                return _isPlaceholder(a) ? f3 : _curry2(function (_b, _c) {\n                    return fn(a, _b, _c);\n                });\n            case 2:\n                return _isPlaceholder(a) && _isPlaceholder(b) ? f3 : _isPlaceholder(a) ? _curry2(function (_a, _c) {\n                    return fn(_a, b, _c);\n                }) : _isPlaceholder(b) ? _curry2(function (_b, _c) {\n                    return fn(a, _b, _c);\n                }) : _curry1(function (_c) {\n                    return fn(a, b, _c);\n                });\n            default:\n                return _isPlaceholder(a) && _isPlaceholder(b) && _isPlaceholder(c) ? f3 : _isPlaceholder(a) && _isPlaceholder(b) ? _curry2(function (_a, _b) {\n                    return fn(_a, _b, c);\n                }) : _isPlaceholder(a) && _isPlaceholder(c) ? _curry2(function (_a, _c) {\n                    return fn(_a, b, _c);\n                }) : _isPlaceholder(b) && _isPlaceholder(c) ? _curry2(function (_b, _c) {\n                    return fn(a, _b, _c);\n                }) : _isPlaceholder(a) ? _curry1(function (_a) {\n                    return fn(_a, b, c);\n                }) : _isPlaceholder(b) ? _curry1(function (_b) {\n                    return fn(a, _b, c);\n                }) : _isPlaceholder(c) ? _curry1(function (_c) {\n                    return fn(a, b, _c);\n                }) : fn(a, b, c);\n            }\n        };\n    };\n\n    /**\n     * Internal curryN function.\n     *\n     * @private\n     * @category Function\n     * @param {Number} length The arity of the curried function.\n     * @param {Array} received An array of arguments received thus far.\n     * @param {Function} fn The function to curry.\n     * @return {Function} The curried function.\n     */\n    var _curryN = function _curryN(length, received, fn) {\n        return function () {\n            var combined = [];\n            var argsIdx = 0;\n            var left = length;\n            var combinedIdx = 0;\n            while (combinedIdx < received.length || argsIdx < arguments.length) {\n                var result;\n                if (combinedIdx < received.length && (!_isPlaceholder(received[combinedIdx]) || argsIdx >= arguments.length)) {\n                    result = received[combinedIdx];\n                } else {\n                    result = arguments[argsIdx];\n                    argsIdx += 1;\n                }\n                combined[combinedIdx] = result;\n                if (!_isPlaceholder(result)) {\n                    left -= 1;\n                }\n                combinedIdx += 1;\n            }\n            return left <= 0 ? fn.apply(this, combined) : _arity(left, _curryN(length, combined, fn));\n        };\n    };\n\n    /**\n     * Returns a function that dispatches with different strategies based on the\n     * object in list position (last argument). If it is an array, executes [fn].\n     * Otherwise, if it has a function with [methodname], it will execute that\n     * function (functor case). Otherwise, if it is a transformer, uses transducer\n     * [xf] to return a new transformer (transducer case). Otherwise, it will\n     * default to executing [fn].\n     *\n     * @private\n     * @param {String} methodname property to check for a custom implementation\n     * @param {Function} xf transducer to initialize if object is transformer\n     * @param {Function} fn default ramda implementation\n     * @return {Function} A function that dispatches on object in list position\n     */\n    var _dispatchable = function _dispatchable(methodname, xf, fn) {\n        return function () {\n            var length = arguments.length;\n            if (length === 0) {\n                return fn();\n            }\n            var obj = arguments[length - 1];\n            if (!_isArray(obj)) {\n                var args = _slice(arguments, 0, length - 1);\n                if (typeof obj[methodname] === 'function') {\n                    return obj[methodname].apply(obj, args);\n                }\n                if (_isTransformer(obj)) {\n                    var transducer = xf.apply(null, args);\n                    return transducer(obj);\n                }\n            }\n            return fn.apply(this, arguments);\n        };\n    };\n\n    var _dropLastWhile = function dropLastWhile(pred, list) {\n        var idx = list.length - 1;\n        while (idx >= 0 && pred(list[idx])) {\n            idx -= 1;\n        }\n        return _slice(list, 0, idx + 1);\n    };\n\n    var _xall = function () {\n        function XAll(f, xf) {\n            this.xf = xf;\n            this.f = f;\n            this.all = true;\n        }\n        XAll.prototype['@@transducer/init'] = _xfBase.init;\n        XAll.prototype['@@transducer/result'] = function (result) {\n            if (this.all) {\n                result = this.xf['@@transducer/step'](result, true);\n            }\n            return this.xf['@@transducer/result'](result);\n        };\n        XAll.prototype['@@transducer/step'] = function (result, input) {\n            if (!this.f(input)) {\n                this.all = false;\n                result = _reduced(this.xf['@@transducer/step'](result, false));\n            }\n            return result;\n        };\n        return _curry2(function _xall(f, xf) {\n            return new XAll(f, xf);\n        });\n    }();\n\n    var _xany = function () {\n        function XAny(f, xf) {\n            this.xf = xf;\n            this.f = f;\n            this.any = false;\n        }\n        XAny.prototype['@@transducer/init'] = _xfBase.init;\n        XAny.prototype['@@transducer/result'] = function (result) {\n            if (!this.any) {\n                result = this.xf['@@transducer/step'](result, false);\n            }\n            return this.xf['@@transducer/result'](result);\n        };\n        XAny.prototype['@@transducer/step'] = function (result, input) {\n            if (this.f(input)) {\n                this.any = true;\n                result = _reduced(this.xf['@@transducer/step'](result, true));\n            }\n            return result;\n        };\n        return _curry2(function _xany(f, xf) {\n            return new XAny(f, xf);\n        });\n    }();\n\n    var _xaperture = function () {\n        function XAperture(n, xf) {\n            this.xf = xf;\n            this.pos = 0;\n            this.full = false;\n            this.acc = new Array(n);\n        }\n        XAperture.prototype['@@transducer/init'] = _xfBase.init;\n        XAperture.prototype['@@transducer/result'] = function (result) {\n            this.acc = null;\n            return this.xf['@@transducer/result'](result);\n        };\n        XAperture.prototype['@@transducer/step'] = function (result, input) {\n            this.store(input);\n            return this.full ? this.xf['@@transducer/step'](result, this.getCopy()) : result;\n        };\n        XAperture.prototype.store = function (input) {\n            this.acc[this.pos] = input;\n            this.pos += 1;\n            if (this.pos === this.acc.length) {\n                this.pos = 0;\n                this.full = true;\n            }\n        };\n        XAperture.prototype.getCopy = function () {\n            return _concat(_slice(this.acc, this.pos), _slice(this.acc, 0, this.pos));\n        };\n        return _curry2(function _xaperture(n, xf) {\n            return new XAperture(n, xf);\n        });\n    }();\n\n    var _xdrop = function () {\n        function XDrop(n, xf) {\n            this.xf = xf;\n            this.n = n;\n        }\n        XDrop.prototype['@@transducer/init'] = _xfBase.init;\n        XDrop.prototype['@@transducer/result'] = _xfBase.result;\n        XDrop.prototype['@@transducer/step'] = function (result, input) {\n            if (this.n > 0) {\n                this.n -= 1;\n                return result;\n            }\n            return this.xf['@@transducer/step'](result, input);\n        };\n        return _curry2(function _xdrop(n, xf) {\n            return new XDrop(n, xf);\n        });\n    }();\n\n    var _xdropLast = function () {\n        function XDropLast(n, xf) {\n            this.xf = xf;\n            this.pos = 0;\n            this.full = false;\n            this.acc = new Array(n);\n        }\n        XDropLast.prototype['@@transducer/init'] = _xfBase.init;\n        XDropLast.prototype['@@transducer/result'] = function (result) {\n            this.acc = null;\n            return this.xf['@@transducer/result'](result);\n        };\n        XDropLast.prototype['@@transducer/step'] = function (result, input) {\n            if (this.full) {\n                result = this.xf['@@transducer/step'](result, this.acc[this.pos]);\n            }\n            this.store(input);\n            return result;\n        };\n        XDropLast.prototype.store = function (input) {\n            this.acc[this.pos] = input;\n            this.pos += 1;\n            if (this.pos === this.acc.length) {\n                this.pos = 0;\n                this.full = true;\n            }\n        };\n        return _curry2(function _xdropLast(n, xf) {\n            return new XDropLast(n, xf);\n        });\n    }();\n\n    var _xdropRepeatsWith = function () {\n        function XDropRepeatsWith(pred, xf) {\n            this.xf = xf;\n            this.pred = pred;\n            this.lastValue = undefined;\n            this.seenFirstValue = false;\n        }\n        XDropRepeatsWith.prototype['@@transducer/init'] = function () {\n            return this.xf['@@transducer/init']();\n        };\n        XDropRepeatsWith.prototype['@@transducer/result'] = function (result) {\n            return this.xf['@@transducer/result'](result);\n        };\n        XDropRepeatsWith.prototype['@@transducer/step'] = function (result, input) {\n            var sameAsLast = false;\n            if (!this.seenFirstValue) {\n                this.seenFirstValue = true;\n            } else if (this.pred(this.lastValue, input)) {\n                sameAsLast = true;\n            }\n            this.lastValue = input;\n            return sameAsLast ? result : this.xf['@@transducer/step'](result, input);\n        };\n        return _curry2(function _xdropRepeatsWith(pred, xf) {\n            return new XDropRepeatsWith(pred, xf);\n        });\n    }();\n\n    var _xdropWhile = function () {\n        function XDropWhile(f, xf) {\n            this.xf = xf;\n            this.f = f;\n        }\n        XDropWhile.prototype['@@transducer/init'] = _xfBase.init;\n        XDropWhile.prototype['@@transducer/result'] = _xfBase.result;\n        XDropWhile.prototype['@@transducer/step'] = function (result, input) {\n            if (this.f) {\n                if (this.f(input)) {\n                    return result;\n                }\n                this.f = null;\n            }\n            return this.xf['@@transducer/step'](result, input);\n        };\n        return _curry2(function _xdropWhile(f, xf) {\n            return new XDropWhile(f, xf);\n        });\n    }();\n\n    var _xfilter = function () {\n        function XFilter(f, xf) {\n            this.xf = xf;\n            this.f = f;\n        }\n        XFilter.prototype['@@transducer/init'] = _xfBase.init;\n        XFilter.prototype['@@transducer/result'] = _xfBase.result;\n        XFilter.prototype['@@transducer/step'] = function (result, input) {\n            return this.f(input) ? this.xf['@@transducer/step'](result, input) : result;\n        };\n        return _curry2(function _xfilter(f, xf) {\n            return new XFilter(f, xf);\n        });\n    }();\n\n    var _xfind = function () {\n        function XFind(f, xf) {\n            this.xf = xf;\n            this.f = f;\n            this.found = false;\n        }\n        XFind.prototype['@@transducer/init'] = _xfBase.init;\n        XFind.prototype['@@transducer/result'] = function (result) {\n            if (!this.found) {\n                result = this.xf['@@transducer/step'](result, void 0);\n            }\n            return this.xf['@@transducer/result'](result);\n        };\n        XFind.prototype['@@transducer/step'] = function (result, input) {\n            if (this.f(input)) {\n                this.found = true;\n                result = _reduced(this.xf['@@transducer/step'](result, input));\n            }\n            return result;\n        };\n        return _curry2(function _xfind(f, xf) {\n            return new XFind(f, xf);\n        });\n    }();\n\n    var _xfindIndex = function () {\n        function XFindIndex(f, xf) {\n            this.xf = xf;\n            this.f = f;\n            this.idx = -1;\n            this.found = false;\n        }\n        XFindIndex.prototype['@@transducer/init'] = _xfBase.init;\n        XFindIndex.prototype['@@transducer/result'] = function (result) {\n            if (!this.found) {\n                result = this.xf['@@transducer/step'](result, -1);\n            }\n            return this.xf['@@transducer/result'](result);\n        };\n        XFindIndex.prototype['@@transducer/step'] = function (result, input) {\n            this.idx += 1;\n            if (this.f(input)) {\n                this.found = true;\n                result = _reduced(this.xf['@@transducer/step'](result, this.idx));\n            }\n            return result;\n        };\n        return _curry2(function _xfindIndex(f, xf) {\n            return new XFindIndex(f, xf);\n        });\n    }();\n\n    var _xfindLast = function () {\n        function XFindLast(f, xf) {\n            this.xf = xf;\n            this.f = f;\n        }\n        XFindLast.prototype['@@transducer/init'] = _xfBase.init;\n        XFindLast.prototype['@@transducer/result'] = function (result) {\n            return this.xf['@@transducer/result'](this.xf['@@transducer/step'](result, this.last));\n        };\n        XFindLast.prototype['@@transducer/step'] = function (result, input) {\n            if (this.f(input)) {\n                this.last = input;\n            }\n            return result;\n        };\n        return _curry2(function _xfindLast(f, xf) {\n            return new XFindLast(f, xf);\n        });\n    }();\n\n    var _xfindLastIndex = function () {\n        function XFindLastIndex(f, xf) {\n            this.xf = xf;\n            this.f = f;\n            this.idx = -1;\n            this.lastIdx = -1;\n        }\n        XFindLastIndex.prototype['@@transducer/init'] = _xfBase.init;\n        XFindLastIndex.prototype['@@transducer/result'] = function (result) {\n            return this.xf['@@transducer/result'](this.xf['@@transducer/step'](result, this.lastIdx));\n        };\n        XFindLastIndex.prototype['@@transducer/step'] = function (result, input) {\n            this.idx += 1;\n            if (this.f(input)) {\n                this.lastIdx = this.idx;\n            }\n            return result;\n        };\n        return _curry2(function _xfindLastIndex(f, xf) {\n            return new XFindLastIndex(f, xf);\n        });\n    }();\n\n    var _xmap = function () {\n        function XMap(f, xf) {\n            this.xf = xf;\n            this.f = f;\n        }\n        XMap.prototype['@@transducer/init'] = _xfBase.init;\n        XMap.prototype['@@transducer/result'] = _xfBase.result;\n        XMap.prototype['@@transducer/step'] = function (result, input) {\n            return this.xf['@@transducer/step'](result, this.f(input));\n        };\n        return _curry2(function _xmap(f, xf) {\n            return new XMap(f, xf);\n        });\n    }();\n\n    var _xreduceBy = function () {\n        function XReduceBy(valueFn, valueAcc, keyFn, xf) {\n            this.valueFn = valueFn;\n            this.valueAcc = valueAcc;\n            this.keyFn = keyFn;\n            this.xf = xf;\n            this.inputs = {};\n        }\n        XReduceBy.prototype['@@transducer/init'] = _xfBase.init;\n        XReduceBy.prototype['@@transducer/result'] = function (result) {\n            var key;\n            for (key in this.inputs) {\n                if (_has(key, this.inputs)) {\n                    result = this.xf['@@transducer/step'](result, this.inputs[key]);\n                    if (result['@@transducer/reduced']) {\n                        result = result['@@transducer/value'];\n                        break;\n                    }\n                }\n            }\n            this.inputs = null;\n            return this.xf['@@transducer/result'](result);\n        };\n        XReduceBy.prototype['@@transducer/step'] = function (result, input) {\n            var key = this.keyFn(input);\n            this.inputs[key] = this.inputs[key] || [\n                key,\n                this.valueAcc\n            ];\n            this.inputs[key][1] = this.valueFn(this.inputs[key][1], input);\n            return result;\n        };\n        return _curryN(4, [], function _xreduceBy(valueFn, valueAcc, keyFn, xf) {\n            return new XReduceBy(valueFn, valueAcc, keyFn, xf);\n        });\n    }();\n\n    var _xtake = function () {\n        function XTake(n, xf) {\n            this.xf = xf;\n            this.n = n;\n            this.i = 0;\n        }\n        XTake.prototype['@@transducer/init'] = _xfBase.init;\n        XTake.prototype['@@transducer/result'] = _xfBase.result;\n        XTake.prototype['@@transducer/step'] = function (result, input) {\n            this.i += 1;\n            var ret = this.n === 0 ? result : this.xf['@@transducer/step'](result, input);\n            return this.i >= this.n ? _reduced(ret) : ret;\n        };\n        return _curry2(function _xtake(n, xf) {\n            return new XTake(n, xf);\n        });\n    }();\n\n    var _xtakeWhile = function () {\n        function XTakeWhile(f, xf) {\n            this.xf = xf;\n            this.f = f;\n        }\n        XTakeWhile.prototype['@@transducer/init'] = _xfBase.init;\n        XTakeWhile.prototype['@@transducer/result'] = _xfBase.result;\n        XTakeWhile.prototype['@@transducer/step'] = function (result, input) {\n            return this.f(input) ? this.xf['@@transducer/step'](result, input) : _reduced(result);\n        };\n        return _curry2(function _xtakeWhile(f, xf) {\n            return new XTakeWhile(f, xf);\n        });\n    }();\n\n    /**\n     * Adds two values.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Math\n     * @sig Number -> Number -> Number\n     * @param {Number} a\n     * @param {Number} b\n     * @return {Number}\n     * @see R.subtract\n     * @example\n     *\n     *      R.add(2, 3);       //=>  5\n     *      R.add(7)(10);      //=> 17\n     */\n    var add = _curry2(function add(a, b) {\n        return Number(a) + Number(b);\n    });\n\n    /**\n     * Applies a function to the value at the given index of an array, returning a\n     * new copy of the array with the element at the given index replaced with the\n     * result of the function application.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.14.0\n     * @category List\n     * @sig (a -> a) -> Number -> [a] -> [a]\n     * @param {Function} fn The function to apply.\n     * @param {Number} idx The index.\n     * @param {Array|Arguments} list An array-like object whose value\n     *        at the supplied index will be replaced.\n     * @return {Array} A copy of the supplied array-like object with\n     *         the element at index `idx` replaced with the value\n     *         returned by applying `fn` to the existing element.\n     * @see R.update\n     * @example\n     *\n     *      R.adjust(R.add(10), 1, [0, 1, 2]);     //=> [0, 11, 2]\n     *      R.adjust(R.add(10))(1)([0, 1, 2]);     //=> [0, 11, 2]\n     */\n    var adjust = _curry3(function adjust(fn, idx, list) {\n        if (idx >= list.length || idx < -list.length) {\n            return list;\n        }\n        var start = idx < 0 ? list.length : 0;\n        var _idx = start + idx;\n        var _list = _concat(list);\n        _list[_idx] = fn(list[_idx]);\n        return _list;\n    });\n\n    /**\n     * Returns `true` if all elements of the list match the predicate, `false` if\n     * there are any that don't.\n     *\n     * Dispatches to the `all` method of the second argument, if present.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig (a -> Boolean) -> [a] -> Boolean\n     * @param {Function} fn The predicate function.\n     * @param {Array} list The array to consider.\n     * @return {Boolean} `true` if the predicate is satisfied by every element, `false`\n     *         otherwise.\n     * @see R.any, R.none, R.transduce\n     * @example\n     *\n     *      var lessThan2 = R.flip(R.lt)(2);\n     *      var lessThan3 = R.flip(R.lt)(3);\n     *      R.all(lessThan2)([1, 2]); //=> false\n     *      R.all(lessThan3)([1, 2]); //=> true\n     */\n    var all = _curry2(_dispatchable('all', _xall, function all(fn, list) {\n        var idx = 0;\n        while (idx < list.length) {\n            if (!fn(list[idx])) {\n                return false;\n            }\n            idx += 1;\n        }\n        return true;\n    }));\n\n    /**\n     * Returns a function that always returns the given value. Note that for\n     * non-primitives the value returned is a reference to the original value.\n     *\n     * This function is known as `const`, `constant`, or `K` (for K combinator) in\n     * other languages and libraries.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Function\n     * @sig a -> (* -> a)\n     * @param {*} val The value to wrap in a function\n     * @return {Function} A Function :: * -> val.\n     * @example\n     *\n     *      var t = R.always('Tee');\n     *      t(); //=> 'Tee'\n     */\n    var always = _curry1(function always(val) {\n        return function () {\n            return val;\n        };\n    });\n\n    /**\n     * Returns `true` if both arguments are `true`; `false` otherwise.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Logic\n     * @sig * -> * -> *\n     * @param {Boolean} a A boolean value\n     * @param {Boolean} b A boolean value\n     * @return {Boolean} `true` if both arguments are `true`, `false` otherwise\n     * @see R.both\n     * @example\n     *\n     *      R.and(true, true); //=> true\n     *      R.and(true, false); //=> false\n     *      R.and(false, true); //=> false\n     *      R.and(false, false); //=> false\n     */\n    var and = _curry2(function and(a, b) {\n        return a && b;\n    });\n\n    /**\n     * Returns `true` if at least one of elements of the list match the predicate,\n     * `false` otherwise.\n     *\n     * Dispatches to the `any` method of the second argument, if present.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig (a -> Boolean) -> [a] -> Boolean\n     * @param {Function} fn The predicate function.\n     * @param {Array} list The array to consider.\n     * @return {Boolean} `true` if the predicate is satisfied by at least one element, `false`\n     *         otherwise.\n     * @see R.all, R.none, R.transduce\n     * @example\n     *\n     *      var lessThan0 = R.flip(R.lt)(0);\n     *      var lessThan2 = R.flip(R.lt)(2);\n     *      R.any(lessThan0)([1, 2]); //=> false\n     *      R.any(lessThan2)([1, 2]); //=> true\n     */\n    var any = _curry2(_dispatchable('any', _xany, function any(fn, list) {\n        var idx = 0;\n        while (idx < list.length) {\n            if (fn(list[idx])) {\n                return true;\n            }\n            idx += 1;\n        }\n        return false;\n    }));\n\n    /**\n     * Returns a new list, composed of n-tuples of consecutive elements If `n` is\n     * greater than the length of the list, an empty list is returned.\n     *\n     * Dispatches to the `aperture` method of the second argument, if present.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.12.0\n     * @category List\n     * @sig Number -> [a] -> [[a]]\n     * @param {Number} n The size of the tuples to create\n     * @param {Array} list The list to split into `n`-tuples\n     * @return {Array} The new list.\n     * @see R.transduce\n     * @example\n     *\n     *      R.aperture(2, [1, 2, 3, 4, 5]); //=> [[1, 2], [2, 3], [3, 4], [4, 5]]\n     *      R.aperture(3, [1, 2, 3, 4, 5]); //=> [[1, 2, 3], [2, 3, 4], [3, 4, 5]]\n     *      R.aperture(7, [1, 2, 3, 4, 5]); //=> []\n     */\n    var aperture = _curry2(_dispatchable('aperture', _xaperture, _aperture));\n\n    /**\n     * Returns a new list containing the contents of the given list, followed by\n     * the given element.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig a -> [a] -> [a]\n     * @param {*} el The element to add to the end of the new list.\n     * @param {Array} list The list whose contents will be added to the beginning of the output\n     *        list.\n     * @return {Array} A new list containing the contents of the old list followed by `el`.\n     * @see R.prepend\n     * @example\n     *\n     *      R.append('tests', ['write', 'more']); //=> ['write', 'more', 'tests']\n     *      R.append('tests', []); //=> ['tests']\n     *      R.append(['tests'], ['write', 'more']); //=> ['write', 'more', ['tests']]\n     */\n    var append = _curry2(function append(el, list) {\n        return _concat(list, [el]);\n    });\n\n    /**\n     * Applies function `fn` to the argument list `args`. This is useful for\n     * creating a fixed-arity function from a variadic function. `fn` should be a\n     * bound function if context is significant.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.7.0\n     * @category Function\n     * @sig (*... -> a) -> [*] -> a\n     * @param {Function} fn\n     * @param {Array} args\n     * @return {*}\n     * @see R.call, R.unapply\n     * @example\n     *\n     *      var nums = [1, 2, 3, -99, 42, 6, 7];\n     *      R.apply(Math.max, nums); //=> 42\n     */\n    var apply = _curry2(function apply(fn, args) {\n        return fn.apply(this, args);\n    });\n\n    /**\n     * Makes a shallow clone of an object, setting or overriding the specified\n     * property with the given value. Note that this copies and flattens prototype\n     * properties onto the new object as well. All non-primitive properties are\n     * copied by reference.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.8.0\n     * @category Object\n     * @sig String -> a -> {k: v} -> {k: v}\n     * @param {String} prop the property name to set\n     * @param {*} val the new value\n     * @param {Object} obj the object to clone\n     * @return {Object} a new object similar to the original except for the specified property.\n     * @see R.dissoc\n     * @example\n     *\n     *      R.assoc('c', 3, {a: 1, b: 2}); //=> {a: 1, b: 2, c: 3}\n     */\n    var assoc = _curry3(function assoc(prop, val, obj) {\n        var result = {};\n        for (var p in obj) {\n            result[p] = obj[p];\n        }\n        result[prop] = val;\n        return result;\n    });\n\n    /**\n     * Makes a shallow clone of an object, setting or overriding the nodes required\n     * to create the given path, and placing the specific value at the tail end of\n     * that path. Note that this copies and flattens prototype properties onto the\n     * new object as well. All non-primitive properties are copied by reference.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.8.0\n     * @category Object\n     * @sig [String] -> a -> {k: v} -> {k: v}\n     * @param {Array} path the path to set\n     * @param {*} val the new value\n     * @param {Object} obj the object to clone\n     * @return {Object} a new object similar to the original except along the specified path.\n     * @see R.dissocPath\n     * @example\n     *\n     *      R.assocPath(['a', 'b', 'c'], 42, {a: {b: {c: 0}}}); //=> {a: {b: {c: 42}}}\n     */\n    var assocPath = _curry3(function assocPath(path, val, obj) {\n        switch (path.length) {\n        case 0:\n            return val;\n        case 1:\n            return assoc(path[0], val, obj);\n        default:\n            return assoc(path[0], assocPath(_slice(path, 1), val, Object(obj[path[0]])), obj);\n        }\n    });\n\n    /**\n     * Creates a function that is bound to a context.\n     * Note: `R.bind` does not provide the additional argument-binding capabilities of\n     * [Function.prototype.bind](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Function/bind).\n     *\n     * @func\n     * @memberOf R\n     * @since v0.6.0\n     * @category Function\n     * @category Object\n     * @sig (* -> *) -> {*} -> (* -> *)\n     * @param {Function} fn The function to bind to context\n     * @param {Object} thisObj The context to bind `fn` to\n     * @return {Function} A function that will execute in the context of `thisObj`.\n     * @see R.partial\n     * @example\n     *\n     *      var log = R.bind(console.log, console);\n     *      R.pipe(R.assoc('a', 2), R.tap(log), R.assoc('a', 3))({a: 1}); //=> {a: 3}\n     *      // logs {a: 2}\n     */\n    var bind = _curry2(function bind(fn, thisObj) {\n        return _arity(fn.length, function () {\n            return fn.apply(thisObj, arguments);\n        });\n    });\n\n    /**\n     * Restricts a number to be within a range.\n     *\n     * Also works for other ordered types such as Strings and Dates.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.20.0\n     * @category Relation\n     * @sig Ord a => a -> a -> a -> a\n     * @param {Number} minimum number\n     * @param {Number} maximum number\n     * @param {Number} value to be clamped\n     * @return {Number} Returns the clamped value\n     * @example\n     *\n     *      R.clamp(1, 10, -1) // => 1\n     *      R.clamp(1, 10, 11) // => 10\n     *      R.clamp(1, 10, 4)  // => 4\n     */\n    var clamp = _curry3(function clamp(min, max, value) {\n        if (min > max) {\n            throw new Error('min must not be greater than max in clamp(min, max, value)');\n        }\n        return value < min ? min : value > max ? max : value;\n    });\n\n    /**\n     * Makes a comparator function out of a function that reports whether the first\n     * element is less than the second.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Function\n     * @sig (a, b -> Boolean) -> (a, b -> Number)\n     * @param {Function} pred A predicate function of arity two.\n     * @return {Function} A Function :: a -> b -> Int that returns `-1` if a < b, `1` if b < a, otherwise `0`.\n     * @example\n     *\n     *      var cmp = R.comparator((a, b) => a.age < b.age);\n     *      var people = [\n     *        // ...\n     *      ];\n     *      R.sort(cmp, people);\n     */\n    var comparator = _curry1(function comparator(pred) {\n        return function (a, b) {\n            return pred(a, b) ? -1 : pred(b, a) ? 1 : 0;\n        };\n    });\n\n    /**\n     * Returns a curried equivalent of the provided function, with the specified\n     * arity. The curried function has two unusual capabilities. First, its\n     * arguments needn't be provided one at a time. If `g` is `R.curryN(3, f)`, the\n     * following are equivalent:\n     *\n     *   - `g(1)(2)(3)`\n     *   - `g(1)(2, 3)`\n     *   - `g(1, 2)(3)`\n     *   - `g(1, 2, 3)`\n     *\n     * Secondly, the special placeholder value `R.__` may be used to specify\n     * \"gaps\", allowing partial application of any combination of arguments,\n     * regardless of their positions. If `g` is as above and `_` is `R.__`, the\n     * following are equivalent:\n     *\n     *   - `g(1, 2, 3)`\n     *   - `g(_, 2, 3)(1)`\n     *   - `g(_, _, 3)(1)(2)`\n     *   - `g(_, _, 3)(1, 2)`\n     *   - `g(_, 2)(1)(3)`\n     *   - `g(_, 2)(1, 3)`\n     *   - `g(_, 2)(_, 3)(1)`\n     *\n     * @func\n     * @memberOf R\n     * @since v0.5.0\n     * @category Function\n     * @sig Number -> (* -> a) -> (* -> a)\n     * @param {Number} length The arity for the returned function.\n     * @param {Function} fn The function to curry.\n     * @return {Function} A new, curried function.\n     * @see R.curry\n     * @example\n     *\n     *      var sumArgs = (...args) => R.sum(args);\n     *\n     *      var curriedAddFourNumbers = R.curryN(4, sumArgs);\n     *      var f = curriedAddFourNumbers(1, 2);\n     *      var g = f(3);\n     *      g(4); //=> 10\n     */\n    var curryN = _curry2(function curryN(length, fn) {\n        if (length === 1) {\n            return _curry1(fn);\n        }\n        return _arity(length, _curryN(length, [], fn));\n    });\n\n    /**\n     * Decrements its argument.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category Math\n     * @sig Number -> Number\n     * @param {Number} n\n     * @return {Number}\n     * @see R.inc\n     * @example\n     *\n     *      R.dec(42); //=> 41\n     */\n    var dec = add(-1);\n\n    /**\n     * Returns the second argument if it is not `null`, `undefined` or `NaN`\n     * otherwise the first argument is returned.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.10.0\n     * @category Logic\n     * @sig a -> b -> a | b\n     * @param {a} val The default value.\n     * @param {b} val The value to return if it is not null or undefined\n     * @return {*} The the second value or the default value\n     * @example\n     *\n     *      var defaultTo42 = R.defaultTo(42);\n     *\n     *      defaultTo42(null);  //=> 42\n     *      defaultTo42(undefined);  //=> 42\n     *      defaultTo42('Ramda');  //=> 'Ramda'\n     *      defaultTo42(parseInt('string')); //=> 42\n     */\n    var defaultTo = _curry2(function defaultTo(d, v) {\n        return v == null || v !== v ? d : v;\n    });\n\n    /**\n     * Finds the set (i.e. no duplicates) of all elements in the first list not\n     * contained in the second list. Duplication is determined according to the\n     * value returned by applying the supplied predicate to two list elements.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Relation\n     * @sig (a -> a -> Boolean) -> [*] -> [*] -> [*]\n     * @param {Function} pred A predicate used to test whether two items are equal.\n     * @param {Array} list1 The first list.\n     * @param {Array} list2 The second list.\n     * @return {Array} The elements in `list1` that are not in `list2`.\n     * @see R.difference, R.symmetricDifference, R.symmetricDifferenceWith\n     * @example\n     *\n     *      var cmp = (x, y) => x.a === y.a;\n     *      var l1 = [{a: 1}, {a: 2}, {a: 3}];\n     *      var l2 = [{a: 3}, {a: 4}];\n     *      R.differenceWith(cmp, l1, l2); //=> [{a: 1}, {a: 2}]\n     */\n    var differenceWith = _curry3(function differenceWith(pred, first, second) {\n        var out = [];\n        var idx = 0;\n        var firstLen = first.length;\n        while (idx < firstLen) {\n            if (!_containsWith(pred, first[idx], second) && !_containsWith(pred, first[idx], out)) {\n                out.push(first[idx]);\n            }\n            idx += 1;\n        }\n        return out;\n    });\n\n    /**\n     * Returns a new object that does not contain a `prop` property.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.10.0\n     * @category Object\n     * @sig String -> {k: v} -> {k: v}\n     * @param {String} prop the name of the property to dissociate\n     * @param {Object} obj the object to clone\n     * @return {Object} a new object similar to the original but without the specified property\n     * @see R.assoc\n     * @example\n     *\n     *      R.dissoc('b', {a: 1, b: 2, c: 3}); //=> {a: 1, c: 3}\n     */\n    var dissoc = _curry2(function dissoc(prop, obj) {\n        var result = {};\n        for (var p in obj) {\n            if (p !== prop) {\n                result[p] = obj[p];\n            }\n        }\n        return result;\n    });\n\n    /**\n     * Makes a shallow clone of an object, omitting the property at the given path.\n     * Note that this copies and flattens prototype properties onto the new object\n     * as well. All non-primitive properties are copied by reference.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.11.0\n     * @category Object\n     * @sig [String] -> {k: v} -> {k: v}\n     * @param {Array} path the path to set\n     * @param {Object} obj the object to clone\n     * @return {Object} a new object without the property at path\n     * @see R.assocPath\n     * @example\n     *\n     *      R.dissocPath(['a', 'b', 'c'], {a: {b: {c: 42}}}); //=> {a: {b: {}}}\n     */\n    var dissocPath = _curry2(function dissocPath(path, obj) {\n        switch (path.length) {\n        case 0:\n            return obj;\n        case 1:\n            return dissoc(path[0], obj);\n        default:\n            var head = path[0];\n            var tail = _slice(path, 1);\n            return obj[head] == null ? obj : assoc(head, dissocPath(tail, obj[head]), obj);\n        }\n    });\n\n    /**\n     * Divides two numbers. Equivalent to `a / b`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Math\n     * @sig Number -> Number -> Number\n     * @param {Number} a The first value.\n     * @param {Number} b The second value.\n     * @return {Number} The result of `a / b`.\n     * @see R.multiply\n     * @example\n     *\n     *      R.divide(71, 100); //=> 0.71\n     *\n     *      var half = R.divide(R.__, 2);\n     *      half(42); //=> 21\n     *\n     *      var reciprocal = R.divide(1);\n     *      reciprocal(4);   //=> 0.25\n     */\n    var divide = _curry2(function divide(a, b) {\n        return a / b;\n    });\n\n    /**\n     * Returns a new list excluding the leading elements of a given list which\n     * satisfy the supplied predicate function. It passes each value to the supplied\n     * predicate function, skipping elements while the predicate function returns\n     * `true`. The predicate function is applied to one argument: *(value)*.\n     *\n     * Dispatches to the `dropWhile` method of the second argument, if present.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category List\n     * @sig (a -> Boolean) -> [a] -> [a]\n     * @param {Function} fn The function called per iteration.\n     * @param {Array} list The collection to iterate over.\n     * @return {Array} A new array.\n     * @see R.takeWhile, R.transduce, R.addIndex\n     * @example\n     *\n     *      var lteTwo = x => x <= 2;\n     *\n     *      R.dropWhile(lteTwo, [1, 2, 3, 4, 3, 2, 1]); //=> [3, 4, 3, 2, 1]\n     */\n    var dropWhile = _curry2(_dispatchable('dropWhile', _xdropWhile, function dropWhile(pred, list) {\n        var idx = 0;\n        var len = list.length;\n        while (idx < len && pred(list[idx])) {\n            idx += 1;\n        }\n        return _slice(list, idx);\n    }));\n\n    /**\n     * Returns the empty value of its argument's type. Ramda defines the empty\n     * value of Array (`[]`), Object (`{}`), String (`''`), and Arguments. Other\n     * types are supported if they define `<Type>.empty` and/or\n     * `<Type>.prototype.empty`.\n     *\n     * Dispatches to the `empty` method of the first argument, if present.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.3.0\n     * @category Function\n     * @sig a -> a\n     * @param {*} x\n     * @return {*}\n     * @example\n     *\n     *      R.empty(Just(42));      //=> Nothing()\n     *      R.empty([1, 2, 3]);     //=> []\n     *      R.empty('unicorns');    //=> ''\n     *      R.empty({x: 1, y: 2});  //=> {}\n     */\n    // else\n    var empty = _curry1(function empty(x) {\n        return x != null && typeof x.empty === 'function' ? x.empty() : x != null && x.constructor != null && typeof x.constructor.empty === 'function' ? x.constructor.empty() : _isArray(x) ? [] : _isString(x) ? '' : _isObject(x) ? {} : _isArguments(x) ? function () {\n            return arguments;\n        }() : // else\n        void 0;\n    });\n\n    /**\n     * Creates a new object by recursively evolving a shallow copy of `object`,\n     * according to the `transformation` functions. All non-primitive properties\n     * are copied by reference.\n     *\n     * A `transformation` function will not be invoked if its corresponding key\n     * does not exist in the evolved object.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category Object\n     * @sig {k: (v -> v)} -> {k: v} -> {k: v}\n     * @param {Object} transformations The object specifying transformation functions to apply\n     *        to the object.\n     * @param {Object} object The object to be transformed.\n     * @return {Object} The transformed object.\n     * @example\n     *\n     *      var tomato  = {firstName: '  Tomato ', data: {elapsed: 100, remaining: 1400}, id:123};\n     *      var transformations = {\n     *        firstName: R.trim,\n     *        lastName: R.trim, // Will not get invoked.\n     *        data: {elapsed: R.add(1), remaining: R.add(-1)}\n     *      };\n     *      R.evolve(transformations, tomato); //=> {firstName: 'Tomato', data: {elapsed: 101, remaining: 1399}, id:123}\n     */\n    var evolve = _curry2(function evolve(transformations, object) {\n        var result = {};\n        var transformation, key, type;\n        for (key in object) {\n            transformation = transformations[key];\n            type = typeof transformation;\n            result[key] = type === 'function' ? transformation(object[key]) : type === 'object' ? evolve(transformations[key], object[key]) : object[key];\n        }\n        return result;\n    });\n\n    /**\n     * Returns the first element of the list which matches the predicate, or\n     * `undefined` if no element matches.\n     *\n     * Dispatches to the `find` method of the second argument, if present.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig (a -> Boolean) -> [a] -> a | undefined\n     * @param {Function} fn The predicate function used to determine if the element is the\n     *        desired one.\n     * @param {Array} list The array to consider.\n     * @return {Object} The element found, or `undefined`.\n     * @see R.transduce\n     * @example\n     *\n     *      var xs = [{a: 1}, {a: 2}, {a: 3}];\n     *      R.find(R.propEq('a', 2))(xs); //=> {a: 2}\n     *      R.find(R.propEq('a', 4))(xs); //=> undefined\n     */\n    var find = _curry2(_dispatchable('find', _xfind, function find(fn, list) {\n        var idx = 0;\n        var len = list.length;\n        while (idx < len) {\n            if (fn(list[idx])) {\n                return list[idx];\n            }\n            idx += 1;\n        }\n    }));\n\n    /**\n     * Returns the index of the first element of the list which matches the\n     * predicate, or `-1` if no element matches.\n     *\n     * Dispatches to the `findIndex` method of the second argument, if present.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.1\n     * @category List\n     * @sig (a -> Boolean) -> [a] -> Number\n     * @param {Function} fn The predicate function used to determine if the element is the\n     * desired one.\n     * @param {Array} list The array to consider.\n     * @return {Number} The index of the element found, or `-1`.\n     * @see R.transduce\n     * @example\n     *\n     *      var xs = [{a: 1}, {a: 2}, {a: 3}];\n     *      R.findIndex(R.propEq('a', 2))(xs); //=> 1\n     *      R.findIndex(R.propEq('a', 4))(xs); //=> -1\n     */\n    var findIndex = _curry2(_dispatchable('findIndex', _xfindIndex, function findIndex(fn, list) {\n        var idx = 0;\n        var len = list.length;\n        while (idx < len) {\n            if (fn(list[idx])) {\n                return idx;\n            }\n            idx += 1;\n        }\n        return -1;\n    }));\n\n    /**\n     * Returns the last element of the list which matches the predicate, or\n     * `undefined` if no element matches.\n     *\n     * Dispatches to the `findLast` method of the second argument, if present.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.1\n     * @category List\n     * @sig (a -> Boolean) -> [a] -> a | undefined\n     * @param {Function} fn The predicate function used to determine if the element is the\n     * desired one.\n     * @param {Array} list The array to consider.\n     * @return {Object} The element found, or `undefined`.\n     * @see R.transduce\n     * @example\n     *\n     *      var xs = [{a: 1, b: 0}, {a:1, b: 1}];\n     *      R.findLast(R.propEq('a', 1))(xs); //=> {a: 1, b: 1}\n     *      R.findLast(R.propEq('a', 4))(xs); //=> undefined\n     */\n    var findLast = _curry2(_dispatchable('findLast', _xfindLast, function findLast(fn, list) {\n        var idx = list.length - 1;\n        while (idx >= 0) {\n            if (fn(list[idx])) {\n                return list[idx];\n            }\n            idx -= 1;\n        }\n    }));\n\n    /**\n     * Returns the index of the last element of the list which matches the\n     * predicate, or `-1` if no element matches.\n     *\n     * Dispatches to the `findLastIndex` method of the second argument, if present.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.1\n     * @category List\n     * @sig (a -> Boolean) -> [a] -> Number\n     * @param {Function} fn The predicate function used to determine if the element is the\n     * desired one.\n     * @param {Array} list The array to consider.\n     * @return {Number} The index of the element found, or `-1`.\n     * @see R.transduce\n     * @example\n     *\n     *      var xs = [{a: 1, b: 0}, {a:1, b: 1}];\n     *      R.findLastIndex(R.propEq('a', 1))(xs); //=> 1\n     *      R.findLastIndex(R.propEq('a', 4))(xs); //=> -1\n     */\n    var findLastIndex = _curry2(_dispatchable('findLastIndex', _xfindLastIndex, function findLastIndex(fn, list) {\n        var idx = list.length - 1;\n        while (idx >= 0) {\n            if (fn(list[idx])) {\n                return idx;\n            }\n            idx -= 1;\n        }\n        return -1;\n    }));\n\n    /**\n     * Iterate over an input `list`, calling a provided function `fn` for each\n     * element in the list.\n     *\n     * `fn` receives one argument: *(value)*.\n     *\n     * Note: `R.forEach` does not skip deleted or unassigned indices (sparse\n     * arrays), unlike the native `Array.prototype.forEach` method. For more\n     * details on this behavior, see:\n     * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/forEach#Description\n     *\n     * Also note that, unlike `Array.prototype.forEach`, Ramda's `forEach` returns\n     * the original array. In some libraries this function is named `each`.\n     *\n     * Dispatches to the `forEach` method of the second argument, if present.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.1\n     * @category List\n     * @sig (a -> *) -> [a] -> [a]\n     * @param {Function} fn The function to invoke. Receives one argument, `value`.\n     * @param {Array} list The list to iterate over.\n     * @return {Array} The original list.\n     * @see R.addIndex\n     * @example\n     *\n     *      var printXPlusFive = x => console.log(x + 5);\n     *      R.forEach(printXPlusFive, [1, 2, 3]); //=> [1, 2, 3]\n     *      // logs 6\n     *      // logs 7\n     *      // logs 8\n     */\n    var forEach = _curry2(_checkForMethod('forEach', function forEach(fn, list) {\n        var len = list.length;\n        var idx = 0;\n        while (idx < len) {\n            fn(list[idx]);\n            idx += 1;\n        }\n        return list;\n    }));\n\n    /**\n     * Creates a new object from a list key-value pairs. If a key appears in\n     * multiple pairs, the rightmost pair is included in the object.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.3.0\n     * @category List\n     * @sig [[k,v]] -> {k: v}\n     * @param {Array} pairs An array of two-element arrays that will be the keys and values of the output object.\n     * @return {Object} The object made by pairing up `keys` and `values`.\n     * @see R.toPairs, R.pair\n     * @example\n     *\n     *      R.fromPairs([['a', 1], ['b', 2], ['c', 3]]); //=> {a: 1, b: 2, c: 3}\n     */\n    var fromPairs = _curry1(function fromPairs(pairs) {\n        var result = {};\n        var idx = 0;\n        while (idx < pairs.length) {\n            result[pairs[idx][0]] = pairs[idx][1];\n            idx += 1;\n        }\n        return result;\n    });\n\n    /**\n     * Takes a list and returns a list of lists where each sublist's elements are\n     * all \"equal\" according to the provided equality function.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.21.0\n     * @category List\n     * @sig ((a, a) → Boolean) → [a] → [[a]]\n     * @param {Function} fn Function for determining whether two given (adjacent)\n     *        elements should be in the same group\n     * @param {Array} list The array to group. Also accepts a string, which will be\n     *        treated as a list of characters.\n     * @return {List} A list that contains sublists of equal elements,\n     *         whose concatenations are equal to the original list.\n     * @example\n     *\n     * R.groupWith(R.equals, [0, 1, 1, 2, 3, 5, 8, 13, 21])\n     * //=> [[0], [1, 1], [2], [3], [5], [8], [13], [21]]\n     *\n     * R.groupWith((a, b) => a % 2 === b % 2, [0, 1, 1, 2, 3, 5, 8, 13, 21])\n     * //=> [[0], [1, 1], [2], [3, 5], [8], [13, 21]]\n     *\n     * R.groupWith(R.eqBy(isVowel), 'aestiou')\n     * //=> ['ae', 'st', 'iou']\n     */\n    var groupWith = _curry2(function (fn, list) {\n        var res = [];\n        var idx = 0;\n        var len = list.length;\n        while (idx < len) {\n            var nextidx = idx + 1;\n            while (nextidx < len && fn(list[idx], list[nextidx])) {\n                nextidx += 1;\n            }\n            res.push(list.slice(idx, nextidx));\n            idx = nextidx;\n        }\n        return res;\n    });\n\n    /**\n     * Returns `true` if the first argument is greater than the second; `false`\n     * otherwise.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Relation\n     * @sig Ord a => a -> a -> Boolean\n     * @param {*} a\n     * @param {*} b\n     * @return {Boolean}\n     * @see R.lt\n     * @example\n     *\n     *      R.gt(2, 1); //=> true\n     *      R.gt(2, 2); //=> false\n     *      R.gt(2, 3); //=> false\n     *      R.gt('a', 'z'); //=> false\n     *      R.gt('z', 'a'); //=> true\n     */\n    var gt = _curry2(function gt(a, b) {\n        return a > b;\n    });\n\n    /**\n     * Returns `true` if the first argument is greater than or equal to the second;\n     * `false` otherwise.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Relation\n     * @sig Ord a => a -> a -> Boolean\n     * @param {Number} a\n     * @param {Number} b\n     * @return {Boolean}\n     * @see R.lte\n     * @example\n     *\n     *      R.gte(2, 1); //=> true\n     *      R.gte(2, 2); //=> true\n     *      R.gte(2, 3); //=> false\n     *      R.gte('a', 'z'); //=> false\n     *      R.gte('z', 'a'); //=> true\n     */\n    var gte = _curry2(function gte(a, b) {\n        return a >= b;\n    });\n\n    /**\n     * Returns whether or not an object has an own property with the specified name\n     *\n     * @func\n     * @memberOf R\n     * @since v0.7.0\n     * @category Object\n     * @sig s -> {s: x} -> Boolean\n     * @param {String} prop The name of the property to check for.\n     * @param {Object} obj The object to query.\n     * @return {Boolean} Whether the property exists.\n     * @example\n     *\n     *      var hasName = R.has('name');\n     *      hasName({name: 'alice'});   //=> true\n     *      hasName({name: 'bob'});     //=> true\n     *      hasName({});                //=> false\n     *\n     *      var point = {x: 0, y: 0};\n     *      var pointHas = R.has(R.__, point);\n     *      pointHas('x');  //=> true\n     *      pointHas('y');  //=> true\n     *      pointHas('z');  //=> false\n     */\n    var has = _curry2(_has);\n\n    /**\n     * Returns whether or not an object or its prototype chain has a property with\n     * the specified name\n     *\n     * @func\n     * @memberOf R\n     * @since v0.7.0\n     * @category Object\n     * @sig s -> {s: x} -> Boolean\n     * @param {String} prop The name of the property to check for.\n     * @param {Object} obj The object to query.\n     * @return {Boolean} Whether the property exists.\n     * @example\n     *\n     *      function Rectangle(width, height) {\n     *        this.width = width;\n     *        this.height = height;\n     *      }\n     *      Rectangle.prototype.area = function() {\n     *        return this.width * this.height;\n     *      };\n     *\n     *      var square = new Rectangle(2, 2);\n     *      R.hasIn('width', square);  //=> true\n     *      R.hasIn('area', square);  //=> true\n     */\n    var hasIn = _curry2(function hasIn(prop, obj) {\n        return prop in obj;\n    });\n\n    /**\n     * Returns true if its arguments are identical, false otherwise. Values are\n     * identical if they reference the same memory. `NaN` is identical to `NaN`;\n     * `0` and `-0` are not identical.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.15.0\n     * @category Relation\n     * @sig a -> a -> Boolean\n     * @param {*} a\n     * @param {*} b\n     * @return {Boolean}\n     * @example\n     *\n     *      var o = {};\n     *      R.identical(o, o); //=> true\n     *      R.identical(1, 1); //=> true\n     *      R.identical(1, '1'); //=> false\n     *      R.identical([], []); //=> false\n     *      R.identical(0, -0); //=> false\n     *      R.identical(NaN, NaN); //=> true\n     */\n    // SameValue algorithm\n    // Steps 1-5, 7-10\n    // Steps 6.b-6.e: +0 != -0\n    // Step 6.a: NaN == NaN\n    var identical = _curry2(function identical(a, b) {\n        // SameValue algorithm\n        if (a === b) {\n            // Steps 1-5, 7-10\n            // Steps 6.b-6.e: +0 != -0\n            return a !== 0 || 1 / a === 1 / b;\n        } else {\n            // Step 6.a: NaN == NaN\n            return a !== a && b !== b;\n        }\n    });\n\n    /**\n     * A function that does nothing but return the parameter supplied to it. Good\n     * as a default or placeholder function.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Function\n     * @sig a -> a\n     * @param {*} x The value to return.\n     * @return {*} The input value, `x`.\n     * @example\n     *\n     *      R.identity(1); //=> 1\n     *\n     *      var obj = {};\n     *      R.identity(obj) === obj; //=> true\n     */\n    var identity = _curry1(_identity);\n\n    /**\n     * Creates a function that will process either the `onTrue` or the `onFalse`\n     * function depending upon the result of the `condition` predicate.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.8.0\n     * @category Logic\n     * @sig (*... -> Boolean) -> (*... -> *) -> (*... -> *) -> (*... -> *)\n     * @param {Function} condition A predicate function\n     * @param {Function} onTrue A function to invoke when the `condition` evaluates to a truthy value.\n     * @param {Function} onFalse A function to invoke when the `condition` evaluates to a falsy value.\n     * @return {Function} A new unary function that will process either the `onTrue` or the `onFalse`\n     *                    function depending upon the result of the `condition` predicate.\n     * @see R.unless, R.when\n     * @example\n     *\n     *      var incCount = R.ifElse(\n     *        R.has('count'),\n     *        R.over(R.lensProp('count'), R.inc),\n     *        R.assoc('count', 1)\n     *      );\n     *      incCount({});           //=> { count: 1 }\n     *      incCount({ count: 1 }); //=> { count: 2 }\n     */\n    var ifElse = _curry3(function ifElse(condition, onTrue, onFalse) {\n        return curryN(Math.max(condition.length, onTrue.length, onFalse.length), function _ifElse() {\n            return condition.apply(this, arguments) ? onTrue.apply(this, arguments) : onFalse.apply(this, arguments);\n        });\n    });\n\n    /**\n     * Increments its argument.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category Math\n     * @sig Number -> Number\n     * @param {Number} n\n     * @return {Number}\n     * @see R.dec\n     * @example\n     *\n     *      R.inc(42); //=> 43\n     */\n    var inc = add(1);\n\n    /**\n     * Inserts the supplied element into the list, at index `index`. _Note that\n     * this is not destructive_: it returns a copy of the list with the changes.\n     * <small>No lists have been harmed in the application of this function.</small>\n     *\n     * @func\n     * @memberOf R\n     * @since v0.2.2\n     * @category List\n     * @sig Number -> a -> [a] -> [a]\n     * @param {Number} index The position to insert the element\n     * @param {*} elt The element to insert into the Array\n     * @param {Array} list The list to insert into\n     * @return {Array} A new Array with `elt` inserted at `index`.\n     * @example\n     *\n     *      R.insert(2, 'x', [1,2,3,4]); //=> [1,2,'x',3,4]\n     */\n    var insert = _curry3(function insert(idx, elt, list) {\n        idx = idx < list.length && idx >= 0 ? idx : list.length;\n        var result = _slice(list);\n        result.splice(idx, 0, elt);\n        return result;\n    });\n\n    /**\n     * Inserts the sub-list into the list, at index `index`. _Note that this is not\n     * destructive_: it returns a copy of the list with the changes.\n     * <small>No lists have been harmed in the application of this function.</small>\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category List\n     * @sig Number -> [a] -> [a] -> [a]\n     * @param {Number} index The position to insert the sub-list\n     * @param {Array} elts The sub-list to insert into the Array\n     * @param {Array} list The list to insert the sub-list into\n     * @return {Array} A new Array with `elts` inserted starting at `index`.\n     * @example\n     *\n     *      R.insertAll(2, ['x','y','z'], [1,2,3,4]); //=> [1,2,'x','y','z',3,4]\n     */\n    var insertAll = _curry3(function insertAll(idx, elts, list) {\n        idx = idx < list.length && idx >= 0 ? idx : list.length;\n        return _concat(_concat(_slice(list, 0, idx), elts), _slice(list, idx));\n    });\n\n    /**\n     * Creates a new list with the separator interposed between elements.\n     *\n     * Dispatches to the `intersperse` method of the second argument, if present.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.14.0\n     * @category List\n     * @sig a -> [a] -> [a]\n     * @param {*} separator The element to add to the list.\n     * @param {Array} list The list to be interposed.\n     * @return {Array} The new list.\n     * @example\n     *\n     *      R.intersperse('n', ['ba', 'a', 'a']); //=> ['ba', 'n', 'a', 'n', 'a']\n     */\n    var intersperse = _curry2(_checkForMethod('intersperse', function intersperse(separator, list) {\n        var out = [];\n        var idx = 0;\n        var length = list.length;\n        while (idx < length) {\n            if (idx === length - 1) {\n                out.push(list[idx]);\n            } else {\n                out.push(list[idx], separator);\n            }\n            idx += 1;\n        }\n        return out;\n    }));\n\n    /**\n     * See if an object (`val`) is an instance of the supplied constructor. This\n     * function will check up the inheritance chain, if any.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.3.0\n     * @category Type\n     * @sig (* -> {*}) -> a -> Boolean\n     * @param {Object} ctor A constructor\n     * @param {*} val The value to test\n     * @return {Boolean}\n     * @example\n     *\n     *      R.is(Object, {}); //=> true\n     *      R.is(Number, 1); //=> true\n     *      R.is(Object, 1); //=> false\n     *      R.is(String, 's'); //=> true\n     *      R.is(String, new String('')); //=> true\n     *      R.is(Object, new String('')); //=> true\n     *      R.is(Object, 's'); //=> false\n     *      R.is(Number, {}); //=> false\n     */\n    var is = _curry2(function is(Ctor, val) {\n        return val != null && val.constructor === Ctor || val instanceof Ctor;\n    });\n\n    /**\n     * Tests whether or not an object is similar to an array.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.5.0\n     * @category Type\n     * @category List\n     * @sig * -> Boolean\n     * @param {*} x The object to test.\n     * @return {Boolean} `true` if `x` has a numeric length property and extreme indices defined; `false` otherwise.\n     * @example\n     *\n     *      R.isArrayLike([]); //=> true\n     *      R.isArrayLike(true); //=> false\n     *      R.isArrayLike({}); //=> false\n     *      R.isArrayLike({length: 10}); //=> false\n     *      R.isArrayLike({0: 'zero', 9: 'nine', length: 10}); //=> true\n     */\n    var isArrayLike = _curry1(function isArrayLike(x) {\n        if (_isArray(x)) {\n            return true;\n        }\n        if (!x) {\n            return false;\n        }\n        if (typeof x !== 'object') {\n            return false;\n        }\n        if (_isString(x)) {\n            return false;\n        }\n        if (x.nodeType === 1) {\n            return !!x.length;\n        }\n        if (x.length === 0) {\n            return true;\n        }\n        if (x.length > 0) {\n            return x.hasOwnProperty(0) && x.hasOwnProperty(x.length - 1);\n        }\n        return false;\n    });\n\n    /**\n     * Checks if the input value is `null` or `undefined`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category Type\n     * @sig * -> Boolean\n     * @param {*} x The value to test.\n     * @return {Boolean} `true` if `x` is `undefined` or `null`, otherwise `false`.\n     * @example\n     *\n     *      R.isNil(null); //=> true\n     *      R.isNil(undefined); //=> true\n     *      R.isNil(0); //=> false\n     *      R.isNil([]); //=> false\n     */\n    var isNil = _curry1(function isNil(x) {\n        return x == null;\n    });\n\n    /**\n     * Returns a list containing the names of all the enumerable own properties of\n     * the supplied object.\n     * Note that the order of the output array is not guaranteed to be consistent\n     * across different JS platforms.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Object\n     * @sig {k: v} -> [k]\n     * @param {Object} obj The object to extract properties from\n     * @return {Array} An array of the object's own properties.\n     * @example\n     *\n     *      R.keys({a: 1, b: 2, c: 3}); //=> ['a', 'b', 'c']\n     */\n    // cover IE < 9 keys issues\n    // Safari bug\n    var keys = function () {\n        // cover IE < 9 keys issues\n        var hasEnumBug = !{ toString: null }.propertyIsEnumerable('toString');\n        var nonEnumerableProps = [\n            'constructor',\n            'valueOf',\n            'isPrototypeOf',\n            'toString',\n            'propertyIsEnumerable',\n            'hasOwnProperty',\n            'toLocaleString'\n        ];\n        // Safari bug\n        var hasArgsEnumBug = function () {\n            'use strict';\n            return arguments.propertyIsEnumerable('length');\n        }();\n        var contains = function contains(list, item) {\n            var idx = 0;\n            while (idx < list.length) {\n                if (list[idx] === item) {\n                    return true;\n                }\n                idx += 1;\n            }\n            return false;\n        };\n        return typeof Object.keys === 'function' && !hasArgsEnumBug ? _curry1(function keys(obj) {\n            return Object(obj) !== obj ? [] : Object.keys(obj);\n        }) : _curry1(function keys(obj) {\n            if (Object(obj) !== obj) {\n                return [];\n            }\n            var prop, nIdx;\n            var ks = [];\n            var checkArgsLength = hasArgsEnumBug && _isArguments(obj);\n            for (prop in obj) {\n                if (_has(prop, obj) && (!checkArgsLength || prop !== 'length')) {\n                    ks[ks.length] = prop;\n                }\n            }\n            if (hasEnumBug) {\n                nIdx = nonEnumerableProps.length - 1;\n                while (nIdx >= 0) {\n                    prop = nonEnumerableProps[nIdx];\n                    if (_has(prop, obj) && !contains(ks, prop)) {\n                        ks[ks.length] = prop;\n                    }\n                    nIdx -= 1;\n                }\n            }\n            return ks;\n        });\n    }();\n\n    /**\n     * Returns a list containing the names of all the properties of the supplied\n     * object, including prototype properties.\n     * Note that the order of the output array is not guaranteed to be consistent\n     * across different JS platforms.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.2.0\n     * @category Object\n     * @sig {k: v} -> [k]\n     * @param {Object} obj The object to extract properties from\n     * @return {Array} An array of the object's own and prototype properties.\n     * @example\n     *\n     *      var F = function() { this.x = 'X'; };\n     *      F.prototype.y = 'Y';\n     *      var f = new F();\n     *      R.keysIn(f); //=> ['x', 'y']\n     */\n    var keysIn = _curry1(function keysIn(obj) {\n        var prop;\n        var ks = [];\n        for (prop in obj) {\n            ks[ks.length] = prop;\n        }\n        return ks;\n    });\n\n    /**\n     * Returns the number of elements in the array by returning `list.length`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.3.0\n     * @category List\n     * @sig [a] -> Number\n     * @param {Array} list The array to inspect.\n     * @return {Number} The length of the array.\n     * @example\n     *\n     *      R.length([]); //=> 0\n     *      R.length([1, 2, 3]); //=> 3\n     */\n    var length = _curry1(function length(list) {\n        return list != null && _isNumber(list.length) ? list.length : NaN;\n    });\n\n    /**\n     * Returns `true` if the first argument is less than the second; `false`\n     * otherwise.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Relation\n     * @sig Ord a => a -> a -> Boolean\n     * @param {*} a\n     * @param {*} b\n     * @return {Boolean}\n     * @see R.gt\n     * @example\n     *\n     *      R.lt(2, 1); //=> false\n     *      R.lt(2, 2); //=> false\n     *      R.lt(2, 3); //=> true\n     *      R.lt('a', 'z'); //=> true\n     *      R.lt('z', 'a'); //=> false\n     */\n    var lt = _curry2(function lt(a, b) {\n        return a < b;\n    });\n\n    /**\n     * Returns `true` if the first argument is less than or equal to the second;\n     * `false` otherwise.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Relation\n     * @sig Ord a => a -> a -> Boolean\n     * @param {Number} a\n     * @param {Number} b\n     * @return {Boolean}\n     * @see R.gte\n     * @example\n     *\n     *      R.lte(2, 1); //=> false\n     *      R.lte(2, 2); //=> true\n     *      R.lte(2, 3); //=> true\n     *      R.lte('a', 'z'); //=> true\n     *      R.lte('z', 'a'); //=> false\n     */\n    var lte = _curry2(function lte(a, b) {\n        return a <= b;\n    });\n\n    /**\n     * The mapAccum function behaves like a combination of map and reduce; it\n     * applies a function to each element of a list, passing an accumulating\n     * parameter from left to right, and returning a final value of this\n     * accumulator together with the new list.\n     *\n     * The iterator function receives two arguments, *acc* and *value*, and should\n     * return a tuple *[acc, value]*.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.10.0\n     * @category List\n     * @sig (acc -> x -> (acc, y)) -> acc -> [x] -> (acc, [y])\n     * @param {Function} fn The function to be called on every element of the input `list`.\n     * @param {*} acc The accumulator value.\n     * @param {Array} list The list to iterate over.\n     * @return {*} The final, accumulated value.\n     * @see R.addIndex\n     * @example\n     *\n     *      var digits = ['1', '2', '3', '4'];\n     *      var appender = (a, b) => [a + b, a + b];\n     *\n     *      R.mapAccum(appender, 0, digits); //=> ['01234', ['01', '012', '0123', '01234']]\n     */\n    var mapAccum = _curry3(function mapAccum(fn, acc, list) {\n        var idx = 0;\n        var len = list.length;\n        var result = [];\n        var tuple = [acc];\n        while (idx < len) {\n            tuple = fn(tuple[0], list[idx]);\n            result[idx] = tuple[1];\n            idx += 1;\n        }\n        return [\n            tuple[0],\n            result\n        ];\n    });\n\n    /**\n     * The mapAccumRight function behaves like a combination of map and reduce; it\n     * applies a function to each element of a list, passing an accumulating\n     * parameter from right to left, and returning a final value of this\n     * accumulator together with the new list.\n     *\n     * Similar to `mapAccum`, except moves through the input list from the right to\n     * the left.\n     *\n     * The iterator function receives two arguments, *acc* and *value*, and should\n     * return a tuple *[acc, value]*.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.10.0\n     * @category List\n     * @sig (acc -> x -> (acc, y)) -> acc -> [x] -> (acc, [y])\n     * @param {Function} fn The function to be called on every element of the input `list`.\n     * @param {*} acc The accumulator value.\n     * @param {Array} list The list to iterate over.\n     * @return {*} The final, accumulated value.\n     * @see R.addIndex\n     * @example\n     *\n     *      var digits = ['1', '2', '3', '4'];\n     *      var append = (a, b) => [a + b, a + b];\n     *\n     *      R.mapAccumRight(append, 0, digits); //=> ['04321', ['04321', '0432', '043', '04']]\n     */\n    var mapAccumRight = _curry3(function mapAccumRight(fn, acc, list) {\n        var idx = list.length - 1;\n        var result = [];\n        var tuple = [acc];\n        while (idx >= 0) {\n            tuple = fn(tuple[0], list[idx]);\n            result[idx] = tuple[1];\n            idx -= 1;\n        }\n        return [\n            tuple[0],\n            result\n        ];\n    });\n\n    /**\n     * Tests a regular expression against a String. Note that this function will\n     * return an empty array when there are no matches. This differs from\n     * [`String.prototype.match`](https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/String/match)\n     * which returns `null` when there are no matches.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category String\n     * @sig RegExp -> String -> [String | Undefined]\n     * @param {RegExp} rx A regular expression.\n     * @param {String} str The string to match against\n     * @return {Array} The list of matches or empty array.\n     * @see R.test\n     * @example\n     *\n     *      R.match(/([a-z]a)/g, 'bananas'); //=> ['ba', 'na', 'na']\n     *      R.match(/a/, 'b'); //=> []\n     *      R.match(/a/, null); //=> TypeError: null does not have a method named \"match\"\n     */\n    var match = _curry2(function match(rx, str) {\n        return str.match(rx) || [];\n    });\n\n    /**\n     * mathMod behaves like the modulo operator should mathematically, unlike the\n     * `%` operator (and by extension, R.modulo). So while \"-17 % 5\" is -2,\n     * mathMod(-17, 5) is 3. mathMod requires Integer arguments, and returns NaN\n     * when the modulus is zero or negative.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.3.0\n     * @category Math\n     * @sig Number -> Number -> Number\n     * @param {Number} m The dividend.\n     * @param {Number} p the modulus.\n     * @return {Number} The result of `b mod a`.\n     * @example\n     *\n     *      R.mathMod(-17, 5);  //=> 3\n     *      R.mathMod(17, 5);   //=> 2\n     *      R.mathMod(17, -5);  //=> NaN\n     *      R.mathMod(17, 0);   //=> NaN\n     *      R.mathMod(17.2, 5); //=> NaN\n     *      R.mathMod(17, 5.3); //=> NaN\n     *\n     *      var clock = R.mathMod(R.__, 12);\n     *      clock(15); //=> 3\n     *      clock(24); //=> 0\n     *\n     *      var seventeenMod = R.mathMod(17);\n     *      seventeenMod(3);  //=> 2\n     *      seventeenMod(4);  //=> 1\n     *      seventeenMod(10); //=> 7\n     */\n    var mathMod = _curry2(function mathMod(m, p) {\n        if (!_isInteger(m)) {\n            return NaN;\n        }\n        if (!_isInteger(p) || p < 1) {\n            return NaN;\n        }\n        return (m % p + p) % p;\n    });\n\n    /**\n     * Returns the larger of its two arguments.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Relation\n     * @sig Ord a => a -> a -> a\n     * @param {*} a\n     * @param {*} b\n     * @return {*}\n     * @see R.maxBy, R.min\n     * @example\n     *\n     *      R.max(789, 123); //=> 789\n     *      R.max('a', 'b'); //=> 'b'\n     */\n    var max = _curry2(function max(a, b) {\n        return b > a ? b : a;\n    });\n\n    /**\n     * Takes a function and two values, and returns whichever value produces the\n     * larger result when passed to the provided function.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.8.0\n     * @category Relation\n     * @sig Ord b => (a -> b) -> a -> a -> a\n     * @param {Function} f\n     * @param {*} a\n     * @param {*} b\n     * @return {*}\n     * @see R.max, R.minBy\n     * @example\n     *\n     *      //  square :: Number -> Number\n     *      var square = n => n * n;\n     *\n     *      R.maxBy(square, -3, 2); //=> -3\n     *\n     *      R.reduce(R.maxBy(square), 0, [3, -5, 4, 1, -2]); //=> -5\n     *      R.reduce(R.maxBy(square), 0, []); //=> 0\n     */\n    var maxBy = _curry3(function maxBy(f, a, b) {\n        return f(b) > f(a) ? b : a;\n    });\n\n    /**\n     * Create a new object with the own properties of the first object merged with\n     * the own properties of the second object. If a key exists in both objects,\n     * the value from the second object will be used.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Object\n     * @sig {k: v} -> {k: v} -> {k: v}\n     * @param {Object} l\n     * @param {Object} r\n     * @return {Object}\n     * @see R.mergeWith, R.mergeWithKey\n     * @example\n     *\n     *      R.merge({ 'name': 'fred', 'age': 10 }, { 'age': 40 });\n     *      //=> { 'name': 'fred', 'age': 40 }\n     *\n     *      var resetToDefault = R.merge(R.__, {x: 0});\n     *      resetToDefault({x: 5, y: 2}); //=> {x: 0, y: 2}\n     */\n    var merge = _curry2(function merge(l, r) {\n        return _assign({}, l, r);\n    });\n\n    /**\n     * Merges a list of objects together into one object.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.10.0\n     * @category List\n     * @sig [{k: v}] -> {k: v}\n     * @param {Array} list An array of objects\n     * @return {Object} A merged object.\n     * @see R.reduce\n     * @example\n     *\n     *      R.mergeAll([{foo:1},{bar:2},{baz:3}]); //=> {foo:1,bar:2,baz:3}\n     *      R.mergeAll([{foo:1},{foo:2},{bar:2}]); //=> {foo:2,bar:2}\n     */\n    var mergeAll = _curry1(function mergeAll(list) {\n        return _assign.apply(null, [{}].concat(list));\n    });\n\n    /**\n     * Creates a new object with the own properties of the two provided objects. If\n     * a key exists in both objects, the provided function is applied to the key\n     * and the values associated with the key in each object, with the result being\n     * used as the value associated with the key in the returned object. The key\n     * will be excluded from the returned object if the resulting value is\n     * `undefined`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.19.0\n     * @category Object\n     * @sig (String -> a -> a -> a) -> {a} -> {a} -> {a}\n     * @param {Function} fn\n     * @param {Object} l\n     * @param {Object} r\n     * @return {Object}\n     * @see R.merge, R.mergeWith\n     * @example\n     *\n     *      let concatValues = (k, l, r) => k == 'values' ? R.concat(l, r) : r\n     *      R.mergeWithKey(concatValues,\n     *                     { a: true, thing: 'foo', values: [10, 20] },\n     *                     { b: true, thing: 'bar', values: [15, 35] });\n     *      //=> { a: true, b: true, thing: 'bar', values: [10, 20, 15, 35] }\n     */\n    var mergeWithKey = _curry3(function mergeWithKey(fn, l, r) {\n        var result = {};\n        var k;\n        for (k in l) {\n            if (_has(k, l)) {\n                result[k] = _has(k, r) ? fn(k, l[k], r[k]) : l[k];\n            }\n        }\n        for (k in r) {\n            if (_has(k, r) && !_has(k, result)) {\n                result[k] = r[k];\n            }\n        }\n        return result;\n    });\n\n    /**\n     * Returns the smaller of its two arguments.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Relation\n     * @sig Ord a => a -> a -> a\n     * @param {*} a\n     * @param {*} b\n     * @return {*}\n     * @see R.minBy, R.max\n     * @example\n     *\n     *      R.min(789, 123); //=> 123\n     *      R.min('a', 'b'); //=> 'a'\n     */\n    var min = _curry2(function min(a, b) {\n        return b < a ? b : a;\n    });\n\n    /**\n     * Takes a function and two values, and returns whichever value produces the\n     * smaller result when passed to the provided function.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.8.0\n     * @category Relation\n     * @sig Ord b => (a -> b) -> a -> a -> a\n     * @param {Function} f\n     * @param {*} a\n     * @param {*} b\n     * @return {*}\n     * @see R.min, R.maxBy\n     * @example\n     *\n     *      //  square :: Number -> Number\n     *      var square = n => n * n;\n     *\n     *      R.minBy(square, -3, 2); //=> 2\n     *\n     *      R.reduce(R.minBy(square), Infinity, [3, -5, 4, 1, -2]); //=> 1\n     *      R.reduce(R.minBy(square), Infinity, []); //=> Infinity\n     */\n    var minBy = _curry3(function minBy(f, a, b) {\n        return f(b) < f(a) ? b : a;\n    });\n\n    /**\n     * Divides the first parameter by the second and returns the remainder. Note\n     * that this function preserves the JavaScript-style behavior for modulo. For\n     * mathematical modulo see `mathMod`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.1\n     * @category Math\n     * @sig Number -> Number -> Number\n     * @param {Number} a The value to the divide.\n     * @param {Number} b The pseudo-modulus\n     * @return {Number} The result of `b % a`.\n     * @see R.mathMod\n     * @example\n     *\n     *      R.modulo(17, 3); //=> 2\n     *      // JS behavior:\n     *      R.modulo(-17, 3); //=> -2\n     *      R.modulo(17, -3); //=> 2\n     *\n     *      var isOdd = R.modulo(R.__, 2);\n     *      isOdd(42); //=> 0\n     *      isOdd(21); //=> 1\n     */\n    var modulo = _curry2(function modulo(a, b) {\n        return a % b;\n    });\n\n    /**\n     * Multiplies two numbers. Equivalent to `a * b` but curried.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Math\n     * @sig Number -> Number -> Number\n     * @param {Number} a The first value.\n     * @param {Number} b The second value.\n     * @return {Number} The result of `a * b`.\n     * @see R.divide\n     * @example\n     *\n     *      var double = R.multiply(2);\n     *      var triple = R.multiply(3);\n     *      double(3);       //=>  6\n     *      triple(4);       //=> 12\n     *      R.multiply(2, 5);  //=> 10\n     */\n    var multiply = _curry2(function multiply(a, b) {\n        return a * b;\n    });\n\n    /**\n     * Wraps a function of any arity (including nullary) in a function that accepts\n     * exactly `n` parameters. Any extraneous parameters will not be passed to the\n     * supplied function.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Function\n     * @sig Number -> (* -> a) -> (* -> a)\n     * @param {Number} n The desired arity of the new function.\n     * @param {Function} fn The function to wrap.\n     * @return {Function} A new function wrapping `fn`. The new function is guaranteed to be of\n     *         arity `n`.\n     * @example\n     *\n     *      var takesTwoArgs = (a, b) => [a, b];\n     *\n     *      takesTwoArgs.length; //=> 2\n     *      takesTwoArgs(1, 2); //=> [1, 2]\n     *\n     *      var takesOneArg = R.nAry(1, takesTwoArgs);\n     *      takesOneArg.length; //=> 1\n     *      // Only `n` arguments are passed to the wrapped function\n     *      takesOneArg(1, 2); //=> [1, undefined]\n     */\n    var nAry = _curry2(function nAry(n, fn) {\n        switch (n) {\n        case 0:\n            return function () {\n                return fn.call(this);\n            };\n        case 1:\n            return function (a0) {\n                return fn.call(this, a0);\n            };\n        case 2:\n            return function (a0, a1) {\n                return fn.call(this, a0, a1);\n            };\n        case 3:\n            return function (a0, a1, a2) {\n                return fn.call(this, a0, a1, a2);\n            };\n        case 4:\n            return function (a0, a1, a2, a3) {\n                return fn.call(this, a0, a1, a2, a3);\n            };\n        case 5:\n            return function (a0, a1, a2, a3, a4) {\n                return fn.call(this, a0, a1, a2, a3, a4);\n            };\n        case 6:\n            return function (a0, a1, a2, a3, a4, a5) {\n                return fn.call(this, a0, a1, a2, a3, a4, a5);\n            };\n        case 7:\n            return function (a0, a1, a2, a3, a4, a5, a6) {\n                return fn.call(this, a0, a1, a2, a3, a4, a5, a6);\n            };\n        case 8:\n            return function (a0, a1, a2, a3, a4, a5, a6, a7) {\n                return fn.call(this, a0, a1, a2, a3, a4, a5, a6, a7);\n            };\n        case 9:\n            return function (a0, a1, a2, a3, a4, a5, a6, a7, a8) {\n                return fn.call(this, a0, a1, a2, a3, a4, a5, a6, a7, a8);\n            };\n        case 10:\n            return function (a0, a1, a2, a3, a4, a5, a6, a7, a8, a9) {\n                return fn.call(this, a0, a1, a2, a3, a4, a5, a6, a7, a8, a9);\n            };\n        default:\n            throw new Error('First argument to nAry must be a non-negative integer no greater than ten');\n        }\n    });\n\n    /**\n     * Negates its argument.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category Math\n     * @sig Number -> Number\n     * @param {Number} n\n     * @return {Number}\n     * @example\n     *\n     *      R.negate(42); //=> -42\n     */\n    var negate = _curry1(function negate(n) {\n        return -n;\n    });\n\n    /**\n     * Returns `true` if no elements of the list match the predicate, `false`\n     * otherwise.\n     *\n     * Dispatches to the `any` method of the second argument, if present.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.12.0\n     * @category List\n     * @sig (a -> Boolean) -> [a] -> Boolean\n     * @param {Function} fn The predicate function.\n     * @param {Array} list The array to consider.\n     * @return {Boolean} `true` if the predicate is not satisfied by every element, `false` otherwise.\n     * @see R.all, R.any\n     * @example\n     *\n     *      var isEven = n => n % 2 === 0;\n     *\n     *      R.none(isEven, [1, 3, 5, 7, 9, 11]); //=> true\n     *      R.none(isEven, [1, 3, 5, 7, 8, 11]); //=> false\n     */\n    var none = _curry2(_complement(_dispatchable('any', _xany, any)));\n\n    /**\n     * A function that returns the `!` of its argument. It will return `true` when\n     * passed false-y value, and `false` when passed a truth-y one.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Logic\n     * @sig * -> Boolean\n     * @param {*} a any value\n     * @return {Boolean} the logical inverse of passed argument.\n     * @see R.complement\n     * @example\n     *\n     *      R.not(true); //=> false\n     *      R.not(false); //=> true\n     *      R.not(0); //=> true\n     *      R.not(1); //=> false\n     */\n    var not = _curry1(function not(a) {\n        return !a;\n    });\n\n    /**\n     * Returns the nth element of the given list or string. If n is negative the\n     * element at index length + n is returned.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig Number -> [a] -> a | Undefined\n     * @sig Number -> String -> String\n     * @param {Number} offset\n     * @param {*} list\n     * @return {*}\n     * @example\n     *\n     *      var list = ['foo', 'bar', 'baz', 'quux'];\n     *      R.nth(1, list); //=> 'bar'\n     *      R.nth(-1, list); //=> 'quux'\n     *      R.nth(-99, list); //=> undefined\n     *\n     *      R.nth(2, 'abc'); //=> 'c'\n     *      R.nth(3, 'abc'); //=> ''\n     */\n    var nth = _curry2(function nth(offset, list) {\n        var idx = offset < 0 ? list.length + offset : offset;\n        return _isString(list) ? list.charAt(idx) : list[idx];\n    });\n\n    /**\n     * Returns a function which returns its nth argument.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category Function\n     * @sig Number -> *... -> *\n     * @param {Number} n\n     * @return {Function}\n     * @example\n     *\n     *      R.nthArg(1)('a', 'b', 'c'); //=> 'b'\n     *      R.nthArg(-1)('a', 'b', 'c'); //=> 'c'\n     */\n    var nthArg = _curry1(function nthArg(n) {\n        var arity = n < 0 ? 1 : n + 1;\n        return curryN(arity, function () {\n            return nth(n, arguments);\n        });\n    });\n\n    /**\n     * Creates an object containing a single key:value pair.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.18.0\n     * @category Object\n     * @sig String -> a -> {String:a}\n     * @param {String} key\n     * @param {*} val\n     * @return {Object}\n     * @see R.pair\n     * @example\n     *\n     *      var matchPhrases = R.compose(\n     *        R.objOf('must'),\n     *        R.map(R.objOf('match_phrase'))\n     *      );\n     *      matchPhrases(['foo', 'bar', 'baz']); //=> {must: [{match_phrase: 'foo'}, {match_phrase: 'bar'}, {match_phrase: 'baz'}]}\n     */\n    var objOf = _curry2(function objOf(key, val) {\n        var obj = {};\n        obj[key] = val;\n        return obj;\n    });\n\n    /**\n     * Returns a singleton array containing the value provided.\n     *\n     * Note this `of` is different from the ES6 `of`; See\n     * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/of\n     *\n     * @func\n     * @memberOf R\n     * @since v0.3.0\n     * @category Function\n     * @sig a -> [a]\n     * @param {*} x any value\n     * @return {Array} An array wrapping `x`.\n     * @example\n     *\n     *      R.of(null); //=> [null]\n     *      R.of([42]); //=> [[42]]\n     */\n    var of = _curry1(_of);\n\n    /**\n     * Accepts a function `fn` and returns a function that guards invocation of\n     * `fn` such that `fn` can only ever be called once, no matter how many times\n     * the returned function is invoked. The first value calculated is returned in\n     * subsequent invocations.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Function\n     * @sig (a... -> b) -> (a... -> b)\n     * @param {Function} fn The function to wrap in a call-only-once wrapper.\n     * @return {Function} The wrapped function.\n     * @example\n     *\n     *      var addOneOnce = R.once(x => x + 1);\n     *      addOneOnce(10); //=> 11\n     *      addOneOnce(addOneOnce(50)); //=> 11\n     */\n    var once = _curry1(function once(fn) {\n        var called = false;\n        var result;\n        return _arity(fn.length, function () {\n            if (called) {\n                return result;\n            }\n            called = true;\n            result = fn.apply(this, arguments);\n            return result;\n        });\n    });\n\n    /**\n     * Returns `true` if one or both of its arguments are `true`. Returns `false`\n     * if both arguments are `false`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Logic\n     * @sig * -> * -> *\n     * @param {Boolean} a A boolean value\n     * @param {Boolean} b A boolean value\n     * @return {Boolean} `true` if one or both arguments are `true`, `false` otherwise\n     * @see R.either\n     * @example\n     *\n     *      R.or(true, true); //=> true\n     *      R.or(true, false); //=> true\n     *      R.or(false, true); //=> true\n     *      R.or(false, false); //=> false\n     */\n    var or = _curry2(function or(a, b) {\n        return a || b;\n    });\n\n    /**\n     * Returns the result of \"setting\" the portion of the given data structure\n     * focused by the given lens to the result of applying the given function to\n     * the focused value.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.16.0\n     * @category Object\n     * @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s\n     * @sig Lens s a -> (a -> a) -> s -> s\n     * @param {Lens} lens\n     * @param {*} v\n     * @param {*} x\n     * @return {*}\n     * @see R.prop, R.lensIndex, R.lensProp\n     * @example\n     *\n     *      var headLens = R.lensIndex(0);\n     *\n     *      R.over(headLens, R.toUpper, ['foo', 'bar', 'baz']); //=> ['FOO', 'bar', 'baz']\n     */\n    // `Identity` is a functor that holds a single value, where `map` simply\n    // transforms the held value with the provided function.\n    // The value returned by the getter function is first transformed with `f`,\n    // then set as the value of an `Identity`. This is then mapped over with the\n    // setter function of the lens.\n    var over = function () {\n        // `Identity` is a functor that holds a single value, where `map` simply\n        // transforms the held value with the provided function.\n        var Identity = function (x) {\n            return {\n                value: x,\n                map: function (f) {\n                    return Identity(f(x));\n                }\n            };\n        };\n        return _curry3(function over(lens, f, x) {\n            // The value returned by the getter function is first transformed with `f`,\n            // then set as the value of an `Identity`. This is then mapped over with the\n            // setter function of the lens.\n            return lens(function (y) {\n                return Identity(f(y));\n            })(x).value;\n        });\n    }();\n\n    /**\n     * Takes two arguments, `fst` and `snd`, and returns `[fst, snd]`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.18.0\n     * @category List\n     * @sig a -> b -> (a,b)\n     * @param {*} fst\n     * @param {*} snd\n     * @return {Array}\n     * @see R.objOf, R.of\n     * @example\n     *\n     *      R.pair('foo', 'bar'); //=> ['foo', 'bar']\n     */\n    var pair = _curry2(function pair(fst, snd) {\n        return [\n            fst,\n            snd\n        ];\n    });\n\n    /**\n     * Retrieve the value at a given path.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.2.0\n     * @category Object\n     * @sig [String] -> {k: v} -> v | Undefined\n     * @param {Array} path The path to use.\n     * @param {Object} obj The object to retrieve the nested property from.\n     * @return {*} The data at `path`.\n     * @see R.prop\n     * @example\n     *\n     *      R.path(['a', 'b'], {a: {b: 2}}); //=> 2\n     *      R.path(['a', 'b'], {c: {b: 2}}); //=> undefined\n     */\n    var path = _curry2(function path(paths, obj) {\n        var val = obj;\n        var idx = 0;\n        while (idx < paths.length) {\n            if (val == null) {\n                return;\n            }\n            val = val[paths[idx]];\n            idx += 1;\n        }\n        return val;\n    });\n\n    /**\n     * If the given, non-null object has a value at the given path, returns the\n     * value at that path. Otherwise returns the provided default value.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.18.0\n     * @category Object\n     * @sig a -> [String] -> Object -> a\n     * @param {*} d The default value.\n     * @param {Array} p The path to use.\n     * @param {Object} obj The object to retrieve the nested property from.\n     * @return {*} The data at `path` of the supplied object or the default value.\n     * @example\n     *\n     *      R.pathOr('N/A', ['a', 'b'], {a: {b: 2}}); //=> 2\n     *      R.pathOr('N/A', ['a', 'b'], {c: {b: 2}}); //=> \"N/A\"\n     */\n    var pathOr = _curry3(function pathOr(d, p, obj) {\n        return defaultTo(d, path(p, obj));\n    });\n\n    /**\n     * Returns `true` if the specified object property at given path satisfies the\n     * given predicate; `false` otherwise.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.19.0\n     * @category Logic\n     * @sig (a -> Boolean) -> [String] -> Object -> Boolean\n     * @param {Function} pred\n     * @param {Array} propPath\n     * @param {*} obj\n     * @return {Boolean}\n     * @see R.propSatisfies, R.path\n     * @example\n     *\n     *      R.pathSatisfies(y => y > 0, ['x', 'y'], {x: {y: 2}}); //=> true\n     */\n    var pathSatisfies = _curry3(function pathSatisfies(pred, propPath, obj) {\n        return propPath.length > 0 && pred(path(propPath, obj));\n    });\n\n    /**\n     * Returns a partial copy of an object containing only the keys specified. If\n     * the key does not exist, the property is ignored.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Object\n     * @sig [k] -> {k: v} -> {k: v}\n     * @param {Array} names an array of String property names to copy onto a new object\n     * @param {Object} obj The object to copy from\n     * @return {Object} A new object with only properties from `names` on it.\n     * @see R.omit, R.props\n     * @example\n     *\n     *      R.pick(['a', 'd'], {a: 1, b: 2, c: 3, d: 4}); //=> {a: 1, d: 4}\n     *      R.pick(['a', 'e', 'f'], {a: 1, b: 2, c: 3, d: 4}); //=> {a: 1}\n     */\n    var pick = _curry2(function pick(names, obj) {\n        var result = {};\n        var idx = 0;\n        while (idx < names.length) {\n            if (names[idx] in obj) {\n                result[names[idx]] = obj[names[idx]];\n            }\n            idx += 1;\n        }\n        return result;\n    });\n\n    /**\n     * Similar to `pick` except that this one includes a `key: undefined` pair for\n     * properties that don't exist.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Object\n     * @sig [k] -> {k: v} -> {k: v}\n     * @param {Array} names an array of String property names to copy onto a new object\n     * @param {Object} obj The object to copy from\n     * @return {Object} A new object with only properties from `names` on it.\n     * @see R.pick\n     * @example\n     *\n     *      R.pickAll(['a', 'd'], {a: 1, b: 2, c: 3, d: 4}); //=> {a: 1, d: 4}\n     *      R.pickAll(['a', 'e', 'f'], {a: 1, b: 2, c: 3, d: 4}); //=> {a: 1, e: undefined, f: undefined}\n     */\n    var pickAll = _curry2(function pickAll(names, obj) {\n        var result = {};\n        var idx = 0;\n        var len = names.length;\n        while (idx < len) {\n            var name = names[idx];\n            result[name] = obj[name];\n            idx += 1;\n        }\n        return result;\n    });\n\n    /**\n     * Returns a partial copy of an object containing only the keys that satisfy\n     * the supplied predicate.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.8.0\n     * @category Object\n     * @sig (v, k -> Boolean) -> {k: v} -> {k: v}\n     * @param {Function} pred A predicate to determine whether or not a key\n     *        should be included on the output object.\n     * @param {Object} obj The object to copy from\n     * @return {Object} A new object with only properties that satisfy `pred`\n     *         on it.\n     * @see R.pick, R.filter\n     * @example\n     *\n     *      var isUpperCase = (val, key) => key.toUpperCase() === key;\n     *      R.pickBy(isUpperCase, {a: 1, b: 2, A: 3, B: 4}); //=> {A: 3, B: 4}\n     */\n    var pickBy = _curry2(function pickBy(test, obj) {\n        var result = {};\n        for (var prop in obj) {\n            if (test(obj[prop], prop, obj)) {\n                result[prop] = obj[prop];\n            }\n        }\n        return result;\n    });\n\n    /**\n     * Returns a new list with the given element at the front, followed by the\n     * contents of the list.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig a -> [a] -> [a]\n     * @param {*} el The item to add to the head of the output list.\n     * @param {Array} list The array to add to the tail of the output list.\n     * @return {Array} A new array.\n     * @see R.append\n     * @example\n     *\n     *      R.prepend('fee', ['fi', 'fo', 'fum']); //=> ['fee', 'fi', 'fo', 'fum']\n     */\n    var prepend = _curry2(function prepend(el, list) {\n        return _concat([el], list);\n    });\n\n    /**\n     * Returns a function that when supplied an object returns the indicated\n     * property of that object, if it exists.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Object\n     * @sig s -> {s: a} -> a | Undefined\n     * @param {String} p The property name\n     * @param {Object} obj The object to query\n     * @return {*} The value at `obj.p`.\n     * @see R.path\n     * @example\n     *\n     *      R.prop('x', {x: 100}); //=> 100\n     *      R.prop('x', {}); //=> undefined\n     */\n    var prop = _curry2(function prop(p, obj) {\n        return obj[p];\n    });\n\n    /**\n     * Returns `true` if the specified object property is of the given type;\n     * `false` otherwise.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.16.0\n     * @category Type\n     * @sig Type -> String -> Object -> Boolean\n     * @param {Function} type\n     * @param {String} name\n     * @param {*} obj\n     * @return {Boolean}\n     * @see R.is, R.propSatisfies\n     * @example\n     *\n     *      R.propIs(Number, 'x', {x: 1, y: 2});  //=> true\n     *      R.propIs(Number, 'x', {x: 'foo'});    //=> false\n     *      R.propIs(Number, 'x', {});            //=> false\n     */\n    var propIs = _curry3(function propIs(type, name, obj) {\n        return is(type, obj[name]);\n    });\n\n    /**\n     * If the given, non-null object has an own property with the specified name,\n     * returns the value of that property. Otherwise returns the provided default\n     * value.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.6.0\n     * @category Object\n     * @sig a -> String -> Object -> a\n     * @param {*} val The default value.\n     * @param {String} p The name of the property to return.\n     * @param {Object} obj The object to query.\n     * @return {*} The value of given property of the supplied object or the default value.\n     * @example\n     *\n     *      var alice = {\n     *        name: 'ALICE',\n     *        age: 101\n     *      };\n     *      var favorite = R.prop('favoriteLibrary');\n     *      var favoriteWithDefault = R.propOr('Ramda', 'favoriteLibrary');\n     *\n     *      favorite(alice);  //=> undefined\n     *      favoriteWithDefault(alice);  //=> 'Ramda'\n     */\n    var propOr = _curry3(function propOr(val, p, obj) {\n        return obj != null && _has(p, obj) ? obj[p] : val;\n    });\n\n    /**\n     * Returns `true` if the specified object property satisfies the given\n     * predicate; `false` otherwise.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.16.0\n     * @category Logic\n     * @sig (a -> Boolean) -> String -> {String: a} -> Boolean\n     * @param {Function} pred\n     * @param {String} name\n     * @param {*} obj\n     * @return {Boolean}\n     * @see R.propEq, R.propIs\n     * @example\n     *\n     *      R.propSatisfies(x => x > 0, 'x', {x: 1, y: 2}); //=> true\n     */\n    var propSatisfies = _curry3(function propSatisfies(pred, name, obj) {\n        return pred(obj[name]);\n    });\n\n    /**\n     * Acts as multiple `prop`: array of keys in, array of values out. Preserves\n     * order.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Object\n     * @sig [k] -> {k: v} -> [v]\n     * @param {Array} ps The property names to fetch\n     * @param {Object} obj The object to query\n     * @return {Array} The corresponding values or partially applied function.\n     * @example\n     *\n     *      R.props(['x', 'y'], {x: 1, y: 2}); //=> [1, 2]\n     *      R.props(['c', 'a', 'b'], {b: 2, a: 1}); //=> [undefined, 1, 2]\n     *\n     *      var fullName = R.compose(R.join(' '), R.props(['first', 'last']));\n     *      fullName({last: 'Bullet-Tooth', age: 33, first: 'Tony'}); //=> 'Tony Bullet-Tooth'\n     */\n    var props = _curry2(function props(ps, obj) {\n        var len = ps.length;\n        var out = [];\n        var idx = 0;\n        while (idx < len) {\n            out[idx] = obj[ps[idx]];\n            idx += 1;\n        }\n        return out;\n    });\n\n    /**\n     * Returns a list of numbers from `from` (inclusive) to `to` (exclusive).\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig Number -> Number -> [Number]\n     * @param {Number} from The first number in the list.\n     * @param {Number} to One more than the last number in the list.\n     * @return {Array} The list of numbers in tthe set `[a, b)`.\n     * @example\n     *\n     *      R.range(1, 5);    //=> [1, 2, 3, 4]\n     *      R.range(50, 53);  //=> [50, 51, 52]\n     */\n    var range = _curry2(function range(from, to) {\n        if (!(_isNumber(from) && _isNumber(to))) {\n            throw new TypeError('Both arguments to range must be numbers');\n        }\n        var result = [];\n        var n = from;\n        while (n < to) {\n            result.push(n);\n            n += 1;\n        }\n        return result;\n    });\n\n    /**\n     * Returns a single item by iterating through the list, successively calling\n     * the iterator function and passing it an accumulator value and the current\n     * value from the array, and then passing the result to the next call.\n     *\n     * Similar to `reduce`, except moves through the input list from the right to\n     * the left.\n     *\n     * The iterator function receives two values: *(acc, value)*\n     *\n     * Note: `R.reduceRight` does not skip deleted or unassigned indices (sparse\n     * arrays), unlike the native `Array.prototype.reduce` method. For more details\n     * on this behavior, see:\n     * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduceRight#Description\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig (a,b -> a) -> a -> [b] -> a\n     * @param {Function} fn The iterator function. Receives two values, the accumulator and the\n     *        current element from the array.\n     * @param {*} acc The accumulator value.\n     * @param {Array} list The list to iterate over.\n     * @return {*} The final, accumulated value.\n     * @see R.addIndex\n     * @example\n     *\n     *      var pairs = [ ['a', 1], ['b', 2], ['c', 3] ];\n     *      var flattenPairs = (acc, pair) => acc.concat(pair);\n     *\n     *      R.reduceRight(flattenPairs, [], pairs); //=> [ 'c', 3, 'b', 2, 'a', 1 ]\n     */\n    var reduceRight = _curry3(function reduceRight(fn, acc, list) {\n        var idx = list.length - 1;\n        while (idx >= 0) {\n            acc = fn(acc, list[idx]);\n            idx -= 1;\n        }\n        return acc;\n    });\n\n    /**\n     * Returns a value wrapped to indicate that it is the final value of the reduce\n     * and transduce functions. The returned value should be considered a black\n     * box: the internal structure is not guaranteed to be stable.\n     *\n     * Note: this optimization is unavailable to functions not explicitly listed\n     * above. For instance, it is not currently supported by reduceRight.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.15.0\n     * @category List\n     * @sig a -> *\n     * @param {*} x The final value of the reduce.\n     * @return {*} The wrapped value.\n     * @see R.reduce, R.transduce\n     * @example\n     *\n     *      R.reduce(\n     *        R.pipe(R.add, R.when(R.gte(R.__, 10), R.reduced)),\n     *        0,\n     *        [1, 2, 3, 4, 5]) // 10\n     */\n    var reduced = _curry1(_reduced);\n\n    /**\n     * Removes the sub-list of `list` starting at index `start` and containing\n     * `count` elements. _Note that this is not destructive_: it returns a copy of\n     * the list with the changes.\n     * <small>No lists have been harmed in the application of this function.</small>\n     *\n     * @func\n     * @memberOf R\n     * @since v0.2.2\n     * @category List\n     * @sig Number -> Number -> [a] -> [a]\n     * @param {Number} start The position to start removing elements\n     * @param {Number} count The number of elements to remove\n     * @param {Array} list The list to remove from\n     * @return {Array} A new Array with `count` elements from `start` removed.\n     * @example\n     *\n     *      R.remove(2, 3, [1,2,3,4,5,6,7,8]); //=> [1,2,6,7,8]\n     */\n    var remove = _curry3(function remove(start, count, list) {\n        return _concat(_slice(list, 0, Math.min(start, list.length)), _slice(list, Math.min(list.length, start + count)));\n    });\n\n    /**\n     * Replace a substring or regex match in a string with a replacement.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.7.0\n     * @category String\n     * @sig RegExp|String -> String -> String -> String\n     * @param {RegExp|String} pattern A regular expression or a substring to match.\n     * @param {String} replacement The string to replace the matches with.\n     * @param {String} str The String to do the search and replacement in.\n     * @return {String} The result.\n     * @example\n     *\n     *      R.replace('foo', 'bar', 'foo foo foo'); //=> 'bar foo foo'\n     *      R.replace(/foo/, 'bar', 'foo foo foo'); //=> 'bar foo foo'\n     *\n     *      // Use the \"g\" (global) flag to replace all occurrences:\n     *      R.replace(/foo/g, 'bar', 'foo foo foo'); //=> 'bar bar bar'\n     */\n    var replace = _curry3(function replace(regex, replacement, str) {\n        return str.replace(regex, replacement);\n    });\n\n    /**\n     * Returns a new list or string with the elements or characters in reverse\n     * order.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig [a] -> [a]\n     * @sig String -> String\n     * @param {Array|String} list\n     * @return {Array|String}\n     * @example\n     *\n     *      R.reverse([1, 2, 3]);  //=> [3, 2, 1]\n     *      R.reverse([1, 2]);     //=> [2, 1]\n     *      R.reverse([1]);        //=> [1]\n     *      R.reverse([]);         //=> []\n     *\n     *      R.reverse('abc');      //=> 'cba'\n     *      R.reverse('ab');       //=> 'ba'\n     *      R.reverse('a');        //=> 'a'\n     *      R.reverse('');         //=> ''\n     */\n    var reverse = _curry1(function reverse(list) {\n        return _isString(list) ? list.split('').reverse().join('') : _slice(list).reverse();\n    });\n\n    /**\n     * Scan is similar to reduce, but returns a list of successively reduced values\n     * from the left\n     *\n     * @func\n     * @memberOf R\n     * @since v0.10.0\n     * @category List\n     * @sig (a,b -> a) -> a -> [b] -> [a]\n     * @param {Function} fn The iterator function. Receives two values, the accumulator and the\n     *        current element from the array\n     * @param {*} acc The accumulator value.\n     * @param {Array} list The list to iterate over.\n     * @return {Array} A list of all intermediately reduced values.\n     * @example\n     *\n     *      var numbers = [1, 2, 3, 4];\n     *      var factorials = R.scan(R.multiply, 1, numbers); //=> [1, 1, 2, 6, 24]\n     */\n    var scan = _curry3(function scan(fn, acc, list) {\n        var idx = 0;\n        var len = list.length;\n        var result = [acc];\n        while (idx < len) {\n            acc = fn(acc, list[idx]);\n            result[idx + 1] = acc;\n            idx += 1;\n        }\n        return result;\n    });\n\n    /**\n     * Returns the result of \"setting\" the portion of the given data structure\n     * focused by the given lens to the given value.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.16.0\n     * @category Object\n     * @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s\n     * @sig Lens s a -> a -> s -> s\n     * @param {Lens} lens\n     * @param {*} v\n     * @param {*} x\n     * @return {*}\n     * @see R.prop, R.lensIndex, R.lensProp\n     * @example\n     *\n     *      var xLens = R.lensProp('x');\n     *\n     *      R.set(xLens, 4, {x: 1, y: 2});  //=> {x: 4, y: 2}\n     *      R.set(xLens, 8, {x: 1, y: 2});  //=> {x: 8, y: 2}\n     */\n    var set = _curry3(function set(lens, v, x) {\n        return over(lens, always(v), x);\n    });\n\n    /**\n     * Returns the elements of the given list or string (or object with a `slice`\n     * method) from `fromIndex` (inclusive) to `toIndex` (exclusive).\n     *\n     * Dispatches to the `slice` method of the third argument, if present.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.4\n     * @category List\n     * @sig Number -> Number -> [a] -> [a]\n     * @sig Number -> Number -> String -> String\n     * @param {Number} fromIndex The start index (inclusive).\n     * @param {Number} toIndex The end index (exclusive).\n     * @param {*} list\n     * @return {*}\n     * @example\n     *\n     *      R.slice(1, 3, ['a', 'b', 'c', 'd']);        //=> ['b', 'c']\n     *      R.slice(1, Infinity, ['a', 'b', 'c', 'd']); //=> ['b', 'c', 'd']\n     *      R.slice(0, -1, ['a', 'b', 'c', 'd']);       //=> ['a', 'b', 'c']\n     *      R.slice(-3, -1, ['a', 'b', 'c', 'd']);      //=> ['b', 'c']\n     *      R.slice(0, 3, 'ramda');                     //=> 'ram'\n     */\n    var slice = _curry3(_checkForMethod('slice', function slice(fromIndex, toIndex, list) {\n        return Array.prototype.slice.call(list, fromIndex, toIndex);\n    }));\n\n    /**\n     * Returns a copy of the list, sorted according to the comparator function,\n     * which should accept two values at a time and return a negative number if the\n     * first value is smaller, a positive number if it's larger, and zero if they\n     * are equal. Please note that this is a **copy** of the list. It does not\n     * modify the original.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig (a,a -> Number) -> [a] -> [a]\n     * @param {Function} comparator A sorting function :: a -> b -> Int\n     * @param {Array} list The list to sort\n     * @return {Array} a new array with its elements sorted by the comparator function.\n     * @example\n     *\n     *      var diff = function(a, b) { return a - b; };\n     *      R.sort(diff, [4,2,7,5]); //=> [2, 4, 5, 7]\n     */\n    var sort = _curry2(function sort(comparator, list) {\n        return _slice(list).sort(comparator);\n    });\n\n    /**\n     * Sorts the list according to the supplied function.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Relation\n     * @sig Ord b => (a -> b) -> [a] -> [a]\n     * @param {Function} fn\n     * @param {Array} list The list to sort.\n     * @return {Array} A new list sorted by the keys generated by `fn`.\n     * @example\n     *\n     *      var sortByFirstItem = R.sortBy(R.prop(0));\n     *      var sortByNameCaseInsensitive = R.sortBy(R.compose(R.toLower, R.prop('name')));\n     *      var pairs = [[-1, 1], [-2, 2], [-3, 3]];\n     *      sortByFirstItem(pairs); //=> [[-3, 3], [-2, 2], [-1, 1]]\n     *      var alice = {\n     *        name: 'ALICE',\n     *        age: 101\n     *      };\n     *      var bob = {\n     *        name: 'Bob',\n     *        age: -10\n     *      };\n     *      var clara = {\n     *        name: 'clara',\n     *        age: 314.159\n     *      };\n     *      var people = [clara, bob, alice];\n     *      sortByNameCaseInsensitive(people); //=> [alice, bob, clara]\n     */\n    var sortBy = _curry2(function sortBy(fn, list) {\n        return _slice(list).sort(function (a, b) {\n            var aa = fn(a);\n            var bb = fn(b);\n            return aa < bb ? -1 : aa > bb ? 1 : 0;\n        });\n    });\n\n    /**\n     * Splits a given list or string at a given index.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.19.0\n     * @category List\n     * @sig Number -> [a] -> [[a], [a]]\n     * @sig Number -> String -> [String, String]\n     * @param {Number} index The index where the array/string is split.\n     * @param {Array|String} array The array/string to be split.\n     * @return {Array}\n     * @example\n     *\n     *      R.splitAt(1, [1, 2, 3]);          //=> [[1], [2, 3]]\n     *      R.splitAt(5, 'hello world');      //=> ['hello', ' world']\n     *      R.splitAt(-1, 'foobar');          //=> ['fooba', 'r']\n     */\n    var splitAt = _curry2(function splitAt(index, array) {\n        return [\n            slice(0, index, array),\n            slice(index, length(array), array)\n        ];\n    });\n\n    /**\n     * Splits a collection into slices of the specified length.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.16.0\n     * @category List\n     * @sig Number -> [a] -> [[a]]\n     * @sig Number -> String -> [String]\n     * @param {Number} n\n     * @param {Array} list\n     * @return {Array}\n     * @example\n     *\n     *      R.splitEvery(3, [1, 2, 3, 4, 5, 6, 7]); //=> [[1, 2, 3], [4, 5, 6], [7]]\n     *      R.splitEvery(3, 'foobarbaz'); //=> ['foo', 'bar', 'baz']\n     */\n    var splitEvery = _curry2(function splitEvery(n, list) {\n        if (n <= 0) {\n            throw new Error('First argument to splitEvery must be a positive integer');\n        }\n        var result = [];\n        var idx = 0;\n        while (idx < list.length) {\n            result.push(slice(idx, idx += n, list));\n        }\n        return result;\n    });\n\n    /**\n     * Takes a list and a predicate and returns a pair of lists with the following properties:\n     *\n     *  - the result of concatenating the two output lists is equivalent to the input list;\n     *  - none of the elements of the first output list satisfies the predicate; and\n     *  - if the second output list is non-empty, its first element satisfies the predicate.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.19.0\n     * @category List\n     * @sig (a -> Boolean) -> [a] -> [[a], [a]]\n     * @param {Function} pred The predicate that determines where the array is split.\n     * @param {Array} list The array to be split.\n     * @return {Array}\n     * @example\n     *\n     *      R.splitWhen(R.equals(2), [1, 2, 3, 1, 2, 3]);   //=> [[1], [2, 3, 1, 2, 3]]\n     */\n    var splitWhen = _curry2(function splitWhen(pred, list) {\n        var idx = 0;\n        var len = list.length;\n        var prefix = [];\n        while (idx < len && !pred(list[idx])) {\n            prefix.push(list[idx]);\n            idx += 1;\n        }\n        return [\n            prefix,\n            _slice(list, idx)\n        ];\n    });\n\n    /**\n     * Subtracts its second argument from its first argument.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Math\n     * @sig Number -> Number -> Number\n     * @param {Number} a The first value.\n     * @param {Number} b The second value.\n     * @return {Number} The result of `a - b`.\n     * @see R.add\n     * @example\n     *\n     *      R.subtract(10, 8); //=> 2\n     *\n     *      var minus5 = R.subtract(R.__, 5);\n     *      minus5(17); //=> 12\n     *\n     *      var complementaryAngle = R.subtract(90);\n     *      complementaryAngle(30); //=> 60\n     *      complementaryAngle(72); //=> 18\n     */\n    var subtract = _curry2(function subtract(a, b) {\n        return Number(a) - Number(b);\n    });\n\n    /**\n     * Returns all but the first element of the given list or string (or object\n     * with a `tail` method).\n     *\n     * Dispatches to the `slice` method of the first argument, if present.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig [a] -> [a]\n     * @sig String -> String\n     * @param {*} list\n     * @return {*}\n     * @see R.head, R.init, R.last\n     * @example\n     *\n     *      R.tail([1, 2, 3]);  //=> [2, 3]\n     *      R.tail([1, 2]);     //=> [2]\n     *      R.tail([1]);        //=> []\n     *      R.tail([]);         //=> []\n     *\n     *      R.tail('abc');  //=> 'bc'\n     *      R.tail('ab');   //=> 'b'\n     *      R.tail('a');    //=> ''\n     *      R.tail('');     //=> ''\n     */\n    var tail = _checkForMethod('tail', slice(1, Infinity));\n\n    /**\n     * Returns the first `n` elements of the given list, string, or\n     * transducer/transformer (or object with a `take` method).\n     *\n     * Dispatches to the `take` method of the second argument, if present.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig Number -> [a] -> [a]\n     * @sig Number -> String -> String\n     * @param {Number} n\n     * @param {*} list\n     * @return {*}\n     * @see R.drop\n     * @example\n     *\n     *      R.take(1, ['foo', 'bar', 'baz']); //=> ['foo']\n     *      R.take(2, ['foo', 'bar', 'baz']); //=> ['foo', 'bar']\n     *      R.take(3, ['foo', 'bar', 'baz']); //=> ['foo', 'bar', 'baz']\n     *      R.take(4, ['foo', 'bar', 'baz']); //=> ['foo', 'bar', 'baz']\n     *      R.take(3, 'ramda');               //=> 'ram'\n     *\n     *      var personnel = [\n     *        'Dave Brubeck',\n     *        'Paul Desmond',\n     *        'Eugene Wright',\n     *        'Joe Morello',\n     *        'Gerry Mulligan',\n     *        'Bob Bates',\n     *        'Joe Dodge',\n     *        'Ron Crotty'\n     *      ];\n     *\n     *      var takeFive = R.take(5);\n     *      takeFive(personnel);\n     *      //=> ['Dave Brubeck', 'Paul Desmond', 'Eugene Wright', 'Joe Morello', 'Gerry Mulligan']\n     */\n    var take = _curry2(_dispatchable('take', _xtake, function take(n, xs) {\n        return slice(0, n < 0 ? Infinity : n, xs);\n    }));\n\n    /**\n     * Returns a new list containing the last `n` elements of a given list, passing\n     * each value to the supplied predicate function, and terminating when the\n     * predicate function returns `false`. Excludes the element that caused the\n     * predicate function to fail. The predicate function is passed one argument:\n     * *(value)*.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.16.0\n     * @category List\n     * @sig (a -> Boolean) -> [a] -> [a]\n     * @param {Function} fn The function called per iteration.\n     * @param {Array} list The collection to iterate over.\n     * @return {Array} A new array.\n     * @see R.dropLastWhile, R.addIndex\n     * @example\n     *\n     *      var isNotOne = x => x !== 1;\n     *\n     *      R.takeLastWhile(isNotOne, [1, 2, 3, 4]); //=> [2, 3, 4]\n     */\n    var takeLastWhile = _curry2(function takeLastWhile(fn, list) {\n        var idx = list.length - 1;\n        while (idx >= 0 && fn(list[idx])) {\n            idx -= 1;\n        }\n        return _slice(list, idx + 1, Infinity);\n    });\n\n    /**\n     * Returns a new list containing the first `n` elements of a given list,\n     * passing each value to the supplied predicate function, and terminating when\n     * the predicate function returns `false`. Excludes the element that caused the\n     * predicate function to fail. The predicate function is passed one argument:\n     * *(value)*.\n     *\n     * Dispatches to the `takeWhile` method of the second argument, if present.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig (a -> Boolean) -> [a] -> [a]\n     * @param {Function} fn The function called per iteration.\n     * @param {Array} list The collection to iterate over.\n     * @return {Array} A new array.\n     * @see R.dropWhile, R.transduce, R.addIndex\n     * @example\n     *\n     *      var isNotFour = x => x !== 4;\n     *\n     *      R.takeWhile(isNotFour, [1, 2, 3, 4, 3, 2, 1]); //=> [1, 2, 3]\n     */\n    var takeWhile = _curry2(_dispatchable('takeWhile', _xtakeWhile, function takeWhile(fn, list) {\n        var idx = 0;\n        var len = list.length;\n        while (idx < len && fn(list[idx])) {\n            idx += 1;\n        }\n        return _slice(list, 0, idx);\n    }));\n\n    /**\n     * Runs the given function with the supplied object, then returns the object.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Function\n     * @sig (a -> *) -> a -> a\n     * @param {Function} fn The function to call with `x`. The return value of `fn` will be thrown away.\n     * @param {*} x\n     * @return {*} `x`.\n     * @example\n     *\n     *      var sayX = x => console.log('x is ' + x);\n     *      R.tap(sayX, 100); //=> 100\n     *      // logs 'x is 100'\n     */\n    var tap = _curry2(function tap(fn, x) {\n        fn(x);\n        return x;\n    });\n\n    /**\n     * Calls an input function `n` times, returning an array containing the results\n     * of those function calls.\n     *\n     * `fn` is passed one argument: The current value of `n`, which begins at `0`\n     * and is gradually incremented to `n - 1`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.2.3\n     * @category List\n     * @sig (Number -> a) -> Number -> [a]\n     * @param {Function} fn The function to invoke. Passed one argument, the current value of `n`.\n     * @param {Number} n A value between `0` and `n - 1`. Increments after each function call.\n     * @return {Array} An array containing the return values of all calls to `fn`.\n     * @example\n     *\n     *      R.times(R.identity, 5); //=> [0, 1, 2, 3, 4]\n     */\n    var times = _curry2(function times(fn, n) {\n        var len = Number(n);\n        var idx = 0;\n        var list;\n        if (len < 0 || isNaN(len)) {\n            throw new RangeError('n must be a non-negative number');\n        }\n        list = new Array(len);\n        while (idx < len) {\n            list[idx] = fn(idx);\n            idx += 1;\n        }\n        return list;\n    });\n\n    /**\n     * Converts an object into an array of key, value arrays. Only the object's\n     * own properties are used.\n     * Note that the order of the output array is not guaranteed to be consistent\n     * across different JS platforms.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.4.0\n     * @category Object\n     * @sig {String: *} -> [[String,*]]\n     * @param {Object} obj The object to extract from\n     * @return {Array} An array of key, value arrays from the object's own properties.\n     * @see R.fromPairs\n     * @example\n     *\n     *      R.toPairs({a: 1, b: 2, c: 3}); //=> [['a', 1], ['b', 2], ['c', 3]]\n     */\n    var toPairs = _curry1(function toPairs(obj) {\n        var pairs = [];\n        for (var prop in obj) {\n            if (_has(prop, obj)) {\n                pairs[pairs.length] = [\n                    prop,\n                    obj[prop]\n                ];\n            }\n        }\n        return pairs;\n    });\n\n    /**\n     * Converts an object into an array of key, value arrays. The object's own\n     * properties and prototype properties are used. Note that the order of the\n     * output array is not guaranteed to be consistent across different JS\n     * platforms.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.4.0\n     * @category Object\n     * @sig {String: *} -> [[String,*]]\n     * @param {Object} obj The object to extract from\n     * @return {Array} An array of key, value arrays from the object's own\n     *         and prototype properties.\n     * @example\n     *\n     *      var F = function() { this.x = 'X'; };\n     *      F.prototype.y = 'Y';\n     *      var f = new F();\n     *      R.toPairsIn(f); //=> [['x','X'], ['y','Y']]\n     */\n    var toPairsIn = _curry1(function toPairsIn(obj) {\n        var pairs = [];\n        for (var prop in obj) {\n            pairs[pairs.length] = [\n                prop,\n                obj[prop]\n            ];\n        }\n        return pairs;\n    });\n\n    /**\n     * Transposes the rows and columns of a 2D list.\n     * When passed a list of `n` lists of length `x`,\n     * returns a list of `x` lists of length `n`.\n     *\n     *\n     * @func\n     * @memberOf R\n     * @since v0.19.0\n     * @category List\n     * @sig [[a]] -> [[a]]\n     * @param {Array} list A 2D list\n     * @return {Array} A 2D list\n     * @example\n     *\n     *      R.transpose([[1, 'a'], [2, 'b'], [3, 'c']]) //=> [[1, 2, 3], ['a', 'b', 'c']]\n     *      R.transpose([[1, 2, 3], ['a', 'b', 'c']]) //=> [[1, 'a'], [2, 'b'], [3, 'c']]\n     *\n     * If some of the rows are shorter than the following rows, their elements are skipped:\n     *\n     *      R.transpose([[10, 11], [20], [], [30, 31, 32]]) //=> [[10, 20, 30], [11, 31], [32]]\n     */\n    var transpose = _curry1(function transpose(outerlist) {\n        var i = 0;\n        var result = [];\n        while (i < outerlist.length) {\n            var innerlist = outerlist[i];\n            var j = 0;\n            while (j < innerlist.length) {\n                if (typeof result[j] === 'undefined') {\n                    result[j] = [];\n                }\n                result[j].push(innerlist[j]);\n                j += 1;\n            }\n            i += 1;\n        }\n        return result;\n    });\n\n    /**\n     * Removes (strips) whitespace from both ends of the string.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.6.0\n     * @category String\n     * @sig String -> String\n     * @param {String} str The string to trim.\n     * @return {String} Trimmed version of `str`.\n     * @example\n     *\n     *      R.trim('   xyz  '); //=> 'xyz'\n     *      R.map(R.trim, R.split(',', 'x, y, z')); //=> ['x', 'y', 'z']\n     */\n    var trim = function () {\n        var ws = '\\t\\n\\x0B\\f\\r \\xA0\\u1680\\u180E\\u2000\\u2001\\u2002\\u2003' + '\\u2004\\u2005\\u2006\\u2007\\u2008\\u2009\\u200A\\u202F\\u205F\\u3000\\u2028' + '\\u2029\\uFEFF';\n        var zeroWidth = '\\u200B';\n        var hasProtoTrim = typeof String.prototype.trim === 'function';\n        if (!hasProtoTrim || (ws.trim() || !zeroWidth.trim())) {\n            return _curry1(function trim(str) {\n                var beginRx = new RegExp('^[' + ws + '][' + ws + ']*');\n                var endRx = new RegExp('[' + ws + '][' + ws + ']*$');\n                return str.replace(beginRx, '').replace(endRx, '');\n            });\n        } else {\n            return _curry1(function trim(str) {\n                return str.trim();\n            });\n        }\n    }();\n\n    /**\n     * `tryCatch` takes two functions, a `tryer` and a `catcher`. The returned\n     * function evaluates the `tryer`; if it does not throw, it simply returns the\n     * result. If the `tryer` *does* throw, the returned function evaluates the\n     * `catcher` function and returns its result. Note that for effective\n     * composition with this function, both the `tryer` and `catcher` functions\n     * must return the same type of results.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.20.0\n     * @category Function\n     * @sig (...x -> a) -> ((e, ...x) -> a) -> (...x -> a)\n     * @param {Function} tryer The function that may throw.\n     * @param {Function} catcher The function that will be evaluated if `tryer` throws.\n     * @return {Function} A new function that will catch exceptions and send then to the catcher.\n     * @example\n     *\n     *      R.tryCatch(R.prop('x'), R.F)({x: true}); //=> true\n     *      R.tryCatch(R.prop('x'), R.F)(null);      //=> false\n     */\n    var tryCatch = _curry2(function _tryCatch(tryer, catcher) {\n        return _arity(tryer.length, function () {\n            try {\n                return tryer.apply(this, arguments);\n            } catch (e) {\n                return catcher.apply(this, _concat([e], arguments));\n            }\n        });\n    });\n\n    /**\n     * Gives a single-word string description of the (native) type of a value,\n     * returning such answers as 'Object', 'Number', 'Array', or 'Null'. Does not\n     * attempt to distinguish user Object types any further, reporting them all as\n     * 'Object'.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.8.0\n     * @category Type\n     * @sig (* -> {*}) -> String\n     * @param {*} val The value to test\n     * @return {String}\n     * @example\n     *\n     *      R.type({}); //=> \"Object\"\n     *      R.type(1); //=> \"Number\"\n     *      R.type(false); //=> \"Boolean\"\n     *      R.type('s'); //=> \"String\"\n     *      R.type(null); //=> \"Null\"\n     *      R.type([]); //=> \"Array\"\n     *      R.type(/[A-z]/); //=> \"RegExp\"\n     */\n    var type = _curry1(function type(val) {\n        return val === null ? 'Null' : val === undefined ? 'Undefined' : Object.prototype.toString.call(val).slice(8, -1);\n    });\n\n    /**\n     * Takes a function `fn`, which takes a single array argument, and returns a\n     * function which:\n     *\n     *   - takes any number of positional arguments;\n     *   - passes these arguments to `fn` as an array; and\n     *   - returns the result.\n     *\n     * In other words, R.unapply derives a variadic function from a function which\n     * takes an array. R.unapply is the inverse of R.apply.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.8.0\n     * @category Function\n     * @sig ([*...] -> a) -> (*... -> a)\n     * @param {Function} fn\n     * @return {Function}\n     * @see R.apply\n     * @example\n     *\n     *      R.unapply(JSON.stringify)(1, 2, 3); //=> '[1,2,3]'\n     */\n    var unapply = _curry1(function unapply(fn) {\n        return function () {\n            return fn(_slice(arguments));\n        };\n    });\n\n    /**\n     * Wraps a function of any arity (including nullary) in a function that accepts\n     * exactly 1 parameter. Any extraneous parameters will not be passed to the\n     * supplied function.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.2.0\n     * @category Function\n     * @sig (* -> b) -> (a -> b)\n     * @param {Function} fn The function to wrap.\n     * @return {Function} A new function wrapping `fn`. The new function is guaranteed to be of\n     *         arity 1.\n     * @example\n     *\n     *      var takesTwoArgs = function(a, b) {\n     *        return [a, b];\n     *      };\n     *      takesTwoArgs.length; //=> 2\n     *      takesTwoArgs(1, 2); //=> [1, 2]\n     *\n     *      var takesOneArg = R.unary(takesTwoArgs);\n     *      takesOneArg.length; //=> 1\n     *      // Only 1 argument is passed to the wrapped function\n     *      takesOneArg(1, 2); //=> [1, undefined]\n     */\n    var unary = _curry1(function unary(fn) {\n        return nAry(1, fn);\n    });\n\n    /**\n     * Returns a function of arity `n` from a (manually) curried function.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.14.0\n     * @category Function\n     * @sig Number -> (a -> b) -> (a -> c)\n     * @param {Number} length The arity for the returned function.\n     * @param {Function} fn The function to uncurry.\n     * @return {Function} A new function.\n     * @see R.curry\n     * @example\n     *\n     *      var addFour = a => b => c => d => a + b + c + d;\n     *\n     *      var uncurriedAddFour = R.uncurryN(4, addFour);\n     *      uncurriedAddFour(1, 2, 3, 4); //=> 10\n     */\n    var uncurryN = _curry2(function uncurryN(depth, fn) {\n        return curryN(depth, function () {\n            var currentDepth = 1;\n            var value = fn;\n            var idx = 0;\n            var endIdx;\n            while (currentDepth <= depth && typeof value === 'function') {\n                endIdx = currentDepth === depth ? arguments.length : idx + value.length;\n                value = value.apply(this, _slice(arguments, idx, endIdx));\n                currentDepth += 1;\n                idx = endIdx;\n            }\n            return value;\n        });\n    });\n\n    /**\n     * Builds a list from a seed value. Accepts an iterator function, which returns\n     * either false to stop iteration or an array of length 2 containing the value\n     * to add to the resulting list and the seed to be used in the next call to the\n     * iterator function.\n     *\n     * The iterator function receives one argument: *(seed)*.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.10.0\n     * @category List\n     * @sig (a -> [b]) -> * -> [b]\n     * @param {Function} fn The iterator function. receives one argument, `seed`, and returns\n     *        either false to quit iteration or an array of length two to proceed. The element\n     *        at index 0 of this array will be added to the resulting array, and the element\n     *        at index 1 will be passed to the next call to `fn`.\n     * @param {*} seed The seed value.\n     * @return {Array} The final list.\n     * @example\n     *\n     *      var f = n => n > 50 ? false : [-n, n + 10];\n     *      R.unfold(f, 10); //=> [-10, -20, -30, -40, -50]\n     */\n    var unfold = _curry2(function unfold(fn, seed) {\n        var pair = fn(seed);\n        var result = [];\n        while (pair && pair.length) {\n            result[result.length] = pair[0];\n            pair = fn(pair[1]);\n        }\n        return result;\n    });\n\n    /**\n     * Returns a new list containing only one copy of each element in the original\n     * list, based upon the value returned by applying the supplied predicate to\n     * two list elements. Prefers the first item if two items compare equal based\n     * on the predicate.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.2.0\n     * @category List\n     * @sig (a, a -> Boolean) -> [a] -> [a]\n     * @param {Function} pred A predicate used to test whether two items are equal.\n     * @param {Array} list The array to consider.\n     * @return {Array} The list of unique items.\n     * @example\n     *\n     *      var strEq = R.eqBy(String);\n     *      R.uniqWith(strEq)([1, '1', 2, 1]); //=> [1, 2]\n     *      R.uniqWith(strEq)([{}, {}]);       //=> [{}]\n     *      R.uniqWith(strEq)([1, '1', 1]);    //=> [1]\n     *      R.uniqWith(strEq)(['1', 1, 1]);    //=> ['1']\n     */\n    var uniqWith = _curry2(function uniqWith(pred, list) {\n        var idx = 0;\n        var len = list.length;\n        var result = [];\n        var item;\n        while (idx < len) {\n            item = list[idx];\n            if (!_containsWith(pred, item, result)) {\n                result[result.length] = item;\n            }\n            idx += 1;\n        }\n        return result;\n    });\n\n    /**\n     * Tests the final argument by passing it to the given predicate function. If\n     * the predicate is not satisfied, the function will return the result of\n     * calling the `whenFalseFn` function with the same argument. If the predicate\n     * is satisfied, the argument is returned as is.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.18.0\n     * @category Logic\n     * @sig (a -> Boolean) -> (a -> a) -> a -> a\n     * @param {Function} pred        A predicate function\n     * @param {Function} whenFalseFn A function to invoke when the `pred` evaluates\n     *                               to a falsy value.\n     * @param {*}        x           An object to test with the `pred` function and\n     *                               pass to `whenFalseFn` if necessary.\n     * @return {*} Either `x` or the result of applying `x` to `whenFalseFn`.\n     * @see R.ifElse, R.when\n     * @example\n     *\n     *      // coerceArray :: (a|[a]) -> [a]\n     *      var coerceArray = R.unless(R.isArrayLike, R.of);\n     *      coerceArray([1, 2, 3]); //=> [1, 2, 3]\n     *      coerceArray(1);         //=> [1]\n     */\n    var unless = _curry3(function unless(pred, whenFalseFn, x) {\n        return pred(x) ? x : whenFalseFn(x);\n    });\n\n    /**\n     * Takes a predicate, a transformation function, and an initial value,\n     * and returns a value of the same type as the initial value.\n     * It does so by applying the transformation until the predicate is satisfied,\n     * at which point it returns the satisfactory value.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.20.0\n     * @category Logic\n     * @sig (a -> Boolean) -> (a -> a) -> a -> a\n     * @param {Function} pred A predicate function\n     * @param {Function} fn The iterator function\n     * @param {*} init Initial value\n     * @return {*} Final value that satisfies predicate\n     * @example\n     *\n     *      R.until(R.gt(R.__, 100), R.multiply(2))(1) // => 128\n     */\n    var until = _curry3(function until(pred, fn, init) {\n        var val = init;\n        while (!pred(val)) {\n            val = fn(val);\n        }\n        return val;\n    });\n\n    /**\n     * Returns a new copy of the array with the element at the provided index\n     * replaced with the given value.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.14.0\n     * @category List\n     * @sig Number -> a -> [a] -> [a]\n     * @param {Number} idx The index to update.\n     * @param {*} x The value to exist at the given index of the returned array.\n     * @param {Array|Arguments} list The source array-like object to be updated.\n     * @return {Array} A copy of `list` with the value at index `idx` replaced with `x`.\n     * @see R.adjust\n     * @example\n     *\n     *      R.update(1, 11, [0, 1, 2]);     //=> [0, 11, 2]\n     *      R.update(1)(11)([0, 1, 2]);     //=> [0, 11, 2]\n     */\n    var update = _curry3(function update(idx, x, list) {\n        return adjust(always(x), idx, list);\n    });\n\n    /**\n     * Accepts a function `fn` and a list of transformer functions and returns a\n     * new curried function. When the new function is invoked, it calls the\n     * function `fn` with parameters consisting of the result of calling each\n     * supplied handler on successive arguments to the new function.\n     *\n     * If more arguments are passed to the returned function than transformer\n     * functions, those arguments are passed directly to `fn` as additional\n     * parameters. If you expect additional arguments that don't need to be\n     * transformed, although you can ignore them, it's best to pass an identity\n     * function so that the new function reports the correct arity.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Function\n     * @sig (x1 -> x2 -> ... -> z) -> [(a -> x1), (b -> x2), ...] -> (a -> b -> ... -> z)\n     * @param {Function} fn The function to wrap.\n     * @param {Array} transformers A list of transformer functions\n     * @return {Function} The wrapped function.\n     * @example\n     *\n     *      R.useWith(Math.pow, [R.identity, R.identity])(3, 4); //=> 81\n     *      R.useWith(Math.pow, [R.identity, R.identity])(3)(4); //=> 81\n     *      R.useWith(Math.pow, [R.dec, R.inc])(3, 4); //=> 32\n     *      R.useWith(Math.pow, [R.dec, R.inc])(3)(4); //=> 32\n     */\n    var useWith = _curry2(function useWith(fn, transformers) {\n        return curryN(transformers.length, function () {\n            var args = [];\n            var idx = 0;\n            while (idx < transformers.length) {\n                args.push(transformers[idx].call(this, arguments[idx]));\n                idx += 1;\n            }\n            return fn.apply(this, args.concat(_slice(arguments, transformers.length)));\n        });\n    });\n\n    /**\n     * Returns a list of all the enumerable own properties of the supplied object.\n     * Note that the order of the output array is not guaranteed across different\n     * JS platforms.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Object\n     * @sig {k: v} -> [v]\n     * @param {Object} obj The object to extract values from\n     * @return {Array} An array of the values of the object's own properties.\n     * @example\n     *\n     *      R.values({a: 1, b: 2, c: 3}); //=> [1, 2, 3]\n     */\n    var values = _curry1(function values(obj) {\n        var props = keys(obj);\n        var len = props.length;\n        var vals = [];\n        var idx = 0;\n        while (idx < len) {\n            vals[idx] = obj[props[idx]];\n            idx += 1;\n        }\n        return vals;\n    });\n\n    /**\n     * Returns a list of all the properties, including prototype properties, of the\n     * supplied object.\n     * Note that the order of the output array is not guaranteed to be consistent\n     * across different JS platforms.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.2.0\n     * @category Object\n     * @sig {k: v} -> [v]\n     * @param {Object} obj The object to extract values from\n     * @return {Array} An array of the values of the object's own and prototype properties.\n     * @example\n     *\n     *      var F = function() { this.x = 'X'; };\n     *      F.prototype.y = 'Y';\n     *      var f = new F();\n     *      R.valuesIn(f); //=> ['X', 'Y']\n     */\n    var valuesIn = _curry1(function valuesIn(obj) {\n        var prop;\n        var vs = [];\n        for (prop in obj) {\n            vs[vs.length] = obj[prop];\n        }\n        return vs;\n    });\n\n    /**\n     * Returns a \"view\" of the given data structure, determined by the given lens.\n     * The lens's focus determines which portion of the data structure is visible.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.16.0\n     * @category Object\n     * @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s\n     * @sig Lens s a -> s -> a\n     * @param {Lens} lens\n     * @param {*} x\n     * @return {*}\n     * @see R.prop, R.lensIndex, R.lensProp\n     * @example\n     *\n     *      var xLens = R.lensProp('x');\n     *\n     *      R.view(xLens, {x: 1, y: 2});  //=> 1\n     *      R.view(xLens, {x: 4, y: 2});  //=> 4\n     */\n    // `Const` is a functor that effectively ignores the function given to `map`.\n    // Using `Const` effectively ignores the setter function of the `lens`,\n    // leaving the value returned by the getter function unmodified.\n    var view = function () {\n        // `Const` is a functor that effectively ignores the function given to `map`.\n        var Const = function (x) {\n            return {\n                value: x,\n                map: function () {\n                    return this;\n                }\n            };\n        };\n        return _curry2(function view(lens, x) {\n            // Using `Const` effectively ignores the setter function of the `lens`,\n            // leaving the value returned by the getter function unmodified.\n            return lens(Const)(x).value;\n        });\n    }();\n\n    /**\n     * Tests the final argument by passing it to the given predicate function. If\n     * the predicate is satisfied, the function will return the result of calling\n     * the `whenTrueFn` function with the same argument. If the predicate is not\n     * satisfied, the argument is returned as is.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.18.0\n     * @category Logic\n     * @sig (a -> Boolean) -> (a -> a) -> a -> a\n     * @param {Function} pred       A predicate function\n     * @param {Function} whenTrueFn A function to invoke when the `condition`\n     *                              evaluates to a truthy value.\n     * @param {*}        x          An object to test with the `pred` function and\n     *                              pass to `whenTrueFn` if necessary.\n     * @return {*} Either `x` or the result of applying `x` to `whenTrueFn`.\n     * @see R.ifElse, R.unless\n     * @example\n     *\n     *      // truncate :: String -> String\n     *      var truncate = R.when(\n     *        R.propSatisfies(R.gt(R.__, 10), 'length'),\n     *        R.pipe(R.take(10), R.append('…'), R.join(''))\n     *      );\n     *      truncate('12345');         //=> '12345'\n     *      truncate('0123456789ABC'); //=> '0123456789…'\n     */\n    var when = _curry3(function when(pred, whenTrueFn, x) {\n        return pred(x) ? whenTrueFn(x) : x;\n    });\n\n    /**\n     * Takes a spec object and a test object; returns true if the test satisfies\n     * the spec. Each of the spec's own properties must be a predicate function.\n     * Each predicate is applied to the value of the corresponding property of the\n     * test object. `where` returns true if all the predicates return true, false\n     * otherwise.\n     *\n     * `where` is well suited to declaratively expressing constraints for other\n     * functions such as `filter` and `find`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.1\n     * @category Object\n     * @sig {String: (* -> Boolean)} -> {String: *} -> Boolean\n     * @param {Object} spec\n     * @param {Object} testObj\n     * @return {Boolean}\n     * @example\n     *\n     *      // pred :: Object -> Boolean\n     *      var pred = where({\n     *        a: equals('foo'),\n     *        b: complement(equals('bar')),\n     *        x: gt(__, 10),\n     *        y: lt(__, 20)\n     *      });\n     *\n     *      pred({a: 'foo', b: 'xxx', x: 11, y: 19}); //=> true\n     *      pred({a: 'xxx', b: 'xxx', x: 11, y: 19}); //=> false\n     *      pred({a: 'foo', b: 'bar', x: 11, y: 19}); //=> false\n     *      pred({a: 'foo', b: 'xxx', x: 10, y: 19}); //=> false\n     *      pred({a: 'foo', b: 'xxx', x: 11, y: 20}); //=> false\n     */\n    var where = _curry2(function where(spec, testObj) {\n        for (var prop in spec) {\n            if (_has(prop, spec) && !spec[prop](testObj[prop])) {\n                return false;\n            }\n        }\n        return true;\n    });\n\n    /**\n     * Wrap a function inside another to allow you to make adjustments to the\n     * parameters, or do other processing either before the internal function is\n     * called or with its results.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Function\n     * @sig (a... -> b) -> ((a... -> b) -> a... -> c) -> (a... -> c)\n     * @param {Function} fn The function to wrap.\n     * @param {Function} wrapper The wrapper function.\n     * @return {Function} The wrapped function.\n     * @deprecated since v0.22.0\n     * @example\n     *\n     *      var greet = name => 'Hello ' + name;\n     *\n     *      var shoutedGreet = R.wrap(greet, (gr, name) => gr(name).toUpperCase());\n     *\n     *      shoutedGreet(\"Kathy\"); //=> \"HELLO KATHY\"\n     *\n     *      var shortenedGreet = R.wrap(greet, function(gr, name) {\n     *        return gr(name.substring(0, 3));\n     *      });\n     *      shortenedGreet(\"Robert\"); //=> \"Hello Rob\"\n     */\n    var wrap = _curry2(function wrap(fn, wrapper) {\n        return curryN(fn.length, function () {\n            return wrapper.apply(this, _concat([fn], arguments));\n        });\n    });\n\n    /**\n     * Creates a new list out of the two supplied by creating each possible pair\n     * from the lists.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig [a] -> [b] -> [[a,b]]\n     * @param {Array} as The first list.\n     * @param {Array} bs The second list.\n     * @return {Array} The list made by combining each possible pair from\n     *         `as` and `bs` into pairs (`[a, b]`).\n     * @example\n     *\n     *      R.xprod([1, 2], ['a', 'b']); //=> [[1, 'a'], [1, 'b'], [2, 'a'], [2, 'b']]\n     */\n    // = xprodWith(prepend); (takes about 3 times as long...)\n    var xprod = _curry2(function xprod(a, b) {\n        // = xprodWith(prepend); (takes about 3 times as long...)\n        var idx = 0;\n        var ilen = a.length;\n        var j;\n        var jlen = b.length;\n        var result = [];\n        while (idx < ilen) {\n            j = 0;\n            while (j < jlen) {\n                result[result.length] = [\n                    a[idx],\n                    b[j]\n                ];\n                j += 1;\n            }\n            idx += 1;\n        }\n        return result;\n    });\n\n    /**\n     * Creates a new list out of the two supplied by pairing up equally-positioned\n     * items from both lists. The returned list is truncated to the length of the\n     * shorter of the two input lists.\n     * Note: `zip` is equivalent to `zipWith(function(a, b) { return [a, b] })`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig [a] -> [b] -> [[a,b]]\n     * @param {Array} list1 The first array to consider.\n     * @param {Array} list2 The second array to consider.\n     * @return {Array} The list made by pairing up same-indexed elements of `list1` and `list2`.\n     * @example\n     *\n     *      R.zip([1, 2, 3], ['a', 'b', 'c']); //=> [[1, 'a'], [2, 'b'], [3, 'c']]\n     */\n    var zip = _curry2(function zip(a, b) {\n        var rv = [];\n        var idx = 0;\n        var len = Math.min(a.length, b.length);\n        while (idx < len) {\n            rv[idx] = [\n                a[idx],\n                b[idx]\n            ];\n            idx += 1;\n        }\n        return rv;\n    });\n\n    /**\n     * Creates a new object out of a list of keys and a list of values.\n     * Key/value pairing is truncated to the length of the shorter of the two lists.\n     * Note: `zipObj` is equivalent to `pipe(zipWith(pair), fromPairs)`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.3.0\n     * @category List\n     * @sig [String] -> [*] -> {String: *}\n     * @param {Array} keys The array that will be properties on the output object.\n     * @param {Array} values The list of values on the output object.\n     * @return {Object} The object made by pairing up same-indexed elements of `keys` and `values`.\n     * @example\n     *\n     *      R.zipObj(['a', 'b', 'c'], [1, 2, 3]); //=> {a: 1, b: 2, c: 3}\n     */\n    var zipObj = _curry2(function zipObj(keys, values) {\n        var idx = 0;\n        var len = Math.min(keys.length, values.length);\n        var out = {};\n        while (idx < len) {\n            out[keys[idx]] = values[idx];\n            idx += 1;\n        }\n        return out;\n    });\n\n    /**\n     * Creates a new list out of the two supplied by applying the function to each\n     * equally-positioned pair in the lists. The returned list is truncated to the\n     * length of the shorter of the two input lists.\n     *\n     * @function\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig (a,b -> c) -> [a] -> [b] -> [c]\n     * @param {Function} fn The function used to combine the two elements into one value.\n     * @param {Array} list1 The first array to consider.\n     * @param {Array} list2 The second array to consider.\n     * @return {Array} The list made by combining same-indexed elements of `list1` and `list2`\n     *         using `fn`.\n     * @example\n     *\n     *      var f = (x, y) => {\n     *        // ...\n     *      };\n     *      R.zipWith(f, [1, 2, 3], ['a', 'b', 'c']);\n     *      //=> [f(1, 'a'), f(2, 'b'), f(3, 'c')]\n     */\n    var zipWith = _curry3(function zipWith(fn, a, b) {\n        var rv = [];\n        var idx = 0;\n        var len = Math.min(a.length, b.length);\n        while (idx < len) {\n            rv[idx] = fn(a[idx], b[idx]);\n            idx += 1;\n        }\n        return rv;\n    });\n\n    /**\n     * A function that always returns `false`. Any passed in parameters are ignored.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category Function\n     * @sig * -> Boolean\n     * @param {*}\n     * @return {Boolean}\n     * @see R.always, R.T\n     * @example\n     *\n     *      R.F(); //=> false\n     */\n    var F = always(false);\n\n    /**\n     * A function that always returns `true`. Any passed in parameters are ignored.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category Function\n     * @sig * -> Boolean\n     * @param {*}\n     * @return {Boolean}\n     * @see R.always, R.F\n     * @example\n     *\n     *      R.T(); //=> true\n     */\n    var T = always(true);\n\n    /**\n     * Copies an object.\n     *\n     * @private\n     * @param {*} value The value to be copied\n     * @param {Array} refFrom Array containing the source references\n     * @param {Array} refTo Array containing the copied source references\n     * @param {Boolean} deep Whether or not to perform deep cloning.\n     * @return {*} The copied value.\n     */\n    var _clone = function _clone(value, refFrom, refTo, deep) {\n        var copy = function copy(copiedValue) {\n            var len = refFrom.length;\n            var idx = 0;\n            while (idx < len) {\n                if (value === refFrom[idx]) {\n                    return refTo[idx];\n                }\n                idx += 1;\n            }\n            refFrom[idx + 1] = value;\n            refTo[idx + 1] = copiedValue;\n            for (var key in value) {\n                copiedValue[key] = deep ? _clone(value[key], refFrom, refTo, true) : value[key];\n            }\n            return copiedValue;\n        };\n        switch (type(value)) {\n        case 'Object':\n            return copy({});\n        case 'Array':\n            return copy([]);\n        case 'Date':\n            return new Date(value.valueOf());\n        case 'RegExp':\n            return _cloneRegExp(value);\n        default:\n            return value;\n        }\n    };\n\n    var _createPartialApplicator = function _createPartialApplicator(concat) {\n        return _curry2(function (fn, args) {\n            return _arity(Math.max(0, fn.length - args.length), function () {\n                return fn.apply(this, concat(args, arguments));\n            });\n        });\n    };\n\n    var _dropLast = function dropLast(n, xs) {\n        return take(n < xs.length ? xs.length - n : 0, xs);\n    };\n\n    // Values of other types are only equal if identical.\n    var _equals = function _equals(a, b, stackA, stackB) {\n        if (identical(a, b)) {\n            return true;\n        }\n        if (type(a) !== type(b)) {\n            return false;\n        }\n        if (a == null || b == null) {\n            return false;\n        }\n        if (typeof a.equals === 'function' || typeof b.equals === 'function') {\n            return typeof a.equals === 'function' && a.equals(b) && typeof b.equals === 'function' && b.equals(a);\n        }\n        switch (type(a)) {\n        case 'Arguments':\n        case 'Array':\n        case 'Object':\n            if (typeof a.constructor === 'function' && _functionName(a.constructor) === 'Promise') {\n                return a === b;\n            }\n            break;\n        case 'Boolean':\n        case 'Number':\n        case 'String':\n            if (!(typeof a === typeof b && identical(a.valueOf(), b.valueOf()))) {\n                return false;\n            }\n            break;\n        case 'Date':\n            if (!identical(a.valueOf(), b.valueOf())) {\n                return false;\n            }\n            break;\n        case 'Error':\n            return a.name === b.name && a.message === b.message;\n        case 'RegExp':\n            if (!(a.source === b.source && a.global === b.global && a.ignoreCase === b.ignoreCase && a.multiline === b.multiline && a.sticky === b.sticky && a.unicode === b.unicode)) {\n                return false;\n            }\n            break;\n        case 'Map':\n        case 'Set':\n            if (!_equals(_arrayFromIterator(a.entries()), _arrayFromIterator(b.entries()), stackA, stackB)) {\n                return false;\n            }\n            break;\n        case 'Int8Array':\n        case 'Uint8Array':\n        case 'Uint8ClampedArray':\n        case 'Int16Array':\n        case 'Uint16Array':\n        case 'Int32Array':\n        case 'Uint32Array':\n        case 'Float32Array':\n        case 'Float64Array':\n            break;\n        case 'ArrayBuffer':\n            break;\n        default:\n            // Values of other types are only equal if identical.\n            return false;\n        }\n        var keysA = keys(a);\n        if (keysA.length !== keys(b).length) {\n            return false;\n        }\n        var idx = stackA.length - 1;\n        while (idx >= 0) {\n            if (stackA[idx] === a) {\n                return stackB[idx] === b;\n            }\n            idx -= 1;\n        }\n        stackA.push(a);\n        stackB.push(b);\n        idx = keysA.length - 1;\n        while (idx >= 0) {\n            var key = keysA[idx];\n            if (!(_has(key, b) && _equals(b[key], a[key], stackA, stackB))) {\n                return false;\n            }\n            idx -= 1;\n        }\n        stackA.pop();\n        stackB.pop();\n        return true;\n    };\n\n    /**\n     * `_makeFlat` is a helper function that returns a one-level or fully recursive\n     * function based on the flag passed in.\n     *\n     * @private\n     */\n    var _makeFlat = function _makeFlat(recursive) {\n        return function flatt(list) {\n            var value, jlen, j;\n            var result = [];\n            var idx = 0;\n            var ilen = list.length;\n            while (idx < ilen) {\n                if (isArrayLike(list[idx])) {\n                    value = recursive ? flatt(list[idx]) : list[idx];\n                    j = 0;\n                    jlen = value.length;\n                    while (j < jlen) {\n                        result[result.length] = value[j];\n                        j += 1;\n                    }\n                } else {\n                    result[result.length] = list[idx];\n                }\n                idx += 1;\n            }\n            return result;\n        };\n    };\n\n    var _reduce = function () {\n        function _arrayReduce(xf, acc, list) {\n            var idx = 0;\n            var len = list.length;\n            while (idx < len) {\n                acc = xf['@@transducer/step'](acc, list[idx]);\n                if (acc && acc['@@transducer/reduced']) {\n                    acc = acc['@@transducer/value'];\n                    break;\n                }\n                idx += 1;\n            }\n            return xf['@@transducer/result'](acc);\n        }\n        function _iterableReduce(xf, acc, iter) {\n            var step = iter.next();\n            while (!step.done) {\n                acc = xf['@@transducer/step'](acc, step.value);\n                if (acc && acc['@@transducer/reduced']) {\n                    acc = acc['@@transducer/value'];\n                    break;\n                }\n                step = iter.next();\n            }\n            return xf['@@transducer/result'](acc);\n        }\n        function _methodReduce(xf, acc, obj) {\n            return xf['@@transducer/result'](obj.reduce(bind(xf['@@transducer/step'], xf), acc));\n        }\n        var symIterator = typeof Symbol !== 'undefined' ? Symbol.iterator : '@@iterator';\n        return function _reduce(fn, acc, list) {\n            if (typeof fn === 'function') {\n                fn = _xwrap(fn);\n            }\n            if (isArrayLike(list)) {\n                return _arrayReduce(fn, acc, list);\n            }\n            if (typeof list.reduce === 'function') {\n                return _methodReduce(fn, acc, list);\n            }\n            if (list[symIterator] != null) {\n                return _iterableReduce(fn, acc, list[symIterator]());\n            }\n            if (typeof list.next === 'function') {\n                return _iterableReduce(fn, acc, list);\n            }\n            throw new TypeError('reduce: list must be array or iterable');\n        };\n    }();\n\n    var _stepCat = function () {\n        var _stepCatArray = {\n            '@@transducer/init': Array,\n            '@@transducer/step': function (xs, x) {\n                xs.push(x);\n                return xs;\n            },\n            '@@transducer/result': _identity\n        };\n        var _stepCatString = {\n            '@@transducer/init': String,\n            '@@transducer/step': function (a, b) {\n                return a + b;\n            },\n            '@@transducer/result': _identity\n        };\n        var _stepCatObject = {\n            '@@transducer/init': Object,\n            '@@transducer/step': function (result, input) {\n                return _assign(result, isArrayLike(input) ? objOf(input[0], input[1]) : input);\n            },\n            '@@transducer/result': _identity\n        };\n        return function _stepCat(obj) {\n            if (_isTransformer(obj)) {\n                return obj;\n            }\n            if (isArrayLike(obj)) {\n                return _stepCatArray;\n            }\n            if (typeof obj === 'string') {\n                return _stepCatString;\n            }\n            if (typeof obj === 'object') {\n                return _stepCatObject;\n            }\n            throw new Error('Cannot create transformer for ' + obj);\n        };\n    }();\n\n    var _xdropLastWhile = function () {\n        function XDropLastWhile(fn, xf) {\n            this.f = fn;\n            this.retained = [];\n            this.xf = xf;\n        }\n        XDropLastWhile.prototype['@@transducer/init'] = _xfBase.init;\n        XDropLastWhile.prototype['@@transducer/result'] = function (result) {\n            this.retained = null;\n            return this.xf['@@transducer/result'](result);\n        };\n        XDropLastWhile.prototype['@@transducer/step'] = function (result, input) {\n            return this.f(input) ? this.retain(result, input) : this.flush(result, input);\n        };\n        XDropLastWhile.prototype.flush = function (result, input) {\n            result = _reduce(this.xf['@@transducer/step'], result, this.retained);\n            this.retained = [];\n            return this.xf['@@transducer/step'](result, input);\n        };\n        XDropLastWhile.prototype.retain = function (result, input) {\n            this.retained.push(input);\n            return result;\n        };\n        return _curry2(function _xdropLastWhile(fn, xf) {\n            return new XDropLastWhile(fn, xf);\n        });\n    }();\n\n    /**\n     * Creates a new list iteration function from an existing one by adding two new\n     * parameters to its callback function: the current index, and the entire list.\n     *\n     * This would turn, for instance, Ramda's simple `map` function into one that\n     * more closely resembles `Array.prototype.map`. Note that this will only work\n     * for functions in which the iteration callback function is the first\n     * parameter, and where the list is the last parameter. (This latter might be\n     * unimportant if the list parameter is not used.)\n     *\n     * @func\n     * @memberOf R\n     * @since v0.15.0\n     * @category Function\n     * @category List\n     * @sig ((a ... -> b) ... -> [a] -> *) -> (a ..., Int, [a] -> b) ... -> [a] -> *)\n     * @param {Function} fn A list iteration function that does not pass index or list to its callback\n     * @return {Function} An altered list iteration function that passes (item, index, list) to its callback\n     * @example\n     *\n     *      var mapIndexed = R.addIndex(R.map);\n     *      mapIndexed((val, idx) => idx + '-' + val, ['f', 'o', 'o', 'b', 'a', 'r']);\n     *      //=> ['0-f', '1-o', '2-o', '3-b', '4-a', '5-r']\n     */\n    var addIndex = _curry1(function addIndex(fn) {\n        return curryN(fn.length, function () {\n            var idx = 0;\n            var origFn = arguments[0];\n            var list = arguments[arguments.length - 1];\n            var args = _slice(arguments);\n            args[0] = function () {\n                var result = origFn.apply(this, _concat(arguments, [\n                    idx,\n                    list\n                ]));\n                idx += 1;\n                return result;\n            };\n            return fn.apply(this, args);\n        });\n    });\n\n    /**\n     * Wraps a function of any arity (including nullary) in a function that accepts\n     * exactly 2 parameters. Any extraneous parameters will not be passed to the\n     * supplied function.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.2.0\n     * @category Function\n     * @sig (* -> c) -> (a, b -> c)\n     * @param {Function} fn The function to wrap.\n     * @return {Function} A new function wrapping `fn`. The new function is guaranteed to be of\n     *         arity 2.\n     * @example\n     *\n     *      var takesThreeArgs = function(a, b, c) {\n     *        return [a, b, c];\n     *      };\n     *      takesThreeArgs.length; //=> 3\n     *      takesThreeArgs(1, 2, 3); //=> [1, 2, 3]\n     *\n     *      var takesTwoArgs = R.binary(takesThreeArgs);\n     *      takesTwoArgs.length; //=> 2\n     *      // Only 2 arguments are passed to the wrapped function\n     *      takesTwoArgs(1, 2, 3); //=> [1, 2, undefined]\n     */\n    var binary = _curry1(function binary(fn) {\n        return nAry(2, fn);\n    });\n\n    /**\n     * Creates a deep copy of the value which may contain (nested) `Array`s and\n     * `Object`s, `Number`s, `String`s, `Boolean`s and `Date`s. `Function`s are not\n     * copied, but assigned by their reference.\n     *\n     * Dispatches to a `clone` method if present.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Object\n     * @sig {*} -> {*}\n     * @param {*} value The object or array to clone\n     * @return {*} A new object or array.\n     * @example\n     *\n     *      var objects = [{}, {}, {}];\n     *      var objectsClone = R.clone(objects);\n     *      objects[0] === objectsClone[0]; //=> false\n     */\n    var clone = _curry1(function clone(value) {\n        return value != null && typeof value.clone === 'function' ? value.clone() : _clone(value, [], [], true);\n    });\n\n    /**\n     * Returns a curried equivalent of the provided function. The curried function\n     * has two unusual capabilities. First, its arguments needn't be provided one\n     * at a time. If `f` is a ternary function and `g` is `R.curry(f)`, the\n     * following are equivalent:\n     *\n     *   - `g(1)(2)(3)`\n     *   - `g(1)(2, 3)`\n     *   - `g(1, 2)(3)`\n     *   - `g(1, 2, 3)`\n     *\n     * Secondly, the special placeholder value `R.__` may be used to specify\n     * \"gaps\", allowing partial application of any combination of arguments,\n     * regardless of their positions. If `g` is as above and `_` is `R.__`, the\n     * following are equivalent:\n     *\n     *   - `g(1, 2, 3)`\n     *   - `g(_, 2, 3)(1)`\n     *   - `g(_, _, 3)(1)(2)`\n     *   - `g(_, _, 3)(1, 2)`\n     *   - `g(_, 2)(1)(3)`\n     *   - `g(_, 2)(1, 3)`\n     *   - `g(_, 2)(_, 3)(1)`\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Function\n     * @sig (* -> a) -> (* -> a)\n     * @param {Function} fn The function to curry.\n     * @return {Function} A new, curried function.\n     * @see R.curryN\n     * @example\n     *\n     *      var addFourNumbers = (a, b, c, d) => a + b + c + d;\n     *\n     *      var curriedAddFourNumbers = R.curry(addFourNumbers);\n     *      var f = curriedAddFourNumbers(1, 2);\n     *      var g = f(3);\n     *      g(4); //=> 10\n     */\n    var curry = _curry1(function curry(fn) {\n        return curryN(fn.length, fn);\n    });\n\n    /**\n     * Returns all but the first `n` elements of the given list, string, or\n     * transducer/transformer (or object with a `drop` method).\n     *\n     * Dispatches to the `drop` method of the second argument, if present.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig Number -> [a] -> [a]\n     * @sig Number -> String -> String\n     * @param {Number} n\n     * @param {*} list\n     * @return {*}\n     * @see R.take, R.transduce\n     * @example\n     *\n     *      R.drop(1, ['foo', 'bar', 'baz']); //=> ['bar', 'baz']\n     *      R.drop(2, ['foo', 'bar', 'baz']); //=> ['baz']\n     *      R.drop(3, ['foo', 'bar', 'baz']); //=> []\n     *      R.drop(4, ['foo', 'bar', 'baz']); //=> []\n     *      R.drop(3, 'ramda');               //=> 'da'\n     */\n    var drop = _curry2(_dispatchable('drop', _xdrop, function drop(n, xs) {\n        return slice(Math.max(0, n), Infinity, xs);\n    }));\n\n    /**\n     * Returns a list containing all but the last `n` elements of the given `list`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.16.0\n     * @category List\n     * @sig Number -> [a] -> [a]\n     * @sig Number -> String -> String\n     * @param {Number} n The number of elements of `xs` to skip.\n     * @param {Array} xs The collection to consider.\n     * @return {Array}\n     * @see R.takeLast\n     * @example\n     *\n     *      R.dropLast(1, ['foo', 'bar', 'baz']); //=> ['foo', 'bar']\n     *      R.dropLast(2, ['foo', 'bar', 'baz']); //=> ['foo']\n     *      R.dropLast(3, ['foo', 'bar', 'baz']); //=> []\n     *      R.dropLast(4, ['foo', 'bar', 'baz']); //=> []\n     *      R.dropLast(3, 'ramda');               //=> 'ra'\n     */\n    var dropLast = _curry2(_dispatchable('dropLast', _xdropLast, _dropLast));\n\n    /**\n     * Returns a new list excluding all the tailing elements of a given list which\n     * satisfy the supplied predicate function. It passes each value from the right\n     * to the supplied predicate function, skipping elements while the predicate\n     * function returns `true`. The predicate function is applied to one argument:\n     * *(value)*.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.16.0\n     * @category List\n     * @sig (a -> Boolean) -> [a] -> [a]\n     * @param {Function} fn The function called per iteration.\n     * @param {Array} list The collection to iterate over.\n     * @return {Array} A new array.\n     * @see R.takeLastWhile, R.addIndex\n     * @example\n     *\n     *      var lteThree = x => x <= 3;\n     *\n     *      R.dropLastWhile(lteThree, [1, 2, 3, 4, 3, 2, 1]); //=> [1, 2, 3, 4]\n     */\n    var dropLastWhile = _curry2(_dispatchable('dropLastWhile', _xdropLastWhile, _dropLastWhile));\n\n    /**\n     * Returns `true` if its arguments are equivalent, `false` otherwise. Handles\n     * cyclical data structures.\n     *\n     * Dispatches symmetrically to the `equals` methods of both arguments, if\n     * present.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.15.0\n     * @category Relation\n     * @sig a -> b -> Boolean\n     * @param {*} a\n     * @param {*} b\n     * @return {Boolean}\n     * @example\n     *\n     *      R.equals(1, 1); //=> true\n     *      R.equals(1, '1'); //=> false\n     *      R.equals([1, 2, 3], [1, 2, 3]); //=> true\n     *\n     *      var a = {}; a.v = a;\n     *      var b = {}; b.v = b;\n     *      R.equals(a, b); //=> true\n     */\n    var equals = _curry2(function equals(a, b) {\n        return _equals(a, b, [], []);\n    });\n\n    /**\n     * Takes a predicate and a \"filterable\", and returns a new filterable of the\n     * same type containing the members of the given filterable which satisfy the\n     * given predicate.\n     *\n     * Dispatches to the `filter` method of the second argument, if present.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig Filterable f => (a -> Boolean) -> f a -> f a\n     * @param {Function} pred\n     * @param {Array} filterable\n     * @return {Array}\n     * @see R.reject, R.transduce, R.addIndex\n     * @example\n     *\n     *      var isEven = n => n % 2 === 0;\n     *\n     *      R.filter(isEven, [1, 2, 3, 4]); //=> [2, 4]\n     *\n     *      R.filter(isEven, {a: 1, b: 2, c: 3, d: 4}); //=> {b: 2, d: 4}\n     */\n    // else\n    var filter = _curry2(_dispatchable('filter', _xfilter, function (pred, filterable) {\n        return _isObject(filterable) ? _reduce(function (acc, key) {\n            if (pred(filterable[key])) {\n                acc[key] = filterable[key];\n            }\n            return acc;\n        }, {}, keys(filterable)) : // else\n        _filter(pred, filterable);\n    }));\n\n    /**\n     * Returns a new list by pulling every item out of it (and all its sub-arrays)\n     * and putting them in a new array, depth-first.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig [a] -> [b]\n     * @param {Array} list The array to consider.\n     * @return {Array} The flattened list.\n     * @see R.unnest\n     * @example\n     *\n     *      R.flatten([1, 2, [3, 4], 5, [6, [7, 8, [9, [10, 11], 12]]]]);\n     *      //=> [1, 2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12]\n     */\n    var flatten = _curry1(_makeFlat(true));\n\n    /**\n     * Returns a new function much like the supplied one, except that the first two\n     * arguments' order is reversed.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Function\n     * @sig (a -> b -> c -> ... -> z) -> (b -> a -> c -> ... -> z)\n     * @param {Function} fn The function to invoke with its first two parameters reversed.\n     * @return {*} The result of invoking `fn` with its first two parameters' order reversed.\n     * @example\n     *\n     *      var mergeThree = (a, b, c) => [].concat(a, b, c);\n     *\n     *      mergeThree(1, 2, 3); //=> [1, 2, 3]\n     *\n     *      R.flip(mergeThree)(1, 2, 3); //=> [2, 1, 3]\n     */\n    var flip = _curry1(function flip(fn) {\n        return curry(function (a, b) {\n            var args = _slice(arguments);\n            args[0] = b;\n            args[1] = a;\n            return fn.apply(this, args);\n        });\n    });\n\n    /**\n     * Returns the first element of the given list or string. In some libraries\n     * this function is named `first`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig [a] -> a | Undefined\n     * @sig String -> String\n     * @param {Array|String} list\n     * @return {*}\n     * @see R.tail, R.init, R.last\n     * @example\n     *\n     *      R.head(['fi', 'fo', 'fum']); //=> 'fi'\n     *      R.head([]); //=> undefined\n     *\n     *      R.head('abc'); //=> 'a'\n     *      R.head(''); //=> ''\n     */\n    var head = nth(0);\n\n    /**\n     * Returns all but the last element of the given list or string.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category List\n     * @sig [a] -> [a]\n     * @sig String -> String\n     * @param {*} list\n     * @return {*}\n     * @see R.last, R.head, R.tail\n     * @example\n     *\n     *      R.init([1, 2, 3]);  //=> [1, 2]\n     *      R.init([1, 2]);     //=> [1]\n     *      R.init([1]);        //=> []\n     *      R.init([]);         //=> []\n     *\n     *      R.init('abc');  //=> 'ab'\n     *      R.init('ab');   //=> 'a'\n     *      R.init('a');    //=> ''\n     *      R.init('');     //=> ''\n     */\n    var init = slice(0, -1);\n\n    /**\n     * Combines two lists into a set (i.e. no duplicates) composed of those\n     * elements common to both lists. Duplication is determined according to the\n     * value returned by applying the supplied predicate to two list elements.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Relation\n     * @sig (a -> a -> Boolean) -> [*] -> [*] -> [*]\n     * @param {Function} pred A predicate function that determines whether\n     *        the two supplied elements are equal.\n     * @param {Array} list1 One list of items to compare\n     * @param {Array} list2 A second list of items to compare\n     * @return {Array} A new list containing those elements common to both lists.\n     * @see R.intersection\n     * @example\n     *\n     *      var buffaloSpringfield = [\n     *        {id: 824, name: 'Richie Furay'},\n     *        {id: 956, name: 'Dewey Martin'},\n     *        {id: 313, name: 'Bruce Palmer'},\n     *        {id: 456, name: 'Stephen Stills'},\n     *        {id: 177, name: 'Neil Young'}\n     *      ];\n     *      var csny = [\n     *        {id: 204, name: 'David Crosby'},\n     *        {id: 456, name: 'Stephen Stills'},\n     *        {id: 539, name: 'Graham Nash'},\n     *        {id: 177, name: 'Neil Young'}\n     *      ];\n     *\n     *      R.intersectionWith(R.eqBy(R.prop('id')), buffaloSpringfield, csny);\n     *      //=> [{id: 456, name: 'Stephen Stills'}, {id: 177, name: 'Neil Young'}]\n     */\n    var intersectionWith = _curry3(function intersectionWith(pred, list1, list2) {\n        var lookupList, filteredList;\n        if (list1.length > list2.length) {\n            lookupList = list1;\n            filteredList = list2;\n        } else {\n            lookupList = list2;\n            filteredList = list1;\n        }\n        var results = [];\n        var idx = 0;\n        while (idx < filteredList.length) {\n            if (_containsWith(pred, filteredList[idx], lookupList)) {\n                results[results.length] = filteredList[idx];\n            }\n            idx += 1;\n        }\n        return uniqWith(pred, results);\n    });\n\n    /**\n     * Transforms the items of the list with the transducer and appends the\n     * transformed items to the accumulator using an appropriate iterator function\n     * based on the accumulator type.\n     *\n     * The accumulator can be an array, string, object or a transformer. Iterated\n     * items will be appended to arrays and concatenated to strings. Objects will\n     * be merged directly or 2-item arrays will be merged as key, value pairs.\n     *\n     * The accumulator can also be a transformer object that provides a 2-arity\n     * reducing iterator function, step, 0-arity initial value function, init, and\n     * 1-arity result extraction function result. The step function is used as the\n     * iterator function in reduce. The result function is used to convert the\n     * final accumulator into the return type and in most cases is R.identity. The\n     * init function is used to provide the initial accumulator.\n     *\n     * The iteration is performed with R.reduce after initializing the transducer.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.12.0\n     * @category List\n     * @sig a -> (b -> b) -> [c] -> a\n     * @param {*} acc The initial accumulator value.\n     * @param {Function} xf The transducer function. Receives a transformer and returns a transformer.\n     * @param {Array} list The list to iterate over.\n     * @return {*} The final, accumulated value.\n     * @example\n     *\n     *      var numbers = [1, 2, 3, 4];\n     *      var transducer = R.compose(R.map(R.add(1)), R.take(2));\n     *\n     *      R.into([], transducer, numbers); //=> [2, 3]\n     *\n     *      var intoArray = R.into([]);\n     *      intoArray(transducer, numbers); //=> [2, 3]\n     */\n    var into = _curry3(function into(acc, xf, list) {\n        return _isTransformer(acc) ? _reduce(xf(acc), acc['@@transducer/init'](), list) : _reduce(xf(_stepCat(acc)), _clone(acc, [], [], false), list);\n    });\n\n    /**\n     * Same as R.invertObj, however this accounts for objects with duplicate values\n     * by putting the values into an array.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category Object\n     * @sig {s: x} -> {x: [ s, ... ]}\n     * @param {Object} obj The object or array to invert\n     * @return {Object} out A new object with keys\n     * in an array.\n     * @example\n     *\n     *      var raceResultsByFirstName = {\n     *        first: 'alice',\n     *        second: 'jake',\n     *        third: 'alice',\n     *      };\n     *      R.invert(raceResultsByFirstName);\n     *      //=> { 'alice': ['first', 'third'], 'jake':['second'] }\n     */\n    var invert = _curry1(function invert(obj) {\n        var props = keys(obj);\n        var len = props.length;\n        var idx = 0;\n        var out = {};\n        while (idx < len) {\n            var key = props[idx];\n            var val = obj[key];\n            var list = _has(val, out) ? out[val] : out[val] = [];\n            list[list.length] = key;\n            idx += 1;\n        }\n        return out;\n    });\n\n    /**\n     * Returns a new object with the keys of the given object as values, and the\n     * values of the given object, which are coerced to strings, as keys. Note\n     * that the last key found is preferred when handling the same value.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category Object\n     * @sig {s: x} -> {x: s}\n     * @param {Object} obj The object or array to invert\n     * @return {Object} out A new object\n     * @example\n     *\n     *      var raceResults = {\n     *        first: 'alice',\n     *        second: 'jake'\n     *      };\n     *      R.invertObj(raceResults);\n     *      //=> { 'alice': 'first', 'jake':'second' }\n     *\n     *      // Alternatively:\n     *      var raceResults = ['alice', 'jake'];\n     *      R.invertObj(raceResults);\n     *      //=> { 'alice': '0', 'jake':'1' }\n     */\n    var invertObj = _curry1(function invertObj(obj) {\n        var props = keys(obj);\n        var len = props.length;\n        var idx = 0;\n        var out = {};\n        while (idx < len) {\n            var key = props[idx];\n            out[obj[key]] = key;\n            idx += 1;\n        }\n        return out;\n    });\n\n    /**\n     * Returns `true` if the given value is its type's empty value; `false`\n     * otherwise.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Logic\n     * @sig a -> Boolean\n     * @param {*} x\n     * @return {Boolean}\n     * @see R.empty\n     * @example\n     *\n     *      R.isEmpty([1, 2, 3]);   //=> false\n     *      R.isEmpty([]);          //=> true\n     *      R.isEmpty('');          //=> true\n     *      R.isEmpty(null);        //=> false\n     *      R.isEmpty({});          //=> true\n     *      R.isEmpty({length: 0}); //=> false\n     */\n    var isEmpty = _curry1(function isEmpty(x) {\n        return x != null && equals(x, empty(x));\n    });\n\n    /**\n     * Returns the last element of the given list or string.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.4\n     * @category List\n     * @sig [a] -> a | Undefined\n     * @sig String -> String\n     * @param {*} list\n     * @return {*}\n     * @see R.init, R.head, R.tail\n     * @example\n     *\n     *      R.last(['fi', 'fo', 'fum']); //=> 'fum'\n     *      R.last([]); //=> undefined\n     *\n     *      R.last('abc'); //=> 'c'\n     *      R.last(''); //=> ''\n     */\n    var last = nth(-1);\n\n    /**\n     * Returns the position of the last occurrence of an item in an array, or -1 if\n     * the item is not included in the array. `R.equals` is used to determine\n     * equality.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig a -> [a] -> Number\n     * @param {*} target The item to find.\n     * @param {Array} xs The array to search in.\n     * @return {Number} the index of the target, or -1 if the target is not found.\n     * @see R.indexOf\n     * @example\n     *\n     *      R.lastIndexOf(3, [-1,3,3,0,1,2,3,4]); //=> 6\n     *      R.lastIndexOf(10, [1,2,3,4]); //=> -1\n     */\n    var lastIndexOf = _curry2(function lastIndexOf(target, xs) {\n        if (typeof xs.lastIndexOf === 'function' && !_isArray(xs)) {\n            return xs.lastIndexOf(target);\n        } else {\n            var idx = xs.length - 1;\n            while (idx >= 0) {\n                if (equals(xs[idx], target)) {\n                    return idx;\n                }\n                idx -= 1;\n            }\n            return -1;\n        }\n    });\n\n    /**\n     * Takes a function and\n     * a [functor](https://github.com/fantasyland/fantasy-land#functor),\n     * applies the function to each of the functor's values, and returns\n     * a functor of the same shape.\n     *\n     * Ramda provides suitable `map` implementations for `Array` and `Object`,\n     * so this function may be applied to `[1, 2, 3]` or `{x: 1, y: 2, z: 3}`.\n     *\n     * Dispatches to the `map` method of the second argument, if present.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * Also treats functions as functors and will compose them together.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig Functor f => (a -> b) -> f a -> f b\n     * @param {Function} fn The function to be called on every element of the input `list`.\n     * @param {Array} list The list to be iterated over.\n     * @return {Array} The new list.\n     * @see R.transduce, R.addIndex\n     * @example\n     *\n     *      var double = x => x * 2;\n     *\n     *      R.map(double, [1, 2, 3]); //=> [2, 4, 6]\n     *\n     *      R.map(double, {x: 1, y: 2, z: 3}); //=> {x: 2, y: 4, z: 6}\n     */\n    var map = _curry2(_dispatchable('map', _xmap, function map(fn, functor) {\n        switch (Object.prototype.toString.call(functor)) {\n        case '[object Function]':\n            return curryN(functor.length, function () {\n                return fn.call(this, functor.apply(this, arguments));\n            });\n        case '[object Object]':\n            return _reduce(function (acc, key) {\n                acc[key] = fn(functor[key]);\n                return acc;\n            }, {}, keys(functor));\n        default:\n            return _map(fn, functor);\n        }\n    }));\n\n    /**\n     * An Object-specific version of `map`. The function is applied to three\n     * arguments: *(value, key, obj)*. If only the value is significant, use\n     * `map` instead.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category Object\n     * @sig ((*, String, Object) -> *) -> Object -> Object\n     * @param {Function} fn\n     * @param {Object} obj\n     * @return {Object}\n     * @see R.map\n     * @example\n     *\n     *      var values = { x: 1, y: 2, z: 3 };\n     *      var prependKeyAndDouble = (num, key, obj) => key + (num * 2);\n     *\n     *      R.mapObjIndexed(prependKeyAndDouble, values); //=> { x: 'x2', y: 'y4', z: 'z6' }\n     */\n    var mapObjIndexed = _curry2(function mapObjIndexed(fn, obj) {\n        return _reduce(function (acc, key) {\n            acc[key] = fn(obj[key], key, obj);\n            return acc;\n        }, {}, keys(obj));\n    });\n\n    /**\n     * Creates a new object with the own properties of the two provided objects. If\n     * a key exists in both objects, the provided function is applied to the values\n     * associated with the key in each object, with the result being used as the\n     * value associated with the key in the returned object. The key will be\n     * excluded from the returned object if the resulting value is `undefined`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.19.0\n     * @category Object\n     * @sig (a -> a -> a) -> {a} -> {a} -> {a}\n     * @param {Function} fn\n     * @param {Object} l\n     * @param {Object} r\n     * @return {Object}\n     * @see R.merge, R.mergeWithKey\n     * @example\n     *\n     *      R.mergeWith(R.concat,\n     *                  { a: true, values: [10, 20] },\n     *                  { b: true, values: [15, 35] });\n     *      //=> { a: true, b: true, values: [10, 20, 15, 35] }\n     */\n    var mergeWith = _curry3(function mergeWith(fn, l, r) {\n        return mergeWithKey(function (_, _l, _r) {\n            return fn(_l, _r);\n        }, l, r);\n    });\n\n    /**\n     * Takes a function `f` and a list of arguments, and returns a function `g`.\n     * When applied, `g` returns the result of applying `f` to the arguments\n     * provided initially followed by the arguments provided to `g`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.10.0\n     * @category Function\n     * @sig ((a, b, c, ..., n) -> x) -> [a, b, c, ...] -> ((d, e, f, ..., n) -> x)\n     * @param {Function} f\n     * @param {Array} args\n     * @return {Function}\n     * @see R.partialRight\n     * @example\n     *\n     *      var multiply = (a, b) => a * b;\n     *      var double = R.partial(multiply, [2]);\n     *      double(2); //=> 4\n     *\n     *      var greet = (salutation, title, firstName, lastName) =>\n     *        salutation + ', ' + title + ' ' + firstName + ' ' + lastName + '!';\n     *\n     *      var sayHello = R.partial(greet, ['Hello']);\n     *      var sayHelloToMs = R.partial(sayHello, ['Ms.']);\n     *      sayHelloToMs('Jane', 'Jones'); //=> 'Hello, Ms. Jane Jones!'\n     */\n    var partial = _createPartialApplicator(_concat);\n\n    /**\n     * Takes a function `f` and a list of arguments, and returns a function `g`.\n     * When applied, `g` returns the result of applying `f` to the arguments\n     * provided to `g` followed by the arguments provided initially.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.10.0\n     * @category Function\n     * @sig ((a, b, c, ..., n) -> x) -> [d, e, f, ..., n] -> ((a, b, c, ...) -> x)\n     * @param {Function} f\n     * @param {Array} args\n     * @return {Function}\n     * @see R.partial\n     * @example\n     *\n     *      var greet = (salutation, title, firstName, lastName) =>\n     *        salutation + ', ' + title + ' ' + firstName + ' ' + lastName + '!';\n     *\n     *      var greetMsJaneJones = R.partialRight(greet, ['Ms.', 'Jane', 'Jones']);\n     *\n     *      greetMsJaneJones('Hello'); //=> 'Hello, Ms. Jane Jones!'\n     */\n    var partialRight = _createPartialApplicator(flip(_concat));\n\n    /**\n     * Determines whether a nested path on an object has a specific value, in\n     * `R.equals` terms. Most likely used to filter a list.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.7.0\n     * @category Relation\n     * @sig [String] -> * -> {String: *} -> Boolean\n     * @param {Array} path The path of the nested property to use\n     * @param {*} val The value to compare the nested property with\n     * @param {Object} obj The object to check the nested property in\n     * @return {Boolean} `true` if the value equals the nested object property,\n     *         `false` otherwise.\n     * @example\n     *\n     *      var user1 = { address: { zipCode: 90210 } };\n     *      var user2 = { address: { zipCode: 55555 } };\n     *      var user3 = { name: 'Bob' };\n     *      var users = [ user1, user2, user3 ];\n     *      var isFamous = R.pathEq(['address', 'zipCode'], 90210);\n     *      R.filter(isFamous, users); //=> [ user1 ]\n     */\n    var pathEq = _curry3(function pathEq(_path, val, obj) {\n        return equals(path(_path, obj), val);\n    });\n\n    /**\n     * Returns a new list by plucking the same named property off all objects in\n     * the list supplied.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig k -> [{k: v}] -> [v]\n     * @param {Number|String} key The key name to pluck off of each object.\n     * @param {Array} list The array to consider.\n     * @return {Array} The list of values for the given key.\n     * @see R.props\n     * @example\n     *\n     *      R.pluck('a')([{a: 1}, {a: 2}]); //=> [1, 2]\n     *      R.pluck(0)([[1, 2], [3, 4]]);   //=> [1, 3]\n     */\n    var pluck = _curry2(function pluck(p, list) {\n        return map(prop(p), list);\n    });\n\n    /**\n     * Reasonable analog to SQL `select` statement.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Object\n     * @category Relation\n     * @sig [k] -> [{k: v}] -> [{k: v}]\n     * @param {Array} props The property names to project\n     * @param {Array} objs The objects to query\n     * @return {Array} An array of objects with just the `props` properties.\n     * @example\n     *\n     *      var abby = {name: 'Abby', age: 7, hair: 'blond', grade: 2};\n     *      var fred = {name: 'Fred', age: 12, hair: 'brown', grade: 7};\n     *      var kids = [abby, fred];\n     *      R.project(['name', 'grade'], kids); //=> [{name: 'Abby', grade: 2}, {name: 'Fred', grade: 7}]\n     */\n    // passing `identity` gives correct arity\n    var project = useWith(_map, [\n        pickAll,\n        identity\n    ]);\n\n    /**\n     * Returns `true` if the specified object property is equal, in `R.equals`\n     * terms, to the given value; `false` otherwise.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Relation\n     * @sig String -> a -> Object -> Boolean\n     * @param {String} name\n     * @param {*} val\n     * @param {*} obj\n     * @return {Boolean}\n     * @see R.equals, R.propSatisfies\n     * @example\n     *\n     *      var abby = {name: 'Abby', age: 7, hair: 'blond'};\n     *      var fred = {name: 'Fred', age: 12, hair: 'brown'};\n     *      var rusty = {name: 'Rusty', age: 10, hair: 'brown'};\n     *      var alois = {name: 'Alois', age: 15, disposition: 'surly'};\n     *      var kids = [abby, fred, rusty, alois];\n     *      var hasBrownHair = R.propEq('hair', 'brown');\n     *      R.filter(hasBrownHair, kids); //=> [fred, rusty]\n     */\n    var propEq = _curry3(function propEq(name, val, obj) {\n        return equals(val, obj[name]);\n    });\n\n    /**\n     * Returns a single item by iterating through the list, successively calling\n     * the iterator function and passing it an accumulator value and the current\n     * value from the array, and then passing the result to the next call.\n     *\n     * The iterator function receives two values: *(acc, value)*. It may use\n     * `R.reduced` to shortcut the iteration.\n     *\n     * Note: `R.reduce` does not skip deleted or unassigned indices (sparse\n     * arrays), unlike the native `Array.prototype.reduce` method. For more details\n     * on this behavior, see:\n     * https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/reduce#Description\n     *\n     * Dispatches to the `reduce` method of the third argument, if present.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig ((a, b) -> a) -> a -> [b] -> a\n     * @param {Function} fn The iterator function. Receives two values, the accumulator and the\n     *        current element from the array.\n     * @param {*} acc The accumulator value.\n     * @param {Array} list The list to iterate over.\n     * @return {*} The final, accumulated value.\n     * @see R.reduced, R.addIndex\n     * @example\n     *\n     *      var numbers = [1, 2, 3];\n     *      var plus = (a, b) => a + b;\n     *\n     *      R.reduce(plus, 10, numbers); //=> 16\n     */\n    var reduce = _curry3(_reduce);\n\n    /**\n     * Groups the elements of the list according to the result of calling\n     * the String-returning function `keyFn` on each element and reduces the elements\n     * of each group to a single value via the reducer function `valueFn`.\n     *\n     * This function is basically a more general `groupBy` function.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.20.0\n     * @category List\n     * @sig ((a, b) -> a) -> a -> (b -> String) -> [b] -> {String: a}\n     * @param {Function} valueFn The function that reduces the elements of each group to a single\n     *        value. Receives two values, accumulator for a particular group and the current element.\n     * @param {*} acc The (initial) accumulator value for each group.\n     * @param {Function} keyFn The function that maps the list's element into a key.\n     * @param {Array} list The array to group.\n     * @return {Object} An object with the output of `keyFn` for keys, mapped to the output of\n     *         `valueFn` for elements which produced that key when passed to `keyFn`.\n     * @see R.groupBy, R.reduce\n     * @example\n     *\n     *      var reduceToNamesBy = R.reduceBy((acc, student) => acc.concat(student.name), []);\n     *      var namesByGrade = reduceToNamesBy(function(student) {\n     *        var score = student.score;\n     *        return score < 65 ? 'F' :\n     *               score < 70 ? 'D' :\n     *               score < 80 ? 'C' :\n     *               score < 90 ? 'B' : 'A';\n     *      });\n     *      var students = [{name: 'Lucy', score: 92},\n     *                      {name: 'Drew', score: 85},\n     *                      // ...\n     *                      {name: 'Bart', score: 62}];\n     *      namesByGrade(students);\n     *      // {\n     *      //   'A': ['Lucy'],\n     *      //   'B': ['Drew']\n     *      //   // ...,\n     *      //   'F': ['Bart']\n     *      // }\n     */\n    var reduceBy = _curryN(4, [], _dispatchable('reduceBy', _xreduceBy, function reduceBy(valueFn, valueAcc, keyFn, list) {\n        return _reduce(function (acc, elt) {\n            var key = keyFn(elt);\n            acc[key] = valueFn(_has(key, acc) ? acc[key] : valueAcc, elt);\n            return acc;\n        }, {}, list);\n    }));\n\n    /**\n     * Like `reduce`, `reduceWhile` returns a single item by iterating through\n     * the list, successively calling the iterator function. `reduceWhile` also\n     * takes a predicate that is evaluated before each step. If the predicate returns\n     * `false`, it \"short-circuits\" the iteration and returns the current value\n     * of the accumulator.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.22.0\n     * @category List\n     * @sig ((a, b) -> Boolean) -> ((a, b) -> a) -> a -> [b] -> a\n     * @param {Function} pred The predicate. It is passed the accumulator and the\n     *        current element.\n     * @param {Function} fn The iterator function. Receives two values, the\n     *        accumulator and the current element.\n     * @param {*} a The accumulator value.\n     * @param {Array} list The list to iterate over.\n     * @return {*} The final, accumulated value.\n     * @see R.reduce, R.reduced\n     * @example\n     *\n     *      var isOdd = (acc, x) => x % 2 === 1;\n     *      var xs = [1, 3, 5, 60, 777, 800];\n     *      R.reduceWhile(isOdd, R.add, 0, xs); //=> 9\n     *\n     *      var ys = [2, 4, 6]\n     *      R.reduceWhile(isOdd, R.add, 111, ys); //=> 111\n     */\n    var reduceWhile = _curryN(4, [], function _reduceWhile(pred, fn, a, list) {\n        return _reduce(function (acc, x) {\n            return pred(acc, x) ? fn(acc, x) : _reduced(acc);\n        }, a, list);\n    });\n\n    /**\n     * The complement of `filter`.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig Filterable f => (a -> Boolean) -> f a -> f a\n     * @param {Function} pred\n     * @param {Array} filterable\n     * @return {Array}\n     * @see R.filter, R.transduce, R.addIndex\n     * @example\n     *\n     *      var isOdd = (n) => n % 2 === 1;\n     *\n     *      R.reject(isOdd, [1, 2, 3, 4]); //=> [2, 4]\n     *\n     *      R.reject(isOdd, {a: 1, b: 2, c: 3, d: 4}); //=> {b: 2, d: 4}\n     */\n    var reject = _curry2(function reject(pred, filterable) {\n        return filter(_complement(pred), filterable);\n    });\n\n    /**\n     * Returns a fixed list of size `n` containing a specified identical value.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.1\n     * @category List\n     * @sig a -> n -> [a]\n     * @param {*} value The value to repeat.\n     * @param {Number} n The desired size of the output list.\n     * @return {Array} A new array containing `n` `value`s.\n     * @example\n     *\n     *      R.repeat('hi', 5); //=> ['hi', 'hi', 'hi', 'hi', 'hi']\n     *\n     *      var obj = {};\n     *      var repeatedObjs = R.repeat(obj, 5); //=> [{}, {}, {}, {}, {}]\n     *      repeatedObjs[0] === repeatedObjs[1]; //=> true\n     */\n    var repeat = _curry2(function repeat(value, n) {\n        return times(always(value), n);\n    });\n\n    /**\n     * Adds together all the elements of a list.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Math\n     * @sig [Number] -> Number\n     * @param {Array} list An array of numbers\n     * @return {Number} The sum of all the numbers in the list.\n     * @see R.reduce\n     * @example\n     *\n     *      R.sum([2,4,6,8,100,1]); //=> 121\n     */\n    var sum = reduce(add, 0);\n\n    /**\n     * Returns a new list containing the last `n` elements of the given list.\n     * If `n > list.length`, returns a list of `list.length` elements.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.16.0\n     * @category List\n     * @sig Number -> [a] -> [a]\n     * @sig Number -> String -> String\n     * @param {Number} n The number of elements to return.\n     * @param {Array} xs The collection to consider.\n     * @return {Array}\n     * @see R.dropLast\n     * @example\n     *\n     *      R.takeLast(1, ['foo', 'bar', 'baz']); //=> ['baz']\n     *      R.takeLast(2, ['foo', 'bar', 'baz']); //=> ['bar', 'baz']\n     *      R.takeLast(3, ['foo', 'bar', 'baz']); //=> ['foo', 'bar', 'baz']\n     *      R.takeLast(4, ['foo', 'bar', 'baz']); //=> ['foo', 'bar', 'baz']\n     *      R.takeLast(3, 'ramda');               //=> 'mda'\n     */\n    var takeLast = _curry2(function takeLast(n, xs) {\n        return drop(n >= 0 ? xs.length - n : 0, xs);\n    });\n\n    /**\n     * Initializes a transducer using supplied iterator function. Returns a single\n     * item by iterating through the list, successively calling the transformed\n     * iterator function and passing it an accumulator value and the current value\n     * from the array, and then passing the result to the next call.\n     *\n     * The iterator function receives two values: *(acc, value)*. It will be\n     * wrapped as a transformer to initialize the transducer. A transformer can be\n     * passed directly in place of an iterator function. In both cases, iteration\n     * may be stopped early with the `R.reduced` function.\n     *\n     * A transducer is a function that accepts a transformer and returns a\n     * transformer and can be composed directly.\n     *\n     * A transformer is an an object that provides a 2-arity reducing iterator\n     * function, step, 0-arity initial value function, init, and 1-arity result\n     * extraction function, result. The step function is used as the iterator\n     * function in reduce. The result function is used to convert the final\n     * accumulator into the return type and in most cases is R.identity. The init\n     * function can be used to provide an initial accumulator, but is ignored by\n     * transduce.\n     *\n     * The iteration is performed with R.reduce after initializing the transducer.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.12.0\n     * @category List\n     * @sig (c -> c) -> (a,b -> a) -> a -> [b] -> a\n     * @param {Function} xf The transducer function. Receives a transformer and returns a transformer.\n     * @param {Function} fn The iterator function. Receives two values, the accumulator and the\n     *        current element from the array. Wrapped as transformer, if necessary, and used to\n     *        initialize the transducer\n     * @param {*} acc The initial accumulator value.\n     * @param {Array} list The list to iterate over.\n     * @return {*} The final, accumulated value.\n     * @see R.reduce, R.reduced, R.into\n     * @example\n     *\n     *      var numbers = [1, 2, 3, 4];\n     *      var transducer = R.compose(R.map(R.add(1)), R.take(2));\n     *\n     *      R.transduce(transducer, R.flip(R.append), [], numbers); //=> [2, 3]\n     */\n    var transduce = curryN(4, function transduce(xf, fn, acc, list) {\n        return _reduce(xf(typeof fn === 'function' ? _xwrap(fn) : fn), acc, list);\n    });\n\n    /**\n     * Combines two lists into a set (i.e. no duplicates) composed of the elements\n     * of each list. Duplication is determined according to the value returned by\n     * applying the supplied predicate to two list elements.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Relation\n     * @sig (a -> a -> Boolean) -> [*] -> [*] -> [*]\n     * @param {Function} pred A predicate used to test whether two items are equal.\n     * @param {Array} list1 The first list.\n     * @param {Array} list2 The second list.\n     * @return {Array} The first and second lists concatenated, with\n     *         duplicates removed.\n     * @see R.union\n     * @example\n     *\n     *      var l1 = [{a: 1}, {a: 2}];\n     *      var l2 = [{a: 1}, {a: 4}];\n     *      R.unionWith(R.eqBy(R.prop('a')), l1, l2); //=> [{a: 1}, {a: 2}, {a: 4}]\n     */\n    var unionWith = _curry3(function unionWith(pred, list1, list2) {\n        return uniqWith(pred, _concat(list1, list2));\n    });\n\n    /**\n     * Takes a spec object and a test object; returns true if the test satisfies\n     * the spec, false otherwise. An object satisfies the spec if, for each of the\n     * spec's own properties, accessing that property of the object gives the same\n     * value (in `R.equals` terms) as accessing that property of the spec.\n     *\n     * `whereEq` is a specialization of [`where`](#where).\n     *\n     * @func\n     * @memberOf R\n     * @since v0.14.0\n     * @category Object\n     * @sig {String: *} -> {String: *} -> Boolean\n     * @param {Object} spec\n     * @param {Object} testObj\n     * @return {Boolean}\n     * @see R.where\n     * @example\n     *\n     *      // pred :: Object -> Boolean\n     *      var pred = R.whereEq({a: 1, b: 2});\n     *\n     *      pred({a: 1});              //=> false\n     *      pred({a: 1, b: 2});        //=> true\n     *      pred({a: 1, b: 2, c: 3});  //=> true\n     *      pred({a: 1, b: 1});        //=> false\n     */\n    var whereEq = _curry2(function whereEq(spec, testObj) {\n        return where(map(equals, spec), testObj);\n    });\n\n    var _flatCat = function () {\n        var preservingReduced = function (xf) {\n            return {\n                '@@transducer/init': _xfBase.init,\n                '@@transducer/result': function (result) {\n                    return xf['@@transducer/result'](result);\n                },\n                '@@transducer/step': function (result, input) {\n                    var ret = xf['@@transducer/step'](result, input);\n                    return ret['@@transducer/reduced'] ? _forceReduced(ret) : ret;\n                }\n            };\n        };\n        return function _xcat(xf) {\n            var rxf = preservingReduced(xf);\n            return {\n                '@@transducer/init': _xfBase.init,\n                '@@transducer/result': function (result) {\n                    return rxf['@@transducer/result'](result);\n                },\n                '@@transducer/step': function (result, input) {\n                    return !isArrayLike(input) ? _reduce(rxf, result, [input]) : _reduce(rxf, result, input);\n                }\n            };\n        };\n    }();\n\n    // Array.prototype.indexOf doesn't exist below IE9\n    // manually crawl the list to distinguish between +0 and -0\n    // NaN\n    // non-zero numbers can utilise Set\n    // all these types can utilise Set\n    // null can utilise Set\n    // anything else not covered above, defer to R.equals\n    var _indexOf = function _indexOf(list, a, idx) {\n        var inf, item;\n        // Array.prototype.indexOf doesn't exist below IE9\n        if (typeof list.indexOf === 'function') {\n            switch (typeof a) {\n            case 'number':\n                if (a === 0) {\n                    // manually crawl the list to distinguish between +0 and -0\n                    inf = 1 / a;\n                    while (idx < list.length) {\n                        item = list[idx];\n                        if (item === 0 && 1 / item === inf) {\n                            return idx;\n                        }\n                        idx += 1;\n                    }\n                    return -1;\n                } else if (a !== a) {\n                    // NaN\n                    while (idx < list.length) {\n                        item = list[idx];\n                        if (typeof item === 'number' && item !== item) {\n                            return idx;\n                        }\n                        idx += 1;\n                    }\n                    return -1;\n                }\n                // non-zero numbers can utilise Set\n                return list.indexOf(a, idx);\n            // all these types can utilise Set\n            case 'string':\n            case 'boolean':\n            case 'function':\n            case 'undefined':\n                return list.indexOf(a, idx);\n            case 'object':\n                if (a === null) {\n                    // null can utilise Set\n                    return list.indexOf(a, idx);\n                }\n            }\n        }\n        // anything else not covered above, defer to R.equals\n        while (idx < list.length) {\n            if (equals(list[idx], a)) {\n                return idx;\n            }\n            idx += 1;\n        }\n        return -1;\n    };\n\n    var _xchain = _curry2(function _xchain(f, xf) {\n        return map(f, _flatCat(xf));\n    });\n\n    /**\n     * Takes a list of predicates and returns a predicate that returns true for a\n     * given list of arguments if every one of the provided predicates is satisfied\n     * by those arguments.\n     *\n     * The function returned is a curried function whose arity matches that of the\n     * highest-arity predicate.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category Logic\n     * @sig [(*... -> Boolean)] -> (*... -> Boolean)\n     * @param {Array} preds\n     * @return {Function}\n     * @see R.anyPass\n     * @example\n     *\n     *      var isQueen = R.propEq('rank', 'Q');\n     *      var isSpade = R.propEq('suit', '♠︎');\n     *      var isQueenOfSpades = R.allPass([isQueen, isSpade]);\n     *\n     *      isQueenOfSpades({rank: 'Q', suit: '♣︎'}); //=> false\n     *      isQueenOfSpades({rank: 'Q', suit: '♠︎'}); //=> true\n     */\n    var allPass = _curry1(function allPass(preds) {\n        return curryN(reduce(max, 0, pluck('length', preds)), function () {\n            var idx = 0;\n            var len = preds.length;\n            while (idx < len) {\n                if (!preds[idx].apply(this, arguments)) {\n                    return false;\n                }\n                idx += 1;\n            }\n            return true;\n        });\n    });\n\n    /**\n     * Takes a list of predicates and returns a predicate that returns true for a\n     * given list of arguments if at least one of the provided predicates is\n     * satisfied by those arguments.\n     *\n     * The function returned is a curried function whose arity matches that of the\n     * highest-arity predicate.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category Logic\n     * @sig [(*... -> Boolean)] -> (*... -> Boolean)\n     * @param {Array} preds\n     * @return {Function}\n     * @see R.allPass\n     * @example\n     *\n     *      var gte = R.anyPass([R.gt, R.equals]);\n     *\n     *      gte(3, 2); //=> true\n     *      gte(2, 2); //=> true\n     *      gte(2, 3); //=> false\n     */\n    var anyPass = _curry1(function anyPass(preds) {\n        return curryN(reduce(max, 0, pluck('length', preds)), function () {\n            var idx = 0;\n            var len = preds.length;\n            while (idx < len) {\n                if (preds[idx].apply(this, arguments)) {\n                    return true;\n                }\n                idx += 1;\n            }\n            return false;\n        });\n    });\n\n    /**\n     * ap applies a list of functions to a list of values.\n     *\n     * Dispatches to the `ap` method of the second argument, if present. Also\n     * treats curried functions as applicatives.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.3.0\n     * @category Function\n     * @sig [a -> b] -> [a] -> [b]\n     * @sig Apply f => f (a -> b) -> f a -> f b\n     * @param {Array} fns An array of functions\n     * @param {Array} vs An array of values\n     * @return {Array} An array of results of applying each of `fns` to all of `vs` in turn.\n     * @example\n     *\n     *      R.ap([R.multiply(2), R.add(3)], [1,2,3]); //=> [2, 4, 6, 4, 5, 6]\n     */\n    // else\n    var ap = _curry2(function ap(applicative, fn) {\n        return typeof applicative.ap === 'function' ? applicative.ap(fn) : typeof applicative === 'function' ? function (x) {\n            return applicative(x)(fn(x));\n        } : // else\n        _reduce(function (acc, f) {\n            return _concat(acc, map(f, fn));\n        }, [], applicative);\n    });\n\n    /**\n     * Given a spec object recursively mapping properties to functions, creates a\n     * function producing an object of the same structure, by mapping each property\n     * to the result of calling its associated function with the supplied arguments.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.20.0\n     * @category Function\n     * @sig {k: ((a, b, ..., m) -> v)} -> ((a, b, ..., m) -> {k: v})\n     * @param {Object} spec an object recursively mapping properties to functions for\n     *        producing the values for these properties.\n     * @return {Function} A function that returns an object of the same structure\n     * as `spec', with each property set to the value returned by calling its\n     * associated function with the supplied arguments.\n     * @see R.converge, R.juxt\n     * @example\n     *\n     *      var getMetrics = R.applySpec({\n     *                                      sum: R.add,\n     *                                      nested: { mul: R.multiply }\n     *                                   });\n     *      getMetrics(2, 4); // => { sum: 6, nested: { mul: 8 } }\n     */\n    var applySpec = _curry1(function applySpec(spec) {\n        spec = map(function (v) {\n            return typeof v == 'function' ? v : applySpec(v);\n        }, spec);\n        return curryN(reduce(max, 0, pluck('length', values(spec))), function () {\n            var args = arguments;\n            return map(function (f) {\n                return apply(f, args);\n            }, spec);\n        });\n    });\n\n    /**\n     * Returns the result of calling its first argument with the remaining\n     * arguments. This is occasionally useful as a converging function for\n     * `R.converge`: the left branch can produce a function while the right branch\n     * produces a value to be passed to that function as an argument.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category Function\n     * @sig (*... -> a),*... -> a\n     * @param {Function} fn The function to apply to the remaining arguments.\n     * @param {...*} args Any number of positional arguments.\n     * @return {*}\n     * @see R.apply\n     * @example\n     *\n     *      var indentN = R.pipe(R.times(R.always(' ')),\n     *                           R.join(''),\n     *                           R.replace(/^(?!$)/gm));\n     *\n     *      var format = R.converge(R.call, [\n     *                                  R.pipe(R.prop('indent'), indentN),\n     *                                  R.prop('value')\n     *                              ]);\n     *\n     *      format({indent: 2, value: 'foo\\nbar\\nbaz\\n'}); //=> '  foo\\n  bar\\n  baz\\n'\n     */\n    var call = curry(function call(fn) {\n        return fn.apply(this, _slice(arguments, 1));\n    });\n\n    /**\n     * `chain` maps a function over a list and concatenates the results. `chain`\n     * is also known as `flatMap` in some libraries\n     *\n     * Dispatches to the `chain` method of the second argument, if present,\n     * according to the [FantasyLand Chain spec](https://github.com/fantasyland/fantasy-land#chain).\n     *\n     * @func\n     * @memberOf R\n     * @since v0.3.0\n     * @category List\n     * @sig Chain m => (a -> m b) -> m a -> m b\n     * @param {Function} fn\n     * @param {Array} list\n     * @return {Array}\n     * @example\n     *\n     *      var duplicate = n => [n, n];\n     *      R.chain(duplicate, [1, 2, 3]); //=> [1, 1, 2, 2, 3, 3]\n     */\n    var chain = _curry2(_dispatchable('chain', _xchain, function chain(fn, monad) {\n        if (typeof monad === 'function') {\n            return function () {\n                return monad.call(this, fn.apply(this, arguments)).apply(this, arguments);\n            };\n        }\n        return _makeFlat(false)(map(fn, monad));\n    }));\n\n    /**\n     * Returns a function, `fn`, which encapsulates if/else-if/else logic.\n     * `R.cond` takes a list of [predicate, transform] pairs. All of the arguments\n     * to `fn` are applied to each of the predicates in turn until one returns a\n     * \"truthy\" value, at which point `fn` returns the result of applying its\n     * arguments to the corresponding transformer. If none of the predicates\n     * matches, `fn` returns undefined.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.6.0\n     * @category Logic\n     * @sig [[(*... -> Boolean),(*... -> *)]] -> (*... -> *)\n     * @param {Array} pairs\n     * @return {Function}\n     * @example\n     *\n     *      var fn = R.cond([\n     *        [R.equals(0),   R.always('water freezes at 0°C')],\n     *        [R.equals(100), R.always('water boils at 100°C')],\n     *        [R.T,           temp => 'nothing special happens at ' + temp + '°C']\n     *      ]);\n     *      fn(0); //=> 'water freezes at 0°C'\n     *      fn(50); //=> 'nothing special happens at 50°C'\n     *      fn(100); //=> 'water boils at 100°C'\n     */\n    var cond = _curry1(function cond(pairs) {\n        var arity = reduce(max, 0, map(function (pair) {\n            return pair[0].length;\n        }, pairs));\n        return _arity(arity, function () {\n            var idx = 0;\n            while (idx < pairs.length) {\n                if (pairs[idx][0].apply(this, arguments)) {\n                    return pairs[idx][1].apply(this, arguments);\n                }\n                idx += 1;\n            }\n        });\n    });\n\n    /**\n     * Wraps a constructor function inside a curried function that can be called\n     * with the same arguments and returns the same type. The arity of the function\n     * returned is specified to allow using variadic constructor functions.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.4.0\n     * @category Function\n     * @sig Number -> (* -> {*}) -> (* -> {*})\n     * @param {Number} n The arity of the constructor function.\n     * @param {Function} Fn The constructor function to wrap.\n     * @return {Function} A wrapped, curried constructor function.\n     * @example\n     *\n     *      // Variadic constructor function\n     *      var Widget = () => {\n     *        this.children = Array.prototype.slice.call(arguments);\n     *        // ...\n     *      };\n     *      Widget.prototype = {\n     *        // ...\n     *      };\n     *      var allConfigs = [\n     *        // ...\n     *      ];\n     *      R.map(R.constructN(1, Widget), allConfigs); // a list of Widgets\n     */\n    var constructN = _curry2(function constructN(n, Fn) {\n        if (n > 10) {\n            throw new Error('Constructor with greater than ten arguments');\n        }\n        if (n === 0) {\n            return function () {\n                return new Fn();\n            };\n        }\n        return curry(nAry(n, function ($0, $1, $2, $3, $4, $5, $6, $7, $8, $9) {\n            switch (arguments.length) {\n            case 1:\n                return new Fn($0);\n            case 2:\n                return new Fn($0, $1);\n            case 3:\n                return new Fn($0, $1, $2);\n            case 4:\n                return new Fn($0, $1, $2, $3);\n            case 5:\n                return new Fn($0, $1, $2, $3, $4);\n            case 6:\n                return new Fn($0, $1, $2, $3, $4, $5);\n            case 7:\n                return new Fn($0, $1, $2, $3, $4, $5, $6);\n            case 8:\n                return new Fn($0, $1, $2, $3, $4, $5, $6, $7);\n            case 9:\n                return new Fn($0, $1, $2, $3, $4, $5, $6, $7, $8);\n            case 10:\n                return new Fn($0, $1, $2, $3, $4, $5, $6, $7, $8, $9);\n            }\n        }));\n    });\n\n    /**\n     * Accepts a converging function and a list of branching functions and returns\n     * a new function. When invoked, this new function is applied to some\n     * arguments, each branching function is applied to those same arguments. The\n     * results of each branching function are passed as arguments to the converging\n     * function to produce the return value.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.4.2\n     * @category Function\n     * @sig (x1 -> x2 -> ... -> z) -> [(a -> b -> ... -> x1), (a -> b -> ... -> x2), ...] -> (a -> b -> ... -> z)\n     * @param {Function} after A function. `after` will be invoked with the return values of\n     *        `fn1` and `fn2` as its arguments.\n     * @param {Array} functions A list of functions.\n     * @return {Function} A new function.\n     * @example\n     *\n     *      var add = (a, b) => a + b;\n     *      var multiply = (a, b) => a * b;\n     *      var subtract = (a, b) => a - b;\n     *\n     *      //≅ multiply( add(1, 2), subtract(1, 2) );\n     *      R.converge(multiply, [add, subtract])(1, 2); //=> -3\n     *\n     *      var add3 = (a, b, c) => a + b + c;\n     *      R.converge(add3, [multiply, add, subtract])(1, 2); //=> 4\n     */\n    var converge = _curry2(function converge(after, fns) {\n        return curryN(reduce(max, 0, pluck('length', fns)), function () {\n            var args = arguments;\n            var context = this;\n            return after.apply(context, _map(function (fn) {\n                return fn.apply(context, args);\n            }, fns));\n        });\n    });\n\n    /**\n     * Counts the elements of a list according to how many match each value of a\n     * key generated by the supplied function. Returns an object mapping the keys\n     * produced by `fn` to the number of occurrences in the list. Note that all\n     * keys are coerced to strings because of how JavaScript objects work.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Relation\n     * @sig (a -> String) -> [a] -> {*}\n     * @param {Function} fn The function used to map values to keys.\n     * @param {Array} list The list to count elements from.\n     * @return {Object} An object mapping keys to number of occurrences in the list.\n     * @example\n     *\n     *      var numbers = [1.0, 1.1, 1.2, 2.0, 3.0, 2.2];\n     *      var letters = R.split('', 'abcABCaaaBBc');\n     *      R.countBy(Math.floor)(numbers);    //=> {'1': 3, '2': 2, '3': 1}\n     *      R.countBy(R.toLower)(letters);   //=> {'a': 5, 'b': 4, 'c': 3}\n     */\n    var countBy = reduceBy(function (acc, elem) {\n        return acc + 1;\n    }, 0);\n\n    /**\n     * Returns a new list without any consecutively repeating elements. Equality is\n     * determined by applying the supplied predicate two consecutive elements. The\n     * first element in a series of equal element is the one being preserved.\n     *\n     * Dispatches to the `dropRepeatsWith` method of the second argument, if present.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.14.0\n     * @category List\n     * @sig (a, a -> Boolean) -> [a] -> [a]\n     * @param {Function} pred A predicate used to test whether two items are equal.\n     * @param {Array} list The array to consider.\n     * @return {Array} `list` without repeating elements.\n     * @see R.transduce\n     * @example\n     *\n     *      var l = [1, -1, 1, 3, 4, -4, -4, -5, 5, 3, 3];\n     *      R.dropRepeatsWith(R.eqBy(Math.abs), l); //=> [1, 3, 4, -5, 3]\n     */\n    var dropRepeatsWith = _curry2(_dispatchable('dropRepeatsWith', _xdropRepeatsWith, function dropRepeatsWith(pred, list) {\n        var result = [];\n        var idx = 1;\n        var len = list.length;\n        if (len !== 0) {\n            result[0] = list[0];\n            while (idx < len) {\n                if (!pred(last(result), list[idx])) {\n                    result[result.length] = list[idx];\n                }\n                idx += 1;\n            }\n        }\n        return result;\n    }));\n\n    /**\n     * Takes a function and two values in its domain and returns `true` if the\n     * values map to the same value in the codomain; `false` otherwise.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.18.0\n     * @category Relation\n     * @sig (a -> b) -> a -> a -> Boolean\n     * @param {Function} f\n     * @param {*} x\n     * @param {*} y\n     * @return {Boolean}\n     * @example\n     *\n     *      R.eqBy(Math.abs, 5, -5); //=> true\n     */\n    var eqBy = _curry3(function eqBy(f, x, y) {\n        return equals(f(x), f(y));\n    });\n\n    /**\n     * Reports whether two objects have the same value, in `R.equals` terms, for\n     * the specified property. Useful as a curried predicate.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Object\n     * @sig k -> {k: v} -> {k: v} -> Boolean\n     * @param {String} prop The name of the property to compare\n     * @param {Object} obj1\n     * @param {Object} obj2\n     * @return {Boolean}\n     *\n     * @example\n     *\n     *      var o1 = { a: 1, b: 2, c: 3, d: 4 };\n     *      var o2 = { a: 10, b: 20, c: 3, d: 40 };\n     *      R.eqProps('a', o1, o2); //=> false\n     *      R.eqProps('c', o1, o2); //=> true\n     */\n    var eqProps = _curry3(function eqProps(prop, obj1, obj2) {\n        return equals(obj1[prop], obj2[prop]);\n    });\n\n    /**\n     * Splits a list into sub-lists stored in an object, based on the result of\n     * calling a String-returning function on each element, and grouping the\n     * results according to values returned.\n     *\n     * Dispatches to the `groupBy` method of the second argument, if present.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig (a -> String) -> [a] -> {String: [a]}\n     * @param {Function} fn Function :: a -> String\n     * @param {Array} list The array to group\n     * @return {Object} An object with the output of `fn` for keys, mapped to arrays of elements\n     *         that produced that key when passed to `fn`.\n     * @see R.transduce\n     * @example\n     *\n     *      var byGrade = R.groupBy(function(student) {\n     *        var score = student.score;\n     *        return score < 65 ? 'F' :\n     *               score < 70 ? 'D' :\n     *               score < 80 ? 'C' :\n     *               score < 90 ? 'B' : 'A';\n     *      });\n     *      var students = [{name: 'Abby', score: 84},\n     *                      {name: 'Eddy', score: 58},\n     *                      // ...\n     *                      {name: 'Jack', score: 69}];\n     *      byGrade(students);\n     *      // {\n     *      //   'A': [{name: 'Dianne', score: 99}],\n     *      //   'B': [{name: 'Abby', score: 84}]\n     *      //   // ...,\n     *      //   'F': [{name: 'Eddy', score: 58}]\n     *      // }\n     */\n    var groupBy = _curry2(_checkForMethod('groupBy', reduceBy(function (acc, item) {\n        if (acc == null) {\n            acc = [];\n        }\n        acc.push(item);\n        return acc;\n    }, null)));\n\n    /**\n     * Given a function that generates a key, turns a list of objects into an\n     * object indexing the objects by the given key. Note that if multiple\n     * objects generate the same value for the indexing key only the last value\n     * will be included in the generated object.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.19.0\n     * @category List\n     * @sig (a -> String) -> [{k: v}] -> {k: {k: v}}\n     * @param {Function} fn Function :: a -> String\n     * @param {Array} array The array of objects to index\n     * @return {Object} An object indexing each array element by the given property.\n     * @example\n     *\n     *      var list = [{id: 'xyz', title: 'A'}, {id: 'abc', title: 'B'}];\n     *      R.indexBy(R.prop('id'), list);\n     *      //=> {abc: {id: 'abc', title: 'B'}, xyz: {id: 'xyz', title: 'A'}}\n     */\n    var indexBy = reduceBy(function (acc, elem) {\n        return elem;\n    }, null);\n\n    /**\n     * Returns the position of the first occurrence of an item in an array, or -1\n     * if the item is not included in the array. `R.equals` is used to determine\n     * equality.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig a -> [a] -> Number\n     * @param {*} target The item to find.\n     * @param {Array} xs The array to search in.\n     * @return {Number} the index of the target, or -1 if the target is not found.\n     * @see R.lastIndexOf\n     * @example\n     *\n     *      R.indexOf(3, [1,2,3,4]); //=> 2\n     *      R.indexOf(10, [1,2,3,4]); //=> -1\n     */\n    var indexOf = _curry2(function indexOf(target, xs) {\n        return typeof xs.indexOf === 'function' && !_isArray(xs) ? xs.indexOf(target) : _indexOf(xs, target, 0);\n    });\n\n    /**\n     * juxt applies a list of functions to a list of values.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.19.0\n     * @category Function\n     * @sig [(a, b, ..., m) -> n] -> ((a, b, ..., m) -> [n])\n     * @param {Array} fns An array of functions\n     * @return {Function} A function that returns a list of values after applying each of the original `fns` to its parameters.\n     * @see R.applySpec\n     * @example\n     *\n     *      var getRange = R.juxt([Math.min, Math.max]);\n     *      getRange(3, 4, 9, -3); //=> [-3, 9]\n     */\n    var juxt = _curry1(function juxt(fns) {\n        return converge(_arrayOf, fns);\n    });\n\n    /**\n     * Returns a lens for the given getter and setter functions. The getter \"gets\"\n     * the value of the focus; the setter \"sets\" the value of the focus. The setter\n     * should not mutate the data structure.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.8.0\n     * @category Object\n     * @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s\n     * @sig (s -> a) -> ((a, s) -> s) -> Lens s a\n     * @param {Function} getter\n     * @param {Function} setter\n     * @return {Lens}\n     * @see R.view, R.set, R.over, R.lensIndex, R.lensProp\n     * @example\n     *\n     *      var xLens = R.lens(R.prop('x'), R.assoc('x'));\n     *\n     *      R.view(xLens, {x: 1, y: 2});            //=> 1\n     *      R.set(xLens, 4, {x: 1, y: 2});          //=> {x: 4, y: 2}\n     *      R.over(xLens, R.negate, {x: 1, y: 2});  //=> {x: -1, y: 2}\n     */\n    var lens = _curry2(function lens(getter, setter) {\n        return function (toFunctorFn) {\n            return function (target) {\n                return map(function (focus) {\n                    return setter(focus, target);\n                }, toFunctorFn(getter(target)));\n            };\n        };\n    });\n\n    /**\n     * Returns a lens whose focus is the specified index.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.14.0\n     * @category Object\n     * @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s\n     * @sig Number -> Lens s a\n     * @param {Number} n\n     * @return {Lens}\n     * @see R.view, R.set, R.over\n     * @example\n     *\n     *      var headLens = R.lensIndex(0);\n     *\n     *      R.view(headLens, ['a', 'b', 'c']);            //=> 'a'\n     *      R.set(headLens, 'x', ['a', 'b', 'c']);        //=> ['x', 'b', 'c']\n     *      R.over(headLens, R.toUpper, ['a', 'b', 'c']); //=> ['A', 'b', 'c']\n     */\n    var lensIndex = _curry1(function lensIndex(n) {\n        return lens(nth(n), update(n));\n    });\n\n    /**\n     * Returns a lens whose focus is the specified path.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.19.0\n     * @category Object\n     * @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s\n     * @sig [String] -> Lens s a\n     * @param {Array} path The path to use.\n     * @return {Lens}\n     * @see R.view, R.set, R.over\n     * @example\n     *\n     *      var xyLens = R.lensPath(['x', 'y']);\n     *\n     *      R.view(xyLens, {x: {y: 2, z: 3}});            //=> 2\n     *      R.set(xyLens, 4, {x: {y: 2, z: 3}});          //=> {x: {y: 4, z: 3}}\n     *      R.over(xyLens, R.negate, {x: {y: 2, z: 3}});  //=> {x: {y: -2, z: 3}}\n     */\n    var lensPath = _curry1(function lensPath(p) {\n        return lens(path(p), assocPath(p));\n    });\n\n    /**\n     * Returns a lens whose focus is the specified property.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.14.0\n     * @category Object\n     * @typedefn Lens s a = Functor f => (a -> f a) -> s -> f s\n     * @sig String -> Lens s a\n     * @param {String} k\n     * @return {Lens}\n     * @see R.view, R.set, R.over\n     * @example\n     *\n     *      var xLens = R.lensProp('x');\n     *\n     *      R.view(xLens, {x: 1, y: 2});            //=> 1\n     *      R.set(xLens, 4, {x: 1, y: 2});          //=> {x: 4, y: 2}\n     *      R.over(xLens, R.negate, {x: 1, y: 2});  //=> {x: -1, y: 2}\n     */\n    var lensProp = _curry1(function lensProp(k) {\n        return lens(prop(k), assoc(k));\n    });\n\n    /**\n     * \"lifts\" a function to be the specified arity, so that it may \"map over\" that\n     * many lists, Functions or other objects that satisfy the [FantasyLand Apply spec](https://github.com/fantasyland/fantasy-land#apply).\n     *\n     * @func\n     * @memberOf R\n     * @since v0.7.0\n     * @category Function\n     * @sig Number -> (*... -> *) -> ([*]... -> [*])\n     * @param {Function} fn The function to lift into higher context\n     * @return {Function} The lifted function.\n     * @see R.lift, R.ap\n     * @example\n     *\n     *      var madd3 = R.liftN(3, R.curryN(3, (...args) => R.sum(args)));\n     *      madd3([1,2,3], [1,2,3], [1]); //=> [3, 4, 5, 4, 5, 6, 5, 6, 7]\n     */\n    var liftN = _curry2(function liftN(arity, fn) {\n        var lifted = curryN(arity, fn);\n        return curryN(arity, function () {\n            return _reduce(ap, map(lifted, arguments[0]), _slice(arguments, 1));\n        });\n    });\n\n    /**\n     * Returns the mean of the given list of numbers.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.14.0\n     * @category Math\n     * @sig [Number] -> Number\n     * @param {Array} list\n     * @return {Number}\n     * @example\n     *\n     *      R.mean([2, 7, 9]); //=> 6\n     *      R.mean([]); //=> NaN\n     */\n    var mean = _curry1(function mean(list) {\n        return sum(list) / list.length;\n    });\n\n    /**\n     * Returns the median of the given list of numbers.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.14.0\n     * @category Math\n     * @sig [Number] -> Number\n     * @param {Array} list\n     * @return {Number}\n     * @example\n     *\n     *      R.median([2, 9, 7]); //=> 7\n     *      R.median([7, 2, 10, 9]); //=> 8\n     *      R.median([]); //=> NaN\n     */\n    var median = _curry1(function median(list) {\n        var len = list.length;\n        if (len === 0) {\n            return NaN;\n        }\n        var width = 2 - len % 2;\n        var idx = (len - width) / 2;\n        return mean(_slice(list).sort(function (a, b) {\n            return a < b ? -1 : a > b ? 1 : 0;\n        }).slice(idx, idx + width));\n    });\n\n    /**\n     * Takes a predicate and a list or other \"filterable\" object and returns the\n     * pair of filterable objects of the same type of elements which do and do not\n     * satisfy, the predicate, respectively.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.4\n     * @category List\n     * @sig Filterable f => (a -> Boolean) -> f a -> [f a, f a]\n     * @param {Function} pred A predicate to determine which side the element belongs to.\n     * @param {Array} filterable the list (or other filterable) to partition.\n     * @return {Array} An array, containing first the subset of elements that satisfy the\n     *         predicate, and second the subset of elements that do not satisfy.\n     * @see R.filter, R.reject\n     * @example\n     *\n     *      R.partition(R.contains('s'), ['sss', 'ttt', 'foo', 'bars']);\n     *      // => [ [ 'sss', 'bars' ],  [ 'ttt', 'foo' ] ]\n     *\n     *      R.partition(R.contains('s'), { a: 'sss', b: 'ttt', foo: 'bars' });\n     *      // => [ { a: 'sss', foo: 'bars' }, { b: 'ttt' }  ]\n     */\n    var partition = juxt([\n        filter,\n        reject\n    ]);\n\n    /**\n     * Performs left-to-right function composition. The leftmost function may have\n     * any arity; the remaining functions must be unary.\n     *\n     * In some libraries this function is named `sequence`.\n     *\n     * **Note:** The result of pipe is not automatically curried.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Function\n     * @sig (((a, b, ..., n) -> o), (o -> p), ..., (x -> y), (y -> z)) -> ((a, b, ..., n) -> z)\n     * @param {...Function} functions\n     * @return {Function}\n     * @see R.compose\n     * @example\n     *\n     *      var f = R.pipe(Math.pow, R.negate, R.inc);\n     *\n     *      f(3, 4); // -(3^4) + 1\n     */\n    var pipe = function pipe() {\n        if (arguments.length === 0) {\n            throw new Error('pipe requires at least one argument');\n        }\n        return _arity(arguments[0].length, reduce(_pipe, arguments[0], tail(arguments)));\n    };\n\n    /**\n     * Performs left-to-right composition of one or more Promise-returning\n     * functions. The leftmost function may have any arity; the remaining functions\n     * must be unary.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.10.0\n     * @category Function\n     * @sig ((a -> Promise b), (b -> Promise c), ..., (y -> Promise z)) -> (a -> Promise z)\n     * @param {...Function} functions\n     * @return {Function}\n     * @see R.composeP\n     * @example\n     *\n     *      //  followersForUser :: String -> Promise [User]\n     *      var followersForUser = R.pipeP(db.getUserById, db.getFollowers);\n     */\n    var pipeP = function pipeP() {\n        if (arguments.length === 0) {\n            throw new Error('pipeP requires at least one argument');\n        }\n        return _arity(arguments[0].length, reduce(_pipeP, arguments[0], tail(arguments)));\n    };\n\n    /**\n     * Multiplies together all the elements of a list.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Math\n     * @sig [Number] -> Number\n     * @param {Array} list An array of numbers\n     * @return {Number} The product of all the numbers in the list.\n     * @see R.reduce\n     * @example\n     *\n     *      R.product([2,4,6,8,100,1]); //=> 38400\n     */\n    var product = reduce(multiply, 1);\n\n    /**\n     * Transforms a [Traversable](https://github.com/fantasyland/fantasy-land#traversable)\n     * of [Applicative](https://github.com/fantasyland/fantasy-land#applicative) into an\n     * Applicative of Traversable.\n     *\n     * Dispatches to the `sequence` method of the second argument, if present.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.19.0\n     * @category List\n     * @sig (Applicative f, Traversable t) => (a -> f a) -> t (f a) -> f (t a)\n     * @param {Function} of\n     * @param {*} traversable\n     * @return {*}\n     * @see R.traverse\n     * @example\n     *\n     *      R.sequence(Maybe.of, [Just(1), Just(2), Just(3)]);   //=> Just([1, 2, 3])\n     *      R.sequence(Maybe.of, [Just(1), Just(2), Nothing()]); //=> Nothing()\n     *\n     *      R.sequence(R.of, Just([1, 2, 3])); //=> [Just(1), Just(2), Just(3)]\n     *      R.sequence(R.of, Nothing());       //=> [Nothing()]\n     */\n    var sequence = _curry2(function sequence(of, traversable) {\n        return typeof traversable.sequence === 'function' ? traversable.sequence(of) : reduceRight(function (acc, x) {\n            return ap(map(prepend, x), acc);\n        }, of([]), traversable);\n    });\n\n    /**\n     * Maps an [Applicative](https://github.com/fantasyland/fantasy-land#applicative)-returning\n     * function over a [Traversable](https://github.com/fantasyland/fantasy-land#traversable),\n     * then uses [`sequence`](#sequence) to transform the resulting Traversable of Applicative\n     * into an Applicative of Traversable.\n     *\n     * Dispatches to the `sequence` method of the third argument, if present.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.19.0\n     * @category List\n     * @sig (Applicative f, Traversable t) => (a -> f a) -> (a -> f b) -> t a -> f (t b)\n     * @param {Function} of\n     * @param {Function} f\n     * @param {*} traversable\n     * @return {*}\n     * @see R.sequence\n     * @example\n     *\n     *      // Returns `Nothing` if the given divisor is `0`\n     *      safeDiv = n => d => d === 0 ? Nothing() : Just(n / d)\n     *\n     *      R.traverse(Maybe.of, safeDiv(10), [2, 4, 5]); //=> Just([5, 2.5, 2])\n     *      R.traverse(Maybe.of, safeDiv(10), [2, 0, 5]); //=> Nothing\n     */\n    var traverse = _curry3(function traverse(of, f, traversable) {\n        return sequence(of, map(f, traversable));\n    });\n\n    /**\n     * Shorthand for `R.chain(R.identity)`, which removes one level of nesting from\n     * any [Chain](https://github.com/fantasyland/fantasy-land#chain).\n     *\n     * @func\n     * @memberOf R\n     * @since v0.3.0\n     * @category List\n     * @sig Chain c => c (c a) -> c a\n     * @param {*} list\n     * @return {*}\n     * @see R.flatten, R.chain\n     * @example\n     *\n     *      R.unnest([1, [2], [[3]]]); //=> [1, 2, [3]]\n     *      R.unnest([[1, 2], [3, 4], [5, 6]]); //=> [1, 2, 3, 4, 5, 6]\n     */\n    var unnest = chain(_identity);\n\n    var _contains = function _contains(a, list) {\n        return _indexOf(list, a, 0) >= 0;\n    };\n\n    //  mapPairs :: (Object, [String]) -> [String]\n    var _toString = function _toString(x, seen) {\n        var recur = function recur(y) {\n            var xs = seen.concat([x]);\n            return _contains(y, xs) ? '<Circular>' : _toString(y, xs);\n        };\n        //  mapPairs :: (Object, [String]) -> [String]\n        var mapPairs = function (obj, keys) {\n            return _map(function (k) {\n                return _quote(k) + ': ' + recur(obj[k]);\n            }, keys.slice().sort());\n        };\n        switch (Object.prototype.toString.call(x)) {\n        case '[object Arguments]':\n            return '(function() { return arguments; }(' + _map(recur, x).join(', ') + '))';\n        case '[object Array]':\n            return '[' + _map(recur, x).concat(mapPairs(x, reject(function (k) {\n                return /^\\d+$/.test(k);\n            }, keys(x)))).join(', ') + ']';\n        case '[object Boolean]':\n            return typeof x === 'object' ? 'new Boolean(' + recur(x.valueOf()) + ')' : x.toString();\n        case '[object Date]':\n            return 'new Date(' + (isNaN(x.valueOf()) ? recur(NaN) : _quote(_toISOString(x))) + ')';\n        case '[object Null]':\n            return 'null';\n        case '[object Number]':\n            return typeof x === 'object' ? 'new Number(' + recur(x.valueOf()) + ')' : 1 / x === -Infinity ? '-0' : x.toString(10);\n        case '[object String]':\n            return typeof x === 'object' ? 'new String(' + recur(x.valueOf()) + ')' : _quote(x);\n        case '[object Undefined]':\n            return 'undefined';\n        default:\n            if (typeof x.toString === 'function') {\n                var repr = x.toString();\n                if (repr !== '[object Object]') {\n                    return repr;\n                }\n            }\n            return '{' + mapPairs(x, keys(x)).join(', ') + '}';\n        }\n    };\n\n    /**\n     * Performs right-to-left function composition. The rightmost function may have\n     * any arity; the remaining functions must be unary.\n     *\n     * **Note:** The result of compose is not automatically curried.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Function\n     * @sig ((y -> z), (x -> y), ..., (o -> p), ((a, b, ..., n) -> o)) -> ((a, b, ..., n) -> z)\n     * @param {...Function} functions\n     * @return {Function}\n     * @see R.pipe\n     * @example\n     *\n     *      var f = R.compose(R.inc, R.negate, Math.pow);\n     *\n     *      f(3, 4); // -(3^4) + 1\n     */\n    var compose = function compose() {\n        if (arguments.length === 0) {\n            throw new Error('compose requires at least one argument');\n        }\n        return pipe.apply(this, reverse(arguments));\n    };\n\n    /**\n     * Returns the right-to-left Kleisli composition of the provided functions,\n     * each of which must return a value of a type supported by [`chain`](#chain).\n     *\n     * `R.composeK(h, g, f)` is equivalent to `R.compose(R.chain(h), R.chain(g), R.chain(f))`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.16.0\n     * @category Function\n     * @sig Chain m => ((y -> m z), (x -> m y), ..., (a -> m b)) -> (m a -> m z)\n     * @param {...Function}\n     * @return {Function}\n     * @see R.pipeK\n     * @example\n     *\n     *      //  parseJson :: String -> Maybe *\n     *      //  get :: String -> Object -> Maybe *\n     *\n     *      //  getStateCode :: Maybe String -> Maybe String\n     *      var getStateCode = R.composeK(\n     *        R.compose(Maybe.of, R.toUpper),\n     *        get('state'),\n     *        get('address'),\n     *        get('user'),\n     *        parseJson\n     *      );\n     *\n     *      getStateCode(Maybe.of('{\"user\":{\"address\":{\"state\":\"ny\"}}}'));\n     *      //=> Just('NY')\n     *      getStateCode(Maybe.of('[Invalid JSON]'));\n     *      //=> Nothing()\n     */\n    var composeK = function composeK() {\n        return compose.apply(this, prepend(identity, map(chain, arguments)));\n    };\n\n    /**\n     * Performs right-to-left composition of one or more Promise-returning\n     * functions. The rightmost function may have any arity; the remaining\n     * functions must be unary.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.10.0\n     * @category Function\n     * @sig ((y -> Promise z), (x -> Promise y), ..., (a -> Promise b)) -> (a -> Promise z)\n     * @param {...Function} functions\n     * @return {Function}\n     * @see R.pipeP\n     * @example\n     *\n     *      //  followersForUser :: String -> Promise [User]\n     *      var followersForUser = R.composeP(db.getFollowers, db.getUserById);\n     */\n    var composeP = function composeP() {\n        if (arguments.length === 0) {\n            throw new Error('composeP requires at least one argument');\n        }\n        return pipeP.apply(this, reverse(arguments));\n    };\n\n    /**\n     * Wraps a constructor function inside a curried function that can be called\n     * with the same arguments and returns the same type.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Function\n     * @sig (* -> {*}) -> (* -> {*})\n     * @param {Function} Fn The constructor function to wrap.\n     * @return {Function} A wrapped, curried constructor function.\n     * @example\n     *\n     *      // Constructor function\n     *      var Widget = config => {\n     *        // ...\n     *      };\n     *      Widget.prototype = {\n     *        // ...\n     *      };\n     *      var allConfigs = [\n     *        // ...\n     *      ];\n     *      R.map(R.construct(Widget), allConfigs); // a list of Widgets\n     */\n    var construct = _curry1(function construct(Fn) {\n        return constructN(Fn.length, Fn);\n    });\n\n    /**\n     * Returns `true` if the specified value is equal, in `R.equals` terms, to at\n     * least one element of the given list; `false` otherwise.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig a -> [a] -> Boolean\n     * @param {Object} a The item to compare against.\n     * @param {Array} list The array to consider.\n     * @return {Boolean} `true` if the item is in the list, `false` otherwise.\n     * @see R.any\n     * @example\n     *\n     *      R.contains(3, [1, 2, 3]); //=> true\n     *      R.contains(4, [1, 2, 3]); //=> false\n     *      R.contains([42], [[42]]); //=> true\n     */\n    var contains = _curry2(_contains);\n\n    /**\n     * Finds the set (i.e. no duplicates) of all elements in the first list not\n     * contained in the second list.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Relation\n     * @sig [*] -> [*] -> [*]\n     * @param {Array} list1 The first list.\n     * @param {Array} list2 The second list.\n     * @return {Array} The elements in `list1` that are not in `list2`.\n     * @see R.differenceWith, R.symmetricDifference, R.symmetricDifferenceWith\n     * @example\n     *\n     *      R.difference([1,2,3,4], [7,6,5,4,3]); //=> [1,2]\n     *      R.difference([7,6,5,4,3], [1,2,3,4]); //=> [7,6,5]\n     */\n    var difference = _curry2(function difference(first, second) {\n        var out = [];\n        var idx = 0;\n        var firstLen = first.length;\n        while (idx < firstLen) {\n            if (!_contains(first[idx], second) && !_contains(first[idx], out)) {\n                out[out.length] = first[idx];\n            }\n            idx += 1;\n        }\n        return out;\n    });\n\n    /**\n     * Returns a new list without any consecutively repeating elements. `R.equals`\n     * is used to determine equality.\n     *\n     * Dispatches to the `dropRepeats` method of the first argument, if present.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.14.0\n     * @category List\n     * @sig [a] -> [a]\n     * @param {Array} list The array to consider.\n     * @return {Array} `list` without repeating elements.\n     * @see R.transduce\n     * @example\n     *\n     *     R.dropRepeats([1, 1, 1, 2, 3, 4, 4, 2, 2]); //=> [1, 2, 3, 4, 2]\n     */\n    var dropRepeats = _curry1(_dispatchable('dropRepeats', _xdropRepeatsWith(equals), dropRepeatsWith(equals)));\n\n    /**\n     * \"lifts\" a function of arity > 1 so that it may \"map over\" a list, Function or other\n     * object that satisfies the [FantasyLand Apply spec](https://github.com/fantasyland/fantasy-land#apply).\n     *\n     * @func\n     * @memberOf R\n     * @since v0.7.0\n     * @category Function\n     * @sig (*... -> *) -> ([*]... -> [*])\n     * @param {Function} fn The function to lift into higher context\n     * @return {Function} The lifted function.\n     * @see R.liftN\n     * @example\n     *\n     *      var madd3 = R.lift(R.curry((a, b, c) => a + b + c));\n     *\n     *      madd3([1,2,3], [1,2,3], [1]); //=> [3, 4, 5, 4, 5, 6, 5, 6, 7]\n     *\n     *      var madd5 = R.lift(R.curry((a, b, c, d, e) => a + b + c + d + e));\n     *\n     *      madd5([1,2], [3], [4, 5], [6], [7, 8]); //=> [21, 22, 22, 23, 22, 23, 23, 24]\n     */\n    var lift = _curry1(function lift(fn) {\n        return liftN(fn.length, fn);\n    });\n\n    /**\n     * Returns a partial copy of an object omitting the keys specified.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Object\n     * @sig [String] -> {String: *} -> {String: *}\n     * @param {Array} names an array of String property names to omit from the new object\n     * @param {Object} obj The object to copy from\n     * @return {Object} A new object with properties from `names` not on it.\n     * @see R.pick\n     * @example\n     *\n     *      R.omit(['a', 'd'], {a: 1, b: 2, c: 3, d: 4}); //=> {b: 2, c: 3}\n     */\n    var omit = _curry2(function omit(names, obj) {\n        var result = {};\n        for (var prop in obj) {\n            if (!_contains(prop, names)) {\n                result[prop] = obj[prop];\n            }\n        }\n        return result;\n    });\n\n    /**\n     * Returns the left-to-right Kleisli composition of the provided functions,\n     * each of which must return a value of a type supported by [`chain`](#chain).\n     *\n     * `R.pipeK(f, g, h)` is equivalent to `R.pipe(R.chain(f), R.chain(g), R.chain(h))`.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.16.0\n     * @category Function\n     * @sig Chain m => ((a -> m b), (b -> m c), ..., (y -> m z)) -> (m a -> m z)\n     * @param {...Function}\n     * @return {Function}\n     * @see R.composeK\n     * @example\n     *\n     *      //  parseJson :: String -> Maybe *\n     *      //  get :: String -> Object -> Maybe *\n     *\n     *      //  getStateCode :: Maybe String -> Maybe String\n     *      var getStateCode = R.pipeK(\n     *        parseJson,\n     *        get('user'),\n     *        get('address'),\n     *        get('state'),\n     *        R.compose(Maybe.of, R.toUpper)\n     *      );\n     *\n     *      getStateCode(Maybe.of('{\"user\":{\"address\":{\"state\":\"ny\"}}}'));\n     *      //=> Just('NY')\n     *      getStateCode(Maybe.of('[Invalid JSON]'));\n     *      //=> Nothing()\n     */\n    var pipeK = function pipeK() {\n        return composeK.apply(this, reverse(arguments));\n    };\n\n    /**\n     * Returns the string representation of the given value. `eval`'ing the output\n     * should result in a value equivalent to the input value. Many of the built-in\n     * `toString` methods do not satisfy this requirement.\n     *\n     * If the given value is an `[object Object]` with a `toString` method other\n     * than `Object.prototype.toString`, this method is invoked with no arguments\n     * to produce the return value. This means user-defined constructor functions\n     * can provide a suitable `toString` method. For example:\n     *\n     *     function Point(x, y) {\n     *       this.x = x;\n     *       this.y = y;\n     *     }\n     *\n     *     Point.prototype.toString = function() {\n     *       return 'new Point(' + this.x + ', ' + this.y + ')';\n     *     };\n     *\n     *     R.toString(new Point(1, 2)); //=> 'new Point(1, 2)'\n     *\n     * @func\n     * @memberOf R\n     * @since v0.14.0\n     * @category String\n     * @sig * -> String\n     * @param {*} val\n     * @return {String}\n     * @example\n     *\n     *      R.toString(42); //=> '42'\n     *      R.toString('abc'); //=> '\"abc\"'\n     *      R.toString([1, 2, 3]); //=> '[1, 2, 3]'\n     *      R.toString({foo: 1, bar: 2, baz: 3}); //=> '{\"bar\": 2, \"baz\": 3, \"foo\": 1}'\n     *      R.toString(new Date('2001-02-03T04:05:06Z')); //=> 'new Date(\"2001-02-03T04:05:06.000Z\")'\n     */\n    var toString = _curry1(function toString(val) {\n        return _toString(val, []);\n    });\n\n    /**\n     * Returns a new list without values in the first argument.\n     * `R.equals` is used to determine equality.\n     *\n     * Acts as a transducer if a transformer is given in list position.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.19.0\n     * @category List\n     * @sig [a] -> [a] -> [a]\n     * @param {Array} list1 The values to be removed from `list2`.\n     * @param {Array} list2 The array to remove values from.\n     * @return {Array} The new array without values in `list1`.\n     * @see R.transduce\n     * @example\n     *\n     *      R.without([1, 2], [1, 2, 1, 3, 4]); //=> [3, 4]\n     */\n    var without = _curry2(function (xs, list) {\n        return reject(flip(_contains)(xs), list);\n    });\n\n    // A simple Set type that honours R.equals semantics\n    /* globals Set */\n    // until we figure out why jsdoc chokes on this\n    // @param item The item to add to the Set\n    // @returns {boolean} true if the item did not exist prior, otherwise false\n    //\n    //\n    // @param item The item to check for existence in the Set\n    // @returns {boolean} true if the item exists in the Set, otherwise false\n    //\n    //\n    // Combines the logic for checking whether an item is a member of the set and\n    // for adding a new item to the set.\n    //\n    // @param item       The item to check or add to the Set instance.\n    // @param shouldAdd  If true, the item will be added to the set if it doesn't\n    //                   already exist.\n    // @param set        The set instance to check or add to.\n    // @return {boolean} true if the item already existed, otherwise false.\n    //\n    // distinguish between +0 and -0\n    // these types can all utilise the native Set\n    // set._items['boolean'] holds a two element array\n    // representing [ falseExists, trueExists ]\n    // compare functions for reference equality\n    /* falls through */\n    // reduce the search size of heterogeneous sets by creating buckets\n    // for each type.\n    // scan through all previously applied items\n    var _Set = function () {\n        function _Set() {\n            /* globals Set */\n            this._nativeSet = typeof Set === 'function' ? new Set() : null;\n            this._items = {};\n        }\n        // until we figure out why jsdoc chokes on this\n        // @param item The item to add to the Set\n        // @returns {boolean} true if the item did not exist prior, otherwise false\n        //\n        _Set.prototype.add = function (item) {\n            return !hasOrAdd(item, true, this);\n        };\n        //\n        // @param item The item to check for existence in the Set\n        // @returns {boolean} true if the item exists in the Set, otherwise false\n        //\n        _Set.prototype.has = function (item) {\n            return hasOrAdd(item, false, this);\n        };\n        //\n        // Combines the logic for checking whether an item is a member of the set and\n        // for adding a new item to the set.\n        //\n        // @param item       The item to check or add to the Set instance.\n        // @param shouldAdd  If true, the item will be added to the set if it doesn't\n        //                   already exist.\n        // @param set        The set instance to check or add to.\n        // @return {boolean} true if the item already existed, otherwise false.\n        //\n        function hasOrAdd(item, shouldAdd, set) {\n            var type = typeof item;\n            var prevSize, newSize;\n            switch (type) {\n            case 'string':\n            case 'number':\n                // distinguish between +0 and -0\n                if (item === 0 && 1 / item === -Infinity) {\n                    if (set._items['-0']) {\n                        return true;\n                    } else {\n                        if (shouldAdd) {\n                            set._items['-0'] = true;\n                        }\n                        return false;\n                    }\n                }\n                // these types can all utilise the native Set\n                if (set._nativeSet !== null) {\n                    if (shouldAdd) {\n                        prevSize = set._nativeSet.size;\n                        set._nativeSet.add(item);\n                        newSize = set._nativeSet.size;\n                        return newSize === prevSize;\n                    } else {\n                        return set._nativeSet.has(item);\n                    }\n                } else {\n                    if (!(type in set._items)) {\n                        if (shouldAdd) {\n                            set._items[type] = {};\n                            set._items[type][item] = true;\n                        }\n                        return false;\n                    } else if (item in set._items[type]) {\n                        return true;\n                    } else {\n                        if (shouldAdd) {\n                            set._items[type][item] = true;\n                        }\n                        return false;\n                    }\n                }\n            case 'boolean':\n                // set._items['boolean'] holds a two element array\n                // representing [ falseExists, trueExists ]\n                if (type in set._items) {\n                    var bIdx = item ? 1 : 0;\n                    if (set._items[type][bIdx]) {\n                        return true;\n                    } else {\n                        if (shouldAdd) {\n                            set._items[type][bIdx] = true;\n                        }\n                        return false;\n                    }\n                } else {\n                    if (shouldAdd) {\n                        set._items[type] = item ? [\n                            false,\n                            true\n                        ] : [\n                            true,\n                            false\n                        ];\n                    }\n                    return false;\n                }\n            case 'function':\n                // compare functions for reference equality\n                if (set._nativeSet !== null) {\n                    if (shouldAdd) {\n                        prevSize = set._nativeSet.size;\n                        set._nativeSet.add(item);\n                        newSize = set._nativeSet.size;\n                        return newSize > prevSize;\n                    } else {\n                        return set._nativeSet.has(item);\n                    }\n                } else {\n                    if (!(type in set._items)) {\n                        if (shouldAdd) {\n                            set._items[type] = [item];\n                        }\n                        return false;\n                    }\n                    if (!_contains(item, set._items[type])) {\n                        if (shouldAdd) {\n                            set._items[type].push(item);\n                        }\n                        return false;\n                    }\n                    return true;\n                }\n            case 'undefined':\n                if (set._items[type]) {\n                    return true;\n                } else {\n                    if (shouldAdd) {\n                        set._items[type] = true;\n                    }\n                    return false;\n                }\n            case 'object':\n                if (item === null) {\n                    if (!set._items['null']) {\n                        if (shouldAdd) {\n                            set._items['null'] = true;\n                        }\n                        return false;\n                    }\n                    return true;\n                }\n            /* falls through */\n            default:\n                // reduce the search size of heterogeneous sets by creating buckets\n                // for each type.\n                type = Object.prototype.toString.call(item);\n                if (!(type in set._items)) {\n                    if (shouldAdd) {\n                        set._items[type] = [item];\n                    }\n                    return false;\n                }\n                // scan through all previously applied items\n                if (!_contains(item, set._items[type])) {\n                    if (shouldAdd) {\n                        set._items[type].push(item);\n                    }\n                    return false;\n                }\n                return true;\n            }\n        }\n        return _Set;\n    }();\n\n    /**\n     * A function wrapping calls to the two functions in an `&&` operation,\n     * returning the result of the first function if it is false-y and the result\n     * of the second function otherwise. Note that this is short-circuited,\n     * meaning that the second function will not be invoked if the first returns a\n     * false-y value.\n     *\n     * In addition to functions, `R.both` also accepts any fantasy-land compatible\n     * applicative functor.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.12.0\n     * @category Logic\n     * @sig (*... -> Boolean) -> (*... -> Boolean) -> (*... -> Boolean)\n     * @param {Function} f a predicate\n     * @param {Function} g another predicate\n     * @return {Function} a function that applies its arguments to `f` and `g` and `&&`s their outputs together.\n     * @see R.and\n     * @example\n     *\n     *      var gt10 = x => x > 10;\n     *      var even = x => x % 2 === 0;\n     *      var f = R.both(gt10, even);\n     *      f(100); //=> true\n     *      f(101); //=> false\n     */\n    var both = _curry2(function both(f, g) {\n        return _isFunction(f) ? function _both() {\n            return f.apply(this, arguments) && g.apply(this, arguments);\n        } : lift(and)(f, g);\n    });\n\n    /**\n     * Takes a function `f` and returns a function `g` such that:\n     *\n     *   - applying `g` to zero or more arguments will give __true__ if applying\n     *     the same arguments to `f` gives a logical __false__ value; and\n     *\n     *   - applying `g` to zero or more arguments will give __false__ if applying\n     *     the same arguments to `f` gives a logical __true__ value.\n     *\n     * `R.complement` will work on all other functors as well.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.12.0\n     * @category Logic\n     * @sig (*... -> *) -> (*... -> Boolean)\n     * @param {Function} f\n     * @return {Function}\n     * @see R.not\n     * @example\n     *\n     *      var isEven = n => n % 2 === 0;\n     *      var isOdd = R.complement(isEven);\n     *      isOdd(21); //=> true\n     *      isOdd(42); //=> false\n     */\n    var complement = lift(not);\n\n    /**\n     * Returns the result of concatenating the given lists or strings.\n     *\n     * Note: `R.concat` expects both arguments to be of the same type,\n     * unlike the native `Array.prototype.concat` method. It will throw\n     * an error if you `concat` an Array with a non-Array value.\n     *\n     * Dispatches to the `concat` method of the first argument, if present.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig [a] -> [a] -> [a]\n     * @sig String -> String -> String\n     * @param {Array|String} a\n     * @param {Array|String} b\n     * @return {Array|String}\n     *\n     * @example\n     *\n     *      R.concat([], []); //=> []\n     *      R.concat([4, 5, 6], [1, 2, 3]); //=> [4, 5, 6, 1, 2, 3]\n     *      R.concat('ABC', 'DEF'); // 'ABCDEF'\n     */\n    var concat = _curry2(function concat(a, b) {\n        if (a == null || !_isFunction(a.concat)) {\n            throw new TypeError(toString(a) + ' does not have a method named \"concat\"');\n        }\n        if (_isArray(a) && !_isArray(b)) {\n            throw new TypeError(toString(b) + ' is not an array');\n        }\n        return a.concat(b);\n    });\n\n    /**\n     * A function wrapping calls to the two functions in an `||` operation,\n     * returning the result of the first function if it is truth-y and the result\n     * of the second function otherwise. Note that this is short-circuited,\n     * meaning that the second function will not be invoked if the first returns a\n     * truth-y value.\n     *\n     * In addition to functions, `R.either` also accepts any fantasy-land compatible\n     * applicative functor.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.12.0\n     * @category Logic\n     * @sig (*... -> Boolean) -> (*... -> Boolean) -> (*... -> Boolean)\n     * @param {Function} f a predicate\n     * @param {Function} g another predicate\n     * @return {Function} a function that applies its arguments to `f` and `g` and `||`s their outputs together.\n     * @see R.or\n     * @example\n     *\n     *      var gt10 = x => x > 10;\n     *      var even = x => x % 2 === 0;\n     *      var f = R.either(gt10, even);\n     *      f(101); //=> true\n     *      f(8); //=> true\n     */\n    var either = _curry2(function either(f, g) {\n        return _isFunction(f) ? function _either() {\n            return f.apply(this, arguments) || g.apply(this, arguments);\n        } : lift(or)(f, g);\n    });\n\n    /**\n     * Turns a named method with a specified arity into a function that can be\n     * called directly supplied with arguments and a target object.\n     *\n     * The returned function is curried and accepts `arity + 1` parameters where\n     * the final parameter is the target object.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Function\n     * @sig Number -> String -> (a -> b -> ... -> n -> Object -> *)\n     * @param {Number} arity Number of arguments the returned function should take\n     *        before the target object.\n     * @param {String} method Name of the method to call.\n     * @return {Function} A new curried function.\n     * @example\n     *\n     *      var sliceFrom = R.invoker(1, 'slice');\n     *      sliceFrom(6, 'abcdefghijklm'); //=> 'ghijklm'\n     *      var sliceFrom6 = R.invoker(2, 'slice')(6);\n     *      sliceFrom6(8, 'abcdefghijklm'); //=> 'gh'\n     */\n    var invoker = _curry2(function invoker(arity, method) {\n        return curryN(arity + 1, function () {\n            var target = arguments[arity];\n            if (target != null && _isFunction(target[method])) {\n                return target[method].apply(target, _slice(arguments, 0, arity));\n            }\n            throw new TypeError(toString(target) + ' does not have a method named \"' + method + '\"');\n        });\n    });\n\n    /**\n     * Returns a string made by inserting the `separator` between each element and\n     * concatenating all the elements into a single string.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig String -> [a] -> String\n     * @param {Number|String} separator The string used to separate the elements.\n     * @param {Array} xs The elements to join into a string.\n     * @return {String} str The string made by concatenating `xs` with `separator`.\n     * @see R.split\n     * @example\n     *\n     *      var spacer = R.join(' ');\n     *      spacer(['a', 2, 3.4]);   //=> 'a 2 3.4'\n     *      R.join('|', [1, 2, 3]);    //=> '1|2|3'\n     */\n    var join = invoker(1, 'join');\n\n    /**\n     * Creates a new function that, when invoked, caches the result of calling `fn`\n     * for a given argument set and returns the result. Subsequent calls to the\n     * memoized `fn` with the same argument set will not result in an additional\n     * call to `fn`; instead, the cached result for that set of arguments will be\n     * returned.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Function\n     * @sig (*... -> a) -> (*... -> a)\n     * @param {Function} fn The function to memoize.\n     * @return {Function} Memoized version of `fn`.\n     * @example\n     *\n     *      var count = 0;\n     *      var factorial = R.memoize(n => {\n     *        count += 1;\n     *        return R.product(R.range(1, n + 1));\n     *      });\n     *      factorial(5); //=> 120\n     *      factorial(5); //=> 120\n     *      factorial(5); //=> 120\n     *      count; //=> 1\n     */\n    var memoize = _curry1(function memoize(fn) {\n        var cache = {};\n        return _arity(fn.length, function () {\n            var key = toString(arguments);\n            if (!_has(key, cache)) {\n                cache[key] = fn.apply(this, arguments);\n            }\n            return cache[key];\n        });\n    });\n\n    /**\n     * Splits a string into an array of strings based on the given\n     * separator.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category String\n     * @sig (String | RegExp) -> String -> [String]\n     * @param {String|RegExp} sep The pattern.\n     * @param {String} str The string to separate into an array.\n     * @return {Array} The array of strings from `str` separated by `str`.\n     * @see R.join\n     * @example\n     *\n     *      var pathComponents = R.split('/');\n     *      R.tail(pathComponents('/usr/local/bin/node')); //=> ['usr', 'local', 'bin', 'node']\n     *\n     *      R.split('.', 'a.b.c.xyz.d'); //=> ['a', 'b', 'c', 'xyz', 'd']\n     */\n    var split = invoker(1, 'split');\n\n    /**\n     * Finds the set (i.e. no duplicates) of all elements contained in the first or\n     * second list, but not both.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.19.0\n     * @category Relation\n     * @sig [*] -> [*] -> [*]\n     * @param {Array} list1 The first list.\n     * @param {Array} list2 The second list.\n     * @return {Array} The elements in `list1` or `list2`, but not both.\n     * @see R.symmetricDifferenceWith, R.difference, R.differenceWith\n     * @example\n     *\n     *      R.symmetricDifference([1,2,3,4], [7,6,5,4,3]); //=> [1,2,7,6,5]\n     *      R.symmetricDifference([7,6,5,4,3], [1,2,3,4]); //=> [7,6,5,1,2]\n     */\n    var symmetricDifference = _curry2(function symmetricDifference(list1, list2) {\n        return concat(difference(list1, list2), difference(list2, list1));\n    });\n\n    /**\n     * Finds the set (i.e. no duplicates) of all elements contained in the first or\n     * second list, but not both. Duplication is determined according to the value\n     * returned by applying the supplied predicate to two list elements.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.19.0\n     * @category Relation\n     * @sig (a -> a -> Boolean) -> [a] -> [a] -> [a]\n     * @param {Function} pred A predicate used to test whether two items are equal.\n     * @param {Array} list1 The first list.\n     * @param {Array} list2 The second list.\n     * @return {Array} The elements in `list1` or `list2`, but not both.\n     * @see R.symmetricDifference, R.difference, R.differenceWith\n     * @example\n     *\n     *      var eqA = R.eqBy(R.prop('a'));\n     *      var l1 = [{a: 1}, {a: 2}, {a: 3}, {a: 4}];\n     *      var l2 = [{a: 3}, {a: 4}, {a: 5}, {a: 6}];\n     *      R.symmetricDifferenceWith(eqA, l1, l2); //=> [{a: 1}, {a: 2}, {a: 5}, {a: 6}]\n     */\n    var symmetricDifferenceWith = _curry3(function symmetricDifferenceWith(pred, list1, list2) {\n        return concat(differenceWith(pred, list1, list2), differenceWith(pred, list2, list1));\n    });\n\n    /**\n     * Determines whether a given string matches a given regular expression.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.12.0\n     * @category String\n     * @sig RegExp -> String -> Boolean\n     * @param {RegExp} pattern\n     * @param {String} str\n     * @return {Boolean}\n     * @see R.match\n     * @example\n     *\n     *      R.test(/^x/, 'xyz'); //=> true\n     *      R.test(/^y/, 'xyz'); //=> false\n     */\n    var test = _curry2(function test(pattern, str) {\n        if (!_isRegExp(pattern)) {\n            throw new TypeError('\\u2018test\\u2019 requires a value of type RegExp as its first argument; received ' + toString(pattern));\n        }\n        return _cloneRegExp(pattern).test(str);\n    });\n\n    /**\n     * The lower case version of a string.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category String\n     * @sig String -> String\n     * @param {String} str The string to lower case.\n     * @return {String} The lower case version of `str`.\n     * @see R.toUpper\n     * @example\n     *\n     *      R.toLower('XYZ'); //=> 'xyz'\n     */\n    var toLower = invoker(0, 'toLowerCase');\n\n    /**\n     * The upper case version of a string.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.9.0\n     * @category String\n     * @sig String -> String\n     * @param {String} str The string to upper case.\n     * @return {String} The upper case version of `str`.\n     * @see R.toLower\n     * @example\n     *\n     *      R.toUpper('abc'); //=> 'ABC'\n     */\n    var toUpper = invoker(0, 'toUpperCase');\n\n    /**\n     * Returns a new list containing only one copy of each element in the original\n     * list, based upon the value returned by applying the supplied function to\n     * each list element. Prefers the first item if the supplied function produces\n     * the same value on two items. `R.equals` is used for comparison.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.16.0\n     * @category List\n     * @sig (a -> b) -> [a] -> [a]\n     * @param {Function} fn A function used to produce a value to use during comparisons.\n     * @param {Array} list The array to consider.\n     * @return {Array} The list of unique items.\n     * @example\n     *\n     *      R.uniqBy(Math.abs, [-1, -5, 2, 10, 1, 2]); //=> [-1, -5, 2, 10]\n     */\n    var uniqBy = _curry2(function uniqBy(fn, list) {\n        var set = new _Set();\n        var result = [];\n        var idx = 0;\n        var appliedItem, item;\n        while (idx < list.length) {\n            item = list[idx];\n            appliedItem = fn(item);\n            if (set.add(appliedItem)) {\n                result.push(item);\n            }\n            idx += 1;\n        }\n        return result;\n    });\n\n    /**\n     * Returns a new list containing only one copy of each element in the original\n     * list. `R.equals` is used to determine equality.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category List\n     * @sig [a] -> [a]\n     * @param {Array} list The array to consider.\n     * @return {Array} The list of unique items.\n     * @example\n     *\n     *      R.uniq([1, 1, 2, 1]); //=> [1, 2]\n     *      R.uniq([1, '1']);     //=> [1, '1']\n     *      R.uniq([[42], [42]]); //=> [[42]]\n     */\n    var uniq = uniqBy(identity);\n\n    /**\n     * Combines two lists into a set (i.e. no duplicates) composed of those\n     * elements common to both lists.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Relation\n     * @sig [*] -> [*] -> [*]\n     * @param {Array} list1 The first list.\n     * @param {Array} list2 The second list.\n     * @return {Array} The list of elements found in both `list1` and `list2`.\n     * @see R.intersectionWith\n     * @example\n     *\n     *      R.intersection([1,2,3,4], [7,6,5,4,3]); //=> [4, 3]\n     */\n    var intersection = _curry2(function intersection(list1, list2) {\n        var lookupList, filteredList;\n        if (list1.length > list2.length) {\n            lookupList = list1;\n            filteredList = list2;\n        } else {\n            lookupList = list2;\n            filteredList = list1;\n        }\n        return uniq(_filter(flip(_contains)(lookupList), filteredList));\n    });\n\n    /**\n     * Combines two lists into a set (i.e. no duplicates) composed of the elements\n     * of each list.\n     *\n     * @func\n     * @memberOf R\n     * @since v0.1.0\n     * @category Relation\n     * @sig [*] -> [*] -> [*]\n     * @param {Array} as The first list.\n     * @param {Array} bs The second list.\n     * @return {Array} The first and second lists concatenated, with\n     *         duplicates removed.\n     * @example\n     *\n     *      R.union([1, 2, 3], [2, 3, 4]); //=> [1, 2, 3, 4]\n     */\n    var union = _curry2(compose(uniq, _concat));\n\n    var R = {\n        F: F,\n        T: T,\n        __: __,\n        add: add,\n        addIndex: addIndex,\n        adjust: adjust,\n        all: all,\n        allPass: allPass,\n        always: always,\n        and: and,\n        any: any,\n        anyPass: anyPass,\n        ap: ap,\n        aperture: aperture,\n        append: append,\n        apply: apply,\n        applySpec: applySpec,\n        assoc: assoc,\n        assocPath: assocPath,\n        binary: binary,\n        bind: bind,\n        both: both,\n        call: call,\n        chain: chain,\n        clamp: clamp,\n        clone: clone,\n        comparator: comparator,\n        complement: complement,\n        compose: compose,\n        composeK: composeK,\n        composeP: composeP,\n        concat: concat,\n        cond: cond,\n        construct: construct,\n        constructN: constructN,\n        contains: contains,\n        converge: converge,\n        countBy: countBy,\n        curry: curry,\n        curryN: curryN,\n        dec: dec,\n        defaultTo: defaultTo,\n        difference: difference,\n        differenceWith: differenceWith,\n        dissoc: dissoc,\n        dissocPath: dissocPath,\n        divide: divide,\n        drop: drop,\n        dropLast: dropLast,\n        dropLastWhile: dropLastWhile,\n        dropRepeats: dropRepeats,\n        dropRepeatsWith: dropRepeatsWith,\n        dropWhile: dropWhile,\n        either: either,\n        empty: empty,\n        eqBy: eqBy,\n        eqProps: eqProps,\n        equals: equals,\n        evolve: evolve,\n        filter: filter,\n        find: find,\n        findIndex: findIndex,\n        findLast: findLast,\n        findLastIndex: findLastIndex,\n        flatten: flatten,\n        flip: flip,\n        forEach: forEach,\n        fromPairs: fromPairs,\n        groupBy: groupBy,\n        groupWith: groupWith,\n        gt: gt,\n        gte: gte,\n        has: has,\n        hasIn: hasIn,\n        head: head,\n        identical: identical,\n        identity: identity,\n        ifElse: ifElse,\n        inc: inc,\n        indexBy: indexBy,\n        indexOf: indexOf,\n        init: init,\n        insert: insert,\n        insertAll: insertAll,\n        intersection: intersection,\n        intersectionWith: intersectionWith,\n        intersperse: intersperse,\n        into: into,\n        invert: invert,\n        invertObj: invertObj,\n        invoker: invoker,\n        is: is,\n        isArrayLike: isArrayLike,\n        isEmpty: isEmpty,\n        isNil: isNil,\n        join: join,\n        juxt: juxt,\n        keys: keys,\n        keysIn: keysIn,\n        last: last,\n        lastIndexOf: lastIndexOf,\n        length: length,\n        lens: lens,\n        lensIndex: lensIndex,\n        lensPath: lensPath,\n        lensProp: lensProp,\n        lift: lift,\n        liftN: liftN,\n        lt: lt,\n        lte: lte,\n        map: map,\n        mapAccum: mapAccum,\n        mapAccumRight: mapAccumRight,\n        mapObjIndexed: mapObjIndexed,\n        match: match,\n        mathMod: mathMod,\n        max: max,\n        maxBy: maxBy,\n        mean: mean,\n        median: median,\n        memoize: memoize,\n        merge: merge,\n        mergeAll: mergeAll,\n        mergeWith: mergeWith,\n        mergeWithKey: mergeWithKey,\n        min: min,\n        minBy: minBy,\n        modulo: modulo,\n        multiply: multiply,\n        nAry: nAry,\n        negate: negate,\n        none: none,\n        not: not,\n        nth: nth,\n        nthArg: nthArg,\n        objOf: objOf,\n        of: of,\n        omit: omit,\n        once: once,\n        or: or,\n        over: over,\n        pair: pair,\n        partial: partial,\n        partialRight: partialRight,\n        partition: partition,\n        path: path,\n        pathEq: pathEq,\n        pathOr: pathOr,\n        pathSatisfies: pathSatisfies,\n        pick: pick,\n        pickAll: pickAll,\n        pickBy: pickBy,\n        pipe: pipe,\n        pipeK: pipeK,\n        pipeP: pipeP,\n        pluck: pluck,\n        prepend: prepend,\n        product: product,\n        project: project,\n        prop: prop,\n        propEq: propEq,\n        propIs: propIs,\n        propOr: propOr,\n        propSatisfies: propSatisfies,\n        props: props,\n        range: range,\n        reduce: reduce,\n        reduceBy: reduceBy,\n        reduceRight: reduceRight,\n        reduceWhile: reduceWhile,\n        reduced: reduced,\n        reject: reject,\n        remove: remove,\n        repeat: repeat,\n        replace: replace,\n        reverse: reverse,\n        scan: scan,\n        sequence: sequence,\n        set: set,\n        slice: slice,\n        sort: sort,\n        sortBy: sortBy,\n        split: split,\n        splitAt: splitAt,\n        splitEvery: splitEvery,\n        splitWhen: splitWhen,\n        subtract: subtract,\n        sum: sum,\n        symmetricDifference: symmetricDifference,\n        symmetricDifferenceWith: symmetricDifferenceWith,\n        tail: tail,\n        take: take,\n        takeLast: takeLast,\n        takeLastWhile: takeLastWhile,\n        takeWhile: takeWhile,\n        tap: tap,\n        test: test,\n        times: times,\n        toLower: toLower,\n        toPairs: toPairs,\n        toPairsIn: toPairsIn,\n        toString: toString,\n        toUpper: toUpper,\n        transduce: transduce,\n        transpose: transpose,\n        traverse: traverse,\n        trim: trim,\n        tryCatch: tryCatch,\n        type: type,\n        unapply: unapply,\n        unary: unary,\n        uncurryN: uncurryN,\n        unfold: unfold,\n        union: union,\n        unionWith: unionWith,\n        uniq: uniq,\n        uniqBy: uniqBy,\n        uniqWith: uniqWith,\n        unless: unless,\n        unnest: unnest,\n        until: until,\n        update: update,\n        useWith: useWith,\n        values: values,\n        valuesIn: valuesIn,\n        view: view,\n        when: when,\n        where: where,\n        whereEq: whereEq,\n        without: without,\n        wrap: wrap,\n        xprod: xprod,\n        zip: zip,\n        zipObj: zipObj,\n        zipWith: zipWith\n    };\n  /* eslint-env amd */\n\n  /* TEST_ENTRY_POINT */\n\n  if (typeof exports === 'object') {\n    module.exports = R;\n  } else if (typeof define === 'function' && define.amd) {\n    define(function() { return R; });\n  } else {\n    this.R = R;\n  }\n\n}.call(this));\n"]}
require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
function createElement(tagName){
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function createElementNS(namespaceURI, qualifiedName){
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function createTextNode(text){
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function insertBefore(parentNode, newNode, referenceNode){
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function removeChild(node, child){
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function appendChild(node, child){
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function parentNode(node){
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function nextSibling(node){
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}

function tagName(node){
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function setTextContent(node, text){
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module.exports = {
  createElement: createElement,
  createElementNS: createElementNS,
  createTextNode: createTextNode,
  appendChild: appendChild,
  removeChild: removeChild,
  insertBefore: insertBefore,
  parentNode: parentNode,
  nextSibling: nextSibling,
  tagName: tagName,
  setTextContent: setTextContent
};

},{}],2:[function(require,module,exports){
module.exports = {
  array: Array.isArray,
  primitive: function(s) { return typeof s === 'string' || typeof s === 'number'; },
};

},{}],3:[function(require,module,exports){
module.exports = function(sel, data, children, text, elm) {
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          text: text, elm: elm, key: key};
};

},{}],"snabbdom":[function(require,module,exports){
// jshint newcap: false
/* global require, module, document, Node */
'use strict';

var VNode = require('./vnode');
var is = require('./is');
var domApi = require('./htmldomapi');

function isUndef(s) { return s === undefined; }
function isDef(s) { return s !== undefined; }

var emptyNode = VNode('', {}, [], undefined, undefined);

function sameVnode(vnode1, vnode2) {
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}

function createKeyToOldIdx(children, beginIdx, endIdx) {
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    if (isDef(key)) map[key] = i;
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}

var hooks = ['create', 'update', 'remove', 'destroy', 'pre', 'post'];

function init(modules, api) {
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  if (isUndef(api)) api = domApi;

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    var id = elm.id ? '#' + elm.id : '';
    var c = elm.className ? '.' + elm.className.split(' ').join('.') : '';
    return VNode(api.tagName(elm).toLowerCase() + id + c, {}, [], undefined, elm);
  }

  function createRmCb(childElm, listeners) {
    return function() {
      if (--listeners === 0) {
        var parent = api.parentNode(childElm);
        api.removeChild(parent, childElm);
      }
    };
  }

  function createElm(vnode, insertedVnodeQueue) {
    var i, data = vnode.data;
    if (isDef(data)) {
      if (isDef(i = data.hook) && isDef(i = i.init)) {
        i(vnode);
        data = vnode.data;
      }
    }
    var elm, children = vnode.children, sel = vnode.sel;
    if (isDef(sel)) {
      // Parse selector
      var hashIdx = sel.indexOf('#');
      var dotIdx = sel.indexOf('.', hashIdx);
      var hash = hashIdx > 0 ? hashIdx : sel.length;
      var dot = dotIdx > 0 ? dotIdx : sel.length;
      var tag = hashIdx !== -1 || dotIdx !== -1 ? sel.slice(0, Math.min(hash, dot)) : sel;
      elm = vnode.elm = isDef(data) && isDef(i = data.ns) ? api.createElementNS(i, tag)
                                                          : api.createElement(tag);
      if (hash < dot) elm.id = sel.slice(hash + 1, dot);
      if (dotIdx > 0) elm.className = sel.slice(dot + 1).replace(/\./g, ' ');
      if (is.array(children)) {
        for (i = 0; i < children.length; ++i) {
          api.appendChild(elm, createElm(children[i], insertedVnodeQueue));
        }
      } else if (is.primitive(vnode.text)) {
        api.appendChild(elm, api.createTextNode(vnode.text));
      }
      for (i = 0; i < cbs.create.length; ++i) cbs.create[i](emptyNode, vnode);
      i = vnode.data.hook; // Reuse variable
      if (isDef(i)) {
        if (i.create) i.create(emptyNode, vnode);
        if (i.insert) insertedVnodeQueue.push(vnode);
      }
    } else {
      elm = vnode.elm = api.createTextNode(vnode.text);
    }
    return vnode.elm;
  }

  function addVnodes(parentElm, before, vnodes, startIdx, endIdx, insertedVnodeQueue) {
    for (; startIdx <= endIdx; ++startIdx) {
      api.insertBefore(parentElm, createElm(vnodes[startIdx], insertedVnodeQueue), before);
    }
  }

  function invokeDestroyHook(vnode) {
    var i, j, data = vnode.data;
    if (isDef(data)) {
      if (isDef(i = data.hook) && isDef(i = i.destroy)) i(vnode);
      for (i = 0; i < cbs.destroy.length; ++i) cbs.destroy[i](vnode);
      if (isDef(i = vnode.children)) {
        for (j = 0; j < vnode.children.length; ++j) {
          invokeDestroyHook(vnode.children[j]);
        }
      }
    }
  }

  function removeVnodes(parentElm, vnodes, startIdx, endIdx) {
    for (; startIdx <= endIdx; ++startIdx) {
      var i, listeners, rm, ch = vnodes[startIdx];
      if (isDef(ch)) {
        if (isDef(ch.sel)) {
          invokeDestroyHook(ch);
          listeners = cbs.remove.length + 1;
          rm = createRmCb(ch.elm, listeners);
          for (i = 0; i < cbs.remove.length; ++i) cbs.remove[i](ch, rm);
          if (isDef(i = ch.data) && isDef(i = i.hook) && isDef(i = i.remove)) {
            i(ch, rm);
          } else {
            rm();
          }
        } else { // Text node
          api.removeChild(parentElm, ch.elm);
        }
      }
    }
  }

  function updateChildren(parentElm, oldCh, newCh, insertedVnodeQueue) {
    var oldStartIdx = 0, newStartIdx = 0;
    var oldEndIdx = oldCh.length - 1;
    var oldStartVnode = oldCh[0];
    var oldEndVnode = oldCh[oldEndIdx];
    var newEndIdx = newCh.length - 1;
    var newStartVnode = newCh[0];
    var newEndVnode = newCh[newEndIdx];
    var oldKeyToIdx, idxInOld, elmToMove, before;

    while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {
      if (isUndef(oldStartVnode)) {
        oldStartVnode = oldCh[++oldStartIdx]; // Vnode has been moved left
      } else if (isUndef(oldEndVnode)) {
        oldEndVnode = oldCh[--oldEndIdx];
      } else if (sameVnode(oldStartVnode, newStartVnode)) {
        patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue);
        oldStartVnode = oldCh[++oldStartIdx];
        newStartVnode = newCh[++newStartIdx];
      } else if (sameVnode(oldEndVnode, newEndVnode)) {
        patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue);
        oldEndVnode = oldCh[--oldEndIdx];
        newEndVnode = newCh[--newEndIdx];
      } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right
        patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue);
        api.insertBefore(parentElm, oldStartVnode.elm, api.nextSibling(oldEndVnode.elm));
        oldStartVnode = oldCh[++oldStartIdx];
        newEndVnode = newCh[--newEndIdx];
      } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left
        patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue);
        api.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);
        oldEndVnode = oldCh[--oldEndIdx];
        newStartVnode = newCh[++newStartIdx];
      } else {
        if (isUndef(oldKeyToIdx)) oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx);
        idxInOld = oldKeyToIdx[newStartVnode.key];
        if (isUndef(idxInOld)) { // New element
          api.insertBefore(parentElm, createElm(newStartVnode, insertedVnodeQueue), oldStartVnode.elm);
          newStartVnode = newCh[++newStartIdx];
        } else {
          elmToMove = oldCh[idxInOld];
          patchVnode(elmToMove, newStartVnode, insertedVnodeQueue);
          oldCh[idxInOld] = undefined;
          api.insertBefore(parentElm, elmToMove.elm, oldStartVnode.elm);
          newStartVnode = newCh[++newStartIdx];
        }
      }
    }
    if (oldStartIdx > oldEndIdx) {
      before = isUndef(newCh[newEndIdx+1]) ? null : newCh[newEndIdx+1].elm;
      addVnodes(parentElm, before, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);
    } else if (newStartIdx > newEndIdx) {
      removeVnodes(parentElm, oldCh, oldStartIdx, oldEndIdx);
    }
  }

  function patchVnode(oldVnode, vnode, insertedVnodeQueue) {
    var i, hook;
    if (isDef(i = vnode.data) && isDef(hook = i.hook) && isDef(i = hook.prepatch)) {
      i(oldVnode, vnode);
    }
    var elm = vnode.elm = oldVnode.elm, oldCh = oldVnode.children, ch = vnode.children;
    if (oldVnode === vnode) return;
    if (!sameVnode(oldVnode, vnode)) {
      var parentElm = api.parentNode(oldVnode.elm);
      elm = createElm(vnode, insertedVnodeQueue);
      api.insertBefore(parentElm, elm, oldVnode.elm);
      removeVnodes(parentElm, [oldVnode], 0, 0);
      return;
    }
    if (isDef(vnode.data)) {
      for (i = 0; i < cbs.update.length; ++i) cbs.update[i](oldVnode, vnode);
      i = vnode.data.hook;
      if (isDef(i) && isDef(i = i.update)) i(oldVnode, vnode);
    }
    if (isUndef(vnode.text)) {
      if (isDef(oldCh) && isDef(ch)) {
        if (oldCh !== ch) updateChildren(elm, oldCh, ch, insertedVnodeQueue);
      } else if (isDef(ch)) {
        if (isDef(oldVnode.text)) api.setTextContent(elm, '');
        addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);
      } else if (isDef(oldCh)) {
        removeVnodes(elm, oldCh, 0, oldCh.length - 1);
      } else if (isDef(oldVnode.text)) {
        api.setTextContent(elm, '');
      }
    } else if (oldVnode.text !== vnode.text) {
      api.setTextContent(elm, vnode.text);
    }
    if (isDef(hook) && isDef(i = hook.postpatch)) {
      i(oldVnode, vnode);
    }
  }

  return function(oldVnode, vnode) {
    var i, elm, parent;
    var insertedVnodeQueue = [];
    for (i = 0; i < cbs.pre.length; ++i) cbs.pre[i]();

    if (isUndef(oldVnode.sel)) {
      oldVnode = emptyNodeAt(oldVnode);
    }

    if (sameVnode(oldVnode, vnode)) {
      patchVnode(oldVnode, vnode, insertedVnodeQueue);
    } else {
      elm = oldVnode.elm;
      parent = api.parentNode(elm);

      createElm(vnode, insertedVnodeQueue);

      if (parent !== null) {
        api.insertBefore(parent, vnode.elm, api.nextSibling(elm));
        removeVnodes(parent, [oldVnode], 0, 0);
      }
    }

    for (i = 0; i < insertedVnodeQueue.length; ++i) {
      insertedVnodeQueue[i].data.hook.insert(insertedVnodeQueue[i]);
    }
    for (i = 0; i < cbs.post.length; ++i) cbs.post[i]();
    return vnode;
  };
}

module.exports = {init: init};

},{"./htmldomapi":1,"./is":2,"./vnode":3}]},{},[])
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'#' + elm.id : '';\n    var c = elm.className ? '.' + elm.className.split(' ').join('.') : '';\n    return VNode(api.tagName(elm).toLowerCase() + id + c, {}, [], undefined, elm);\n  }\n\n  function createRmCb(childElm, listeners) {\n    return function() {\n      if (--listeners === 0) {\n        var parent = api.parentNode(childElm);\n        api.removeChild(parent, childElm);\n      }\n    };\n  }\n\n  function createElm(vnode, insertedVnodeQueue) {\n    var i, data = vnode.data;\n    if (isDef(data)) {\n      if (isDef(i = data.hook) && isDef(i = i.init)) {\n        i(vnode);\n        data = vnode.data;\n      }\n    }\n    var elm, children = vnode.children, sel = vnode.sel;\n    if (isDef(sel)) {\n      // Parse selector\n      var hashIdx = sel.indexOf('#');\n      var dotIdx = sel.indexOf('.', hashIdx);\n      var hash = hashIdx > 0 ? hashIdx : sel.length;\n      var dot = dotIdx > 0 ? dotIdx : sel.length;\n      var tag = hashIdx !== -1 || dotIdx !== -1 ? sel.slice(0, Math.min(hash, dot)) : sel;\n      elm = vnode.elm = isDef(data) && isDef(i = data.ns) ? api.createElementNS(i, tag)\n                                                          : api.createElement(tag);\n      if (hash < dot) elm.id = sel.slice(hash + 1, dot);\n      if (dotIdx > 0) elm.className = sel.slice(dot + 1).replace(/\\./g, ' ');\n      if (is.array(children)) {\n        for (i = 0; i < children.length; ++i) {\n          api.appendChild(elm, createElm(children[i], insertedVnodeQueue));\n        }\n      } else if (is.primitive(vnode.text)) {\n        api.appendChild(elm, api.createTextNode(vnode.text));\n      }\n      for (i = 0; i < cbs.create.length; ++i) cbs.create[i](emptyNode, vnode);\n      i = vnode.data.hook; // Reuse variable\n      if (isDef(i)) {\n        if (i.create) i.create(emptyNode, vnode);\n        if (i.insert) insertedVnodeQueue.push(vnode);\n      }\n    } else {\n      elm = vnode.elm = api.createTextNode(vnode.text);\n    }\n    return vnode.elm;\n  }\n\n  function addVnodes(parentElm, before, vnodes, startIdx, endIdx, insertedVnodeQueue) {\n    for (; startIdx <= endIdx; ++startIdx) {\n      api.insertBefore(parentElm, createElm(vnodes[startIdx], insertedVnodeQueue), before);\n    }\n  }\n\n  function invokeDestroyHook(vnode) {\n    var i, j, data = vnode.data;\n    if (isDef(data)) {\n      if (isDef(i = data.hook) && isDef(i = i.destroy)) i(vnode);\n      for (i = 0; i < cbs.destroy.length; ++i) cbs.destroy[i](vnode);\n      if (isDef(i = vnode.children)) {\n        for (j = 0; j < vnode.children.length; ++j) {\n          invokeDestroyHook(vnode.children[j]);\n        }\n      }\n    }\n  }\n\n  function removeVnodes(parentElm, vnodes, startIdx, endIdx) {\n    for (; startIdx <= endIdx; ++startIdx) {\n      var i, listeners, rm, ch = vnodes[startIdx];\n      if (isDef(ch)) {\n        if (isDef(ch.sel)) {\n          invokeDestroyHook(ch);\n          listeners = cbs.remove.length + 1;\n          rm = createRmCb(ch.elm, listeners);\n          for (i = 0; i < cbs.remove.length; ++i) cbs.remove[i](ch, rm);\n          if (isDef(i = ch.data) && isDef(i = i.hook) && isDef(i = i.remove)) {\n            i(ch, rm);\n          } else {\n            rm();\n          }\n        } else { // Text node\n          api.removeChild(parentElm, ch.elm);\n        }\n      }\n    }\n  }\n\n  function updateChildren(parentElm, oldCh, newCh, insertedVnodeQueue) {\n    var oldStartIdx = 0, newStartIdx = 0;\n    var oldEndIdx = oldCh.length - 1;\n    var oldStartVnode = oldCh[0];\n    var oldEndVnode = oldCh[oldEndIdx];\n    var newEndIdx = newCh.length - 1;\n    var newStartVnode = newCh[0];\n    var newEndVnode = newCh[newEndIdx];\n    var oldKeyToIdx, idxInOld, elmToMove, before;\n\n    while (oldStartIdx <= oldEndIdx && newStartIdx <= newEndIdx) {\n      if (isUndef(oldStartVnode)) {\n        oldStartVnode = oldCh[++oldStartIdx]; // Vnode has been moved left\n      } else if (isUndef(oldEndVnode)) {\n        oldEndVnode = oldCh[--oldEndIdx];\n      } else if (sameVnode(oldStartVnode, newStartVnode)) {\n        patchVnode(oldStartVnode, newStartVnode, insertedVnodeQueue);\n        oldStartVnode = oldCh[++oldStartIdx];\n        newStartVnode = newCh[++newStartIdx];\n      } else if (sameVnode(oldEndVnode, newEndVnode)) {\n        patchVnode(oldEndVnode, newEndVnode, insertedVnodeQueue);\n        oldEndVnode = oldCh[--oldEndIdx];\n        newEndVnode = newCh[--newEndIdx];\n      } else if (sameVnode(oldStartVnode, newEndVnode)) { // Vnode moved right\n        patchVnode(oldStartVnode, newEndVnode, insertedVnodeQueue);\n        api.insertBefore(parentElm, oldStartVnode.elm, api.nextSibling(oldEndVnode.elm));\n        oldStartVnode = oldCh[++oldStartIdx];\n        newEndVnode = newCh[--newEndIdx];\n      } else if (sameVnode(oldEndVnode, newStartVnode)) { // Vnode moved left\n        patchVnode(oldEndVnode, newStartVnode, insertedVnodeQueue);\n        api.insertBefore(parentElm, oldEndVnode.elm, oldStartVnode.elm);\n        oldEndVnode = oldCh[--oldEndIdx];\n        newStartVnode = newCh[++newStartIdx];\n      } else {\n        if (isUndef(oldKeyToIdx)) oldKeyToIdx = createKeyToOldIdx(oldCh, oldStartIdx, oldEndIdx);\n        idxInOld = oldKeyToIdx[newStartVnode.key];\n        if (isUndef(idxInOld)) { // New element\n          api.insertBefore(parentElm, createElm(newStartVnode, insertedVnodeQueue), oldStartVnode.elm);\n          newStartVnode = newCh[++newStartIdx];\n        } else {\n          elmToMove = oldCh[idxInOld];\n          patchVnode(elmToMove, newStartVnode, insertedVnodeQueue);\n          oldCh[idxInOld] = undefined;\n          api.insertBefore(parentElm, elmToMove.elm, oldStartVnode.elm);\n          newStartVnode = newCh[++newStartIdx];\n        }\n      }\n    }\n    if (oldStartIdx > oldEndIdx) {\n      before = isUndef(newCh[newEndIdx+1]) ? null : newCh[newEndIdx+1].elm;\n      addVnodes(parentElm, before, newCh, newStartIdx, newEndIdx, insertedVnodeQueue);\n    } else if (newStartIdx > newEndIdx) {\n      removeVnodes(parentElm, oldCh, oldStartIdx, oldEndIdx);\n    }\n  }\n\n  function patchVnode(oldVnode, vnode, insertedVnodeQueue) {\n    var i, hook;\n    if (isDef(i = vnode.data) && isDef(hook = i.hook) && isDef(i = hook.prepatch)) {\n      i(oldVnode, vnode);\n    }\n    var elm = vnode.elm = oldVnode.elm, oldCh = oldVnode.children, ch = vnode.children;\n    if (oldVnode === vnode) return;\n    if (!sameVnode(oldVnode, vnode)) {\n      var parentElm = api.parentNode(oldVnode.elm);\n      elm = createElm(vnode, insertedVnodeQueue);\n      api.insertBefore(parentElm, elm, oldVnode.elm);\n      removeVnodes(parentElm, [oldVnode], 0, 0);\n      return;\n    }\n    if (isDef(vnode.data)) {\n      for (i = 0; i < cbs.update.length; ++i) cbs.update[i](oldVnode, vnode);\n      i = vnode.data.hook;\n      if (isDef(i) && isDef(i = i.update)) i(oldVnode, vnode);\n    }\n    if (isUndef(vnode.text)) {\n      if (isDef(oldCh) && isDef(ch)) {\n        if (oldCh !== ch) updateChildren(elm, oldCh, ch, insertedVnodeQueue);\n      } else if (isDef(ch)) {\n        if (isDef(oldVnode.text)) api.setTextContent(elm, '');\n        addVnodes(elm, null, ch, 0, ch.length - 1, insertedVnodeQueue);\n      } else if (isDef(oldCh)) {\n        removeVnodes(elm, oldCh, 0, oldCh.length - 1);\n      } else if (isDef(oldVnode.text)) {\n        api.setTextContent(elm, '');\n      }\n    } else if (oldVnode.text !== vnode.text) {\n      api.setTextContent(elm, vnode.text);\n    }\n    if (isDef(hook) && isDef(i = hook.postpatch)) {\n      i(oldVnode, vnode);\n    }\n  }\n\n  return function(oldVnode, vnode) {\n    var i, elm, parent;\n    var insertedVnodeQueue = [];\n    for (i = 0; i < cbs.pre.length; ++i) cbs.pre[i]();\n\n    if (isUndef(oldVnode.sel)) {\n      oldVnode = emptyNodeAt(oldVnode);\n    }\n\n    if (sameVnode(oldVnode, vnode)) {\n      patchVnode(oldVnode, vnode, insertedVnodeQueue);\n    } else {\n      elm = oldVnode.elm;\n      parent = api.parentNode(elm);\n\n      createElm(vnode, insertedVnodeQueue);\n\n      if (parent !== null) {\n        api.insertBefore(parent, vnode.elm, api.nextSibling(elm));\n        removeVnodes(parent, [oldVnode], 0, 0);\n      }\n    }\n\n    for (i = 0; i < insertedVnodeQueue.length; ++i) {\n      insertedVnodeQueue[i].data.hook.insert(insertedVnodeQueue[i]);\n    }\n    for (i = 0; i < cbs.post.length; ++i) cbs.post[i]();\n    return vnode;\n  };\n}\n\nmodule.exports = {init: init};\n"]}
require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({"snabbdom/modules/props":[function(require,module,exports){
function updateProps(oldVnode, vnode) {
  var key, cur, old, elm = vnode.elm,
      oldProps = oldVnode.data.props, props = vnode.data.props;

  if (!oldProps && !props) return;
  oldProps = oldProps || {};
  props = props || {};

  for (key in oldProps) {
    if (!props[key]) {
      delete elm[key];
    }
  }
  for (key in props) {
    cur = props[key];
    old = oldProps[key];
    if (old !== cur && (key !== 'value' || elm[key] !== cur)) {
      elm[key] = cur;
    }
  }
}

module.exports = {create: updateProps, update: updateProps};

},{}]},{},[])
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require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({"snabbdom/modules/style":[function(require,module,exports){
var raf = (typeof window !== 'undefined' && window.requestAnimationFrame) || setTimeout;
var nextFrame = function(fn) { raf(function() { raf(fn); }); };

function setNextFrame(obj, prop, val) {
  nextFrame(function() { obj[prop] = val; });
}

function updateStyle(oldVnode, vnode) {
  var cur, name, elm = vnode.elm,
      oldStyle = oldVnode.data.style,
      style = vnode.data.style;

  if (!oldStyle && !style) return;
  oldStyle = oldStyle || {};
  style = style || {};
  var oldHasDel = 'delayed' in oldStyle;

  for (name in oldStyle) {
    if (!style[name]) {
      elm.style[name] = '';
    }
  }
  for (name in style) {
    cur = style[name];
    if (name === 'delayed') {
      for (name in style.delayed) {
        cur = style.delayed[name];
        if (!oldHasDel || cur !== oldStyle.delayed[name]) {
          setNextFrame(elm.style, name, cur);
        }
      }
    } else if (name !== 'remove' && cur !== oldStyle[name]) {
      elm.style[name] = cur;
    }
  }
}

function applyDestroyStyle(vnode) {
  var style, name, elm = vnode.elm, s = vnode.data.style;
  if (!s || !(style = s.destroy)) return;
  for (name in style) {
    elm.style[name] = style[name];
  }
}

function applyRemoveStyle(vnode, rm) {
  var s = vnode.data.style;
  if (!s || !s.remove) {
    rm();
    return;
  }
  var name, elm = vnode.elm, idx, i = 0, maxDur = 0,
      compStyle, style = s.remove, amount = 0, applied = [];
  for (name in style) {
    applied.push(name);
    elm.style[name] = style[name];
  }
  compStyle = getComputedStyle(elm);
  var props = compStyle['transition-property'].split(', ');
  for (; i < props.length; ++i) {
    if(applied.indexOf(props[i]) !== -1) amount++;
  }
  elm.addEventListener('transitionend', function(ev) {
    if (ev.target === elm) --amount;
    if (amount === 0) rm();
  });
}

module.exports = {create: updateStyle, update: updateStyle, destroy: applyDestroyStyle, remove: applyRemoveStyle};

},{}]},{},[])
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require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({"snabbdom/modules/attributes":[function(require,module,exports){
var booleanAttrs = ["allowfullscreen", "async", "autofocus", "autoplay", "checked", "compact", "controls", "declare",
                "default", "defaultchecked", "defaultmuted", "defaultselected", "defer", "disabled", "draggable",
                "enabled", "formnovalidate", "hidden", "indeterminate", "inert", "ismap", "itemscope", "loop", "multiple",
                "muted", "nohref", "noresize", "noshade", "novalidate", "nowrap", "open", "pauseonexit", "readonly",
                "required", "reversed", "scoped", "seamless", "selected", "sortable", "spellcheck", "translate",
                "truespeed", "typemustmatch", "visible"];

var booleanAttrsDict = {};
for(var i=0, len = booleanAttrs.length; i < len; i++) {
  booleanAttrsDict[booleanAttrs[i]] = true;
}

function updateAttrs(oldVnode, vnode) {
  var key, cur, old, elm = vnode.elm,
      oldAttrs = oldVnode.data.attrs, attrs = vnode.data.attrs;

  if (!oldAttrs && !attrs) return;
  oldAttrs = oldAttrs || {};
  attrs = attrs || {};

  // update modified attributes, add new attributes
  for (key in attrs) {
    cur = attrs[key];
    old = oldAttrs[key];
    if (old !== cur) {
      // TODO: add support to namespaced attributes (setAttributeNS)
      if(!cur && booleanAttrsDict[key])
        elm.removeAttribute(key);
      else
        elm.setAttribute(key, cur);
    }
  }
  //remove removed attributes
  // use `in` operator since the previous `for` iteration uses it (.i.e. add even attributes with undefined value)
  // the other option is to remove all attributes with value == undefined
  for (key in oldAttrs) {
    if (!(key in attrs)) {
      elm.removeAttribute(key);
    }
  }
}

module.exports = {create: updateAttrs, update: updateAttrs};

},{}]},{},[])
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require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
module.exports = {
  array: Array.isArray,
  primitive: function(s) { return typeof s === 'string' || typeof s === 'number'; },
};

},{}],2:[function(require,module,exports){
module.exports = function(sel, data, children, text, elm) {
  var key = data === undefined ? undefined : data.key;
  return {sel: sel, data: data, children: children,
          text: text, elm: elm, key: key};
};

},{}],"snabbdom/h":[function(require,module,exports){
var VNode = require('./vnode');
var is = require('./is');

function addNS(data, children, sel) {
  data.ns = 'http://www.w3.org/2000/svg';

  if (sel !== 'foreignObject' && children !== undefined) {
    for (var i = 0; i < children.length; ++i) {
      addNS(children[i].data, children[i].children, children[i].sel);
    }
  }
}

module.exports = function h(sel, b, c) {
  var data = {}, children, text, i;
  if (c !== undefined) {
    data = b;
    if (is.array(c)) { children = c; }
    else if (is.primitive(c)) { text = c; }
  } else if (b !== undefined) {
    if (is.array(b)) { children = b; }
    else if (is.primitive(b)) { text = b; }
    else { data = b; }
  }
  if (is.array(children)) {
    for (i = 0; i < children.length; ++i) {
      if (is.primitive(children[i])) children[i] = VNode(undefined, undefined, undefined, children[i]);
    }
  }
  if (sel[0] === 's' && sel[1] === 'v' && sel[2] === 'g') {
    addNS(data, children, sel);
  }
  return VNode(sel, data, children, text, undefined);
};

},{"./is":1,"./vnode":2}]},{},[])
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require=(function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({"hyperscript-helpers":[function(require,module,exports){
'use strict';

Object.defineProperty(exports, '__esModule', {
  value: true
});
var isValidString = function isValidString(param) {
  return typeof param === 'string' && param.length > 0;
};

var startsWith = function startsWith(string, start) {
  return string[0] === start;
};

var isSelector = function isSelector(param) {
  return isValidString(param) && (startsWith(param, '.') || startsWith(param, '#'));
};

var node = function node(h) {
  return function (tagName) {
    return function (first) {
      for (var _len = arguments.length, rest = Array(_len > 1 ? _len - 1 : 0), _key = 1; _key < _len; _key++) {
        rest[_key - 1] = arguments[_key];
      }

      if (isSelector(first)) {
        return h.apply(undefined, [tagName + first].concat(rest));
      } else if (typeof first === 'undefined') {
        return h(tagName);
      } else {
        return h.apply(undefined, [tagName, first].concat(rest));
      }
    };
  };
};

var TAG_NAMES = ['a', 'abbr', 'acronym', 'address', 'applet', 'area', 'article', 'aside', 'audio', 'b', 'base', 'basefont', 'bdi', 'bdo', 'bgsound', 'big', 'blink', 'blockquote', 'body', 'br', 'button', 'canvas', 'caption', 'center', 'cite', 'code', 'col', 'colgroup', 'command', 'content', 'data', 'datalist', 'dd', 'del', 'details', 'dfn', 'dialog', 'dir', 'div', 'dl', 'dt', 'element', 'em', 'embed', 'fieldset', 'figcaption', 'figure', 'font', 'footer', 'form', 'frame', 'frameset', 'h1', 'h2', 'h3', 'h4', 'h5', 'h6', 'head', 'header', 'hgroup', 'hr', 'html', 'i', 'iframe', 'image', 'img', 'input', 'ins', 'isindex', 'kbd', 'keygen', 'label', 'legend', 'li', 'link', 'listing', 'main', 'map', 'mark', 'marquee', 'math', 'menu', 'menuitem', 'meta', 'meter', 'multicol', 'nav', 'nextid', 'nobr', 'noembed', 'noframes', 'noscript', 'object', 'ol', 'optgroup', 'option', 'output', 'p', 'param', 'picture', 'plaintext', 'pre', 'progress', 'q', 'rb', 'rbc', 'rp', 'rt', 'rtc', 'ruby', 's', 'samp', 'script', 'section', 'select', 'shadow', 'small', 'source', 'spacer', 'span', 'strike', 'strong', 'style', 'sub', 'summary', 'sup', 'svg', 'table', 'tbody', 'td', 'template', 'textarea', 'tfoot', 'th', 'thead', 'time', 'title', 'tr', 'track', 'tt', 'u', 'ul', 'var', 'video', 'wbr', 'xmp'];

exports['default'] = function (h) {
  var createTag = node(h);
  var exported = { TAG_NAMES: TAG_NAMES, isSelector: isSelector, createTag: createTag };
  TAG_NAMES.forEach(function (n) {
    exported[n] = createTag(n);
  });
  return exported;
};

module.exports = exports['default'];

},{}]},{},[])
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// Welcome! require() some modules from npm (like you were using browserify)
// and then hit Run Code to run your code on the right side.
// Modules get downloaded from browserify-cdn and bundled in your browser.

let {addIndex, chain, curry, map, range} = require("ramda")
let snabbdom = require("snabbdom")
let h = require("snabbdom/h")
let hh = require("hyperscript-helpers")

let {div, span} = hh(h)

let patch = snabbdom.init([
  require("snabbdom/modules/style"),
  require("snabbdom/modules/attributes"),
  require("snabbdom/modules/props"),
])

let mapi = addIndex(map)
let chaini = addIndex(chain)

let board1 = [
  [["A1", 0], ["B1", 0]],
  [["C1", 0], ["D1", 0]],
]

let board2 = [
  [["A2", 1], ["B2", 0]],
  [["C2", 0], ["D2", 0]],
]

// renderCell :: Cell -> String
let renderCell = curry((i, j, cell) => {
  if (cell[1] == 0) {
    return span(".cell", [ // <-------- updates when child updates WTF???
      span({attrs: {"class": "card", "data-state": 0}}, [cell[0]])
    ])
  } else {
    return span(".cell", [
      span(".card", {attrs: {"data-state": 1}}, [cell[0]])
    ])
  }
})

// renderBoard :: [[Cell]] -> String
let renderBoard = (board) => {
  let rowsM = board.length
  let colsN = board[0] ? board[0].length : 0
  return div(".board",
    chaini((r, i) => mapi((c, j) => renderCell(i, j, c), r), board)
  )
}

let vnode = renderBoard(board1)

let container = document.getElementById("app")

patch(container, vnode)

document.getElementById("button").addEventListener("click", () => {
  let vnode2 = renderBoard(board2)
  patch(vnode, vnode2)
  vnode = vnode2
})
;}, 0)

package.json

{
  "name": "requirebin-sketch",
  "version": "1.0.0",
  "dependencies": {
    "ramda": "0.22.1",
    "snabbdom": "0.5.3",
    "hyperscript-helpers": "3.0.1"
  }
}

page-body.html

<!-- contents of this file will be placed inside the <body> -->
<div id="app"></div>

<button id="button">Do patch</button>

page-head.html

<!-- contents of this file will be placed inside the <head> -->

requirebin.md

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