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August 26, 2010 04:54
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// Underscore.js | |
// (c) 2010 Jeremy Ashkenas, DocumentCloud Inc. | |
// Underscore is freely distributable under the terms of the MIT license. | |
// Portions of Underscore are inspired by or borrowed from Prototype.js, | |
// Oliver Steele's Functional, and John Resig's Micro-Templating. | |
// For all details and documentation: | |
// http://documentcloud.github.com/underscore | |
(function() { | |
// ------------------------- Baseline setup --------------------------------- | |
// Establish the root object, "window" in the browser, or "global" on the server. | |
var root = this; | |
// Save the previous value of the "_" variable. | |
var previousUnderscore = root._; | |
// Establish the object that gets thrown to break out of a loop iteration. | |
var breaker = typeof StopIteration !== 'undefined' ? StopIteration : '__break__'; | |
// Quick regexp-escaping function, because JS doesn't have RegExp.escape(). | |
var escapeRegExp = function(s) { return s.replace(/([.*+?^${}()|[\]\/\\])/g, '\\$1'); }; | |
// Save bytes in the minified (but not gzipped) version: | |
var ArrayProto = Array.prototype, ObjProto = Object.prototype; | |
// Create quick reference variables for speed access to core prototypes. | |
var slice = ArrayProto.slice, | |
unshift = ArrayProto.unshift, | |
toString = ObjProto.toString, | |
hasOwnProperty = ObjProto.hasOwnProperty, | |
propertyIsEnumerable = ObjProto.propertyIsEnumerable; | |
// All ECMA5 native implementations we hope to use are declared here. | |
var | |
nativeForEach = ArrayProto.forEach, | |
nativeMap = ArrayProto.map, | |
nativeReduce = ArrayProto.reduce, | |
nativeReduceRight = ArrayProto.reduceRight, | |
nativeFilter = ArrayProto.filter, | |
nativeEvery = ArrayProto.every, | |
nativeSome = ArrayProto.some, | |
nativeIndexOf = ArrayProto.indexOf, | |
nativeLastIndexOf = ArrayProto.lastIndexOf, | |
nativeIsArray = Array.isArray, | |
nativeKeys = Object.keys; | |
// Create a safe reference to the Underscore object for use below. | |
var _ = function(obj) { return new wrapper(obj); }; | |
// Export the Underscore object for CommonJS. | |
if (typeof exports !== 'undefined') exports._ = _; | |
// Export underscore to global scope. | |
root._ = _; | |
// Current version. | |
_.VERSION = '1.1.0'; | |
// ------------------------ Collection Functions: --------------------------- | |
// The cornerstone, an each implementation. | |
// Handles objects implementing forEach, arrays, and raw objects. | |
// Delegates to JavaScript 1.6's native forEach if available. | |
var each = _.forEach = function(obj, iterator, context) { | |
try { | |
if (nativeForEach && obj.forEach === nativeForEach) { | |
obj.forEach(iterator, context); | |
} else if (_.isNumber(obj.length)) { | |
for (var i = 0, l = obj.length; i < l; i++) iterator.call(context, obj[i], i, obj); | |
} else { | |
for (var key in obj) { | |
if (hasOwnProperty.call(obj, key)) iterator.call(context, obj[key], key, obj); | |
} | |
} | |
} catch(e) { | |
if (e != breaker) throw e; | |
} | |
return obj; | |
}; | |
// Return the results of applying the iterator to each element. | |
// Delegates to JavaScript 1.6's native map if available. | |
_.map = function(obj, iterator, context) { | |
if (nativeMap && obj.map === nativeMap) return obj.map(iterator, context); | |
var results = []; | |
each(obj, function(value, index, list) { | |
results.push(iterator.call(context, value, index, list)); | |
}); | |
return results; | |
}; | |
// Reduce builds up a single result from a list of values, aka inject, or foldl. | |
// Delegates to JavaScript 1.8's native reduce if available. | |
_.reduce = function(obj, iterator, memo, context) { | |
if (nativeReduce && obj.reduce === nativeReduce) { | |
if (context) iterator = _.bind(iterator, context); | |
return obj.reduce(iterator, memo); | |
} | |
each(obj, function(value, index, list) { | |
memo = iterator.call(context, memo, value, index, list); | |
}); | |
return memo; | |
}; | |
// The right-associative version of reduce, also known as foldr. Uses | |
// Delegates to JavaScript 1.8's native reduceRight if available. | |
_.reduceRight = function(obj, iterator, memo, context) { | |
if (nativeReduceRight && obj.reduceRight === nativeReduceRight) { | |
if (context) iterator = _.bind(iterator, context); | |
return obj.reduceRight(iterator, memo); | |
} | |
var reversed = _.clone(_.toArray(obj)).reverse(); | |
return _.reduce(reversed, iterator, memo, context); | |
}; | |
// Return the first value which passes a truth test. | |
_.detect = function(obj, iterator, context) { | |
var result; | |
each(obj, function(value, index, list) { | |
if (iterator.call(context, value, index, list)) { | |
result = value; | |
_.breakLoop(); | |
} | |
}); | |
return result; | |
}; | |
// Return all the elements that pass a truth test. | |
// Delegates to JavaScript 1.6's native filter if available. | |
_.filter = function(obj, iterator, context) { | |
if (nativeFilter && obj.filter === nativeFilter) return obj.filter(iterator, context); | |
var results = []; | |
each(obj, function(value, index, list) { | |
iterator.call(context, value, index, list) && results.push(value); | |
}); | |
return results; | |
}; | |
// Return all the elements for which a truth test fails. | |
_.reject = function(obj, iterator, context) { | |
var results = []; | |
each(obj, function(value, index, list) { | |
!iterator.call(context, value, index, list) && results.push(value); | |
}); | |
return results; | |
}; | |
// Determine whether all of the elements match a truth test. | |
// Delegates to JavaScript 1.6's native every if available. | |
_.every = function(obj, iterator, context) { | |
iterator = iterator || _.identity; | |
if (nativeEvery && obj.every === nativeEvery) return obj.every(iterator, context); | |
var result = true; | |
each(obj, function(value, index, list) { | |
if (!(result = result && iterator.call(context, value, index, list))) _.breakLoop(); | |
}); | |
return result; | |
}; | |
// Determine if at least one element in the object matches a truth test. | |
// Delegates to JavaScript 1.6's native some if available. | |
_.some = function(obj, iterator, context) { | |
iterator = iterator || _.identity; | |
if (nativeSome && obj.some === nativeSome) return obj.some(iterator, context); | |
var result = false; | |
each(obj, function(value, index, list) { | |
if (result = iterator.call(context, value, index, list)) _.breakLoop(); | |
}); | |
return result; | |
}; | |
// Determine if a given value is included in the array or object using '==='. | |
_.include = function(obj, target) { | |
if (nativeIndexOf && obj.indexOf === nativeIndexOf) return obj.indexOf(target) != -1; | |
var found = false; | |
each(obj, function(value) { | |
if (found = value === target) _.breakLoop(); | |
}); | |
return found; | |
}; | |
// Invoke a method with arguments on every item in a collection. | |
_.invoke = function(obj, method) { | |
var args = _.rest(arguments, 2); | |
return _.map(obj, function(value) { | |
return (method ? value[method] : value).apply(value, args); | |
}); | |
}; | |
// Convenience version of a common use case of map: fetching a property. | |
_.pluck = function(obj, key) { | |
return _.map(obj, function(value){ return value[key]; }); | |
}; | |
// Return the maximum item or (item-based computation). | |
_.max = function(obj, iterator, context) { | |
if (!iterator && _.isArray(obj)) return Math.max.apply(Math, obj); | |
var result = {computed : -Infinity}; | |
each(obj, function(value, index, list) { | |
var computed = iterator ? iterator.call(context, value, index, list) : value; | |
computed >= result.computed && (result = {value : value, computed : computed}); | |
}); | |
return result.value; | |
}; | |
// Return the minimum element (or element-based computation). | |
_.min = function(obj, iterator, context) { | |
if (!iterator && _.isArray(obj)) return Math.min.apply(Math, obj); | |
var result = {computed : Infinity}; | |
each(obj, function(value, index, list) { | |
var computed = iterator ? iterator.call(context, value, index, list) : value; | |
computed < result.computed && (result = {value : value, computed : computed}); | |
}); | |
return result.value; | |
}; | |
// Sort the object's values by a criterion produced by an iterator. | |
_.sortBy = function(obj, iterator, context) { | |
return _.pluck(_.map(obj, function(value, index, list) { | |
return { | |
value : value, | |
criteria : iterator.call(context, value, index, list) | |
}; | |
}).sort(function(left, right) { | |
var a = left.criteria, b = right.criteria; | |
return a < b ? -1 : a > b ? 1 : 0; | |
}), 'value'); | |
}; | |
// Use a comparator function to figure out at what index an object should | |
// be inserted so as to maintain order. Uses binary search. | |
_.sortedIndex = function(array, obj, iterator) { | |
iterator = iterator || _.identity; | |
var low = 0, high = array.length; | |
while (low < high) { | |
var mid = (low + high) >> 1; | |
iterator(array[mid]) < iterator(obj) ? low = mid + 1 : high = mid; | |
} | |
return low; | |
}; | |
// Convert anything iterable into a real, live array. | |
_.toArray = function(iterable) { | |
if (!iterable) return []; | |
if (iterable.toArray) return iterable.toArray(); | |
if (_.isArray(iterable)) return iterable; | |
if (_.isArguments(iterable)) return slice.call(iterable); | |
return _.values(iterable); | |
}; | |
// Return the number of elements in an object. | |
_.size = function(obj) { | |
return _.toArray(obj).length; | |
}; | |
// -------------------------- Array Functions: ------------------------------ | |
// Get the first element of an array. Passing "n" will return the first N | |
// values in the array. Aliased as "head". The "guard" check allows it to work | |
// with _.map. | |
_.first = function(array, n, guard) { | |
return n && !guard ? slice.call(array, 0, n) : array[0]; | |
}; | |
// Returns everything but the first entry of the array. Aliased as "tail". | |
// Especially useful on the arguments object. Passing an "index" will return | |
// the rest of the values in the array from that index onward. The "guard" | |
//check allows it to work with _.map. | |
_.rest = function(array, index, guard) { | |
return slice.call(array, _.isUndefined(index) || guard ? 1 : index); | |
}; | |
// Get the last element of an array. | |
_.last = function(array) { | |
return array[array.length - 1]; | |
}; | |
// Trim out all falsy values from an array. | |
_.compact = function(array) { | |
return _.filter(array, function(value){ return !!value; }); | |
}; | |
// Return a completely flattened version of an array. | |
_.flatten = function(array) { | |
return _.reduce(array, function(memo, value) { | |
if (_.isArray(value)) return memo.concat(_.flatten(value)); | |
memo.push(value); | |
return memo; | |
}, []); | |
}; | |
// Return a version of the array that does not contain the specified value(s). | |
_.without = function(array) { | |
var values = _.rest(arguments); | |
return _.filter(array, function(value){ return !_.include(values, value); }); | |
}; | |
// Produce a duplicate-free version of the array. If the array has already | |
// been sorted, you have the option of using a faster algorithm. | |
_.uniq = function(array, isSorted) { | |
return _.reduce(array, function(memo, el, i) { | |
if (0 == i || (isSorted === true ? _.last(memo) != el : !_.include(memo, el))) memo.push(el); | |
return memo; | |
}, []); | |
}; | |
// Produce an array that contains every item shared between all the | |
// passed-in arrays. | |
_.intersect = function(array) { | |
var rest = _.rest(arguments); | |
return _.filter(_.uniq(array), function(item) { | |
return _.every(rest, function(other) { | |
return _.indexOf(other, item) >= 0; | |
}); | |
}); | |
}; | |
// Zip together multiple lists into a single array -- elements that share | |
// an index go together. | |
_.zip = function() { | |
var args = _.toArray(arguments); | |
var length = _.max(_.pluck(args, 'length')); | |
var results = new Array(length); | |
for (var i = 0; i < length; i++) results[i] = _.pluck(args, String(i)); | |
return results; | |
}; | |
// If the browser doesn't supply us with indexOf (I'm looking at you, MSIE), | |
// we need this function. Return the position of the first occurence of an | |
// item in an array, or -1 if the item is not included in the array. | |
// Delegates to JavaScript 1.8's native indexOf if available. | |
_.indexOf = function(array, item) { | |
if (nativeIndexOf && array.indexOf === nativeIndexOf) return array.indexOf(item); | |
for (var i = 0, l = array.length; i < l; i++) if (array[i] === item) return i; | |
return -1; | |
}; | |
// Delegates to JavaScript 1.6's native lastIndexOf if available. | |
_.lastIndexOf = function(array, item) { | |
if (nativeLastIndexOf && array.lastIndexOf === nativeLastIndexOf) return array.lastIndexOf(item); | |
var i = array.length; | |
while (i--) if (array[i] === item) return i; | |
return -1; | |
}; | |
// Generate an integer Array containing an arithmetic progression. A port of | |
// the native Python range() function. See: | |
// http://docs.python.org/library/functions.html#range | |
_.range = function(start, stop, step) { | |
var a = _.toArray(arguments); | |
var solo = a.length <= 1; | |
var start = solo ? 0 : a[0], stop = solo ? a[0] : a[1], step = a[2] || 1; | |
var len = Math.ceil((stop - start) / step); | |
if (len <= 0) return []; | |
var range = new Array(len); | |
for (var i = start, idx = 0; true; i += step) { | |
if ((step > 0 ? i - stop : stop - i) >= 0) return range; | |
range[idx++] = i; | |
} | |
}; | |
// ----------------------- Function Functions: ------------------------------ | |
// Create a function bound to a given object (assigning 'this', and arguments, | |
// optionally). Binding with arguments is also known as 'curry'. | |
_.bind = function(func, obj) { | |
var args = _.rest(arguments, 2); | |
return function() { | |
return func.apply(obj || {}, args.concat(_.toArray(arguments))); | |
}; | |
}; | |
// Bind all of an object's methods to that object. Useful for ensuring that | |
// all callbacks defined on an object belong to it. | |
_.bindAll = function(obj) { | |
var funcs = _.rest(arguments); | |
if (funcs.length == 0) funcs = _.functions(obj); | |
each(funcs, function(f) { obj[f] = _.bind(obj[f], obj); }); | |
return obj; | |
}; | |
// Memoize an expensive function by storing its results. | |
_.memoize = function(func, hasher) { | |
var memo = {}; | |
hasher = hasher || _.identity; | |
return function() { | |
var key = hasher.apply(this, arguments); | |
return key in memo ? memo[key] : (memo[key] = func.apply(this, arguments)); | |
}; | |
}; | |
// Delays a function for the given number of milliseconds, and then calls | |
// it with the arguments supplied. | |
_.delay = function(func, wait) { | |
var args = _.rest(arguments, 2); | |
return setTimeout(function(){ return func.apply(func, args); }, wait); | |
}; | |
// Defers a function, scheduling it to run after the current call stack has | |
// cleared. | |
_.defer = function(func) { | |
return _.delay.apply(_, [func, 1].concat(_.rest(arguments))); | |
}; | |
// Returns the first function passed as an argument to the second, | |
// allowing you to adjust arguments, run code before and after, and | |
// conditionally execute the original function. | |
_.wrap = function(func, wrapper) { | |
return function() { | |
var args = [func].concat(_.toArray(arguments)); | |
return wrapper.apply(wrapper, args); | |
}; | |
}; | |
// Returns a function that is the composition of a list of functions, each | |
// consuming the return value of the function that follows. | |
_.compose = function() { | |
var funcs = _.toArray(arguments); | |
return function() { | |
var args = _.toArray(arguments); | |
for (var i=funcs.length-1; i >= 0; i--) { | |
args = [funcs[i].apply(this, args)]; | |
} | |
return args[0]; | |
}; | |
}; | |
// ------------------------- Object Functions: ------------------------------ | |
// Retrieve the names of an object's properties. | |
// Delegates to ECMA5's native Object.keys | |
_.keys = nativeKeys || function(obj) { | |
if (_.isArray(obj)) return _.range(0, obj.length); | |
var keys = []; | |
for (var key in obj) if (hasOwnProperty.call(obj, key)) keys.push(key); | |
return keys; | |
}; | |
// Retrieve the values of an object's properties. | |
_.values = function(obj) { | |
return _.map(obj, _.identity); | |
}; | |
// Return a sorted list of the function names available on the object. | |
_.functions = function(obj) { | |
return _.filter(_.keys(obj), function(key){ return _.isFunction(obj[key]); }).sort(); | |
}; | |
// Extend a given object with all the properties in passed-in object(s). | |
_.extend = function(obj) { | |
each(_.rest(arguments), function(source) { | |
for (var prop in source) obj[prop] = source[prop]; | |
}); | |
return obj; | |
}; | |
// Create a (shallow-cloned) duplicate of an object. | |
_.clone = function(obj) { | |
if (_.isArray(obj)) return obj.slice(0); | |
return _.extend({}, obj); | |
}; | |
// Invokes interceptor with the obj, and then returns obj. | |
// The primary purpose of this method is to "tap into" a method chain, in order to perform operations on intermediate results within the chain. | |
_.tap = function(obj, interceptor) { | |
interceptor(obj); | |
return obj; | |
}; | |
// Perform a deep comparison to check if two objects are equal. | |
_.isEqual = function(a, b) { | |
// Check object identity. | |
if (a === b) return true; | |
// Different types? | |
var atype = typeof(a), btype = typeof(b); | |
if (atype != btype) return false; | |
// Basic equality test (watch out for coercions). | |
if (a == b) return true; | |
// One is falsy and the other truthy. | |
if ((!a && b) || (a && !b)) return false; | |
// One of them implements an isEqual()? | |
if (a.isEqual) return a.isEqual(b); | |
// Check dates' integer values. | |
if (_.isDate(a) && _.isDate(b)) return a.getTime() === b.getTime(); | |
// Both are NaN? | |
if (_.isNaN(a) && _.isNaN(b)) return false; | |
// Compare regular expressions. | |
if (_.isRegExp(a) && _.isRegExp(b)) | |
return a.source === b.source && | |
a.global === b.global && | |
a.ignoreCase === b.ignoreCase && | |
a.multiline === b.multiline; | |
// If a is not an object by this point, we can't handle it. | |
if (atype !== 'object') return false; | |
// Check for different array lengths before comparing contents. | |
if (a.length && (a.length !== b.length)) return false; | |
// Nothing else worked, deep compare the contents. | |
var aKeys = _.keys(a), bKeys = _.keys(b); | |
// Different object sizes? | |
if (aKeys.length != bKeys.length) return false; | |
// Recursive comparison of contents. | |
for (var key in a) if (!(key in b) || !_.isEqual(a[key], b[key])) return false; | |
return true; | |
}; | |
// Is a given array or object empty? | |
_.isEmpty = function(obj) { | |
if (_.isArray(obj) || _.isString(obj)) return obj.length === 0; | |
for (var key in obj) if (hasOwnProperty.call(obj, key)) return false; | |
return true; | |
}; | |
// Is a given value a DOM element? | |
_.isElement = function(obj) { | |
return !!(obj && obj.nodeType == 1); | |
}; | |
// Is a given value an array? | |
// Delegates to ECMA5's native Array.isArray | |
_.isArray = nativeIsArray || function(obj) { | |
return !!(obj && obj.concat && obj.unshift && !obj.callee); | |
}; | |
// Is a given variable an arguments object? | |
_.isArguments = function(obj) { | |
return obj && obj.callee; | |
}; | |
// Is a given value a function? | |
_.isFunction = function(obj) { | |
return !!(obj && obj.constructor && obj.call && obj.apply); | |
}; | |
// Is a given value a string? | |
_.isString = function(obj) { | |
return !!(obj === '' || (obj && obj.charCodeAt && obj.substr)); | |
}; | |
// Is a given value a number? | |
_.isNumber = function(obj) { | |
return (obj === +obj) || (toString.call(obj) === '[object Number]'); | |
}; | |
// Is a given value a boolean? | |
_.isBoolean = function(obj) { | |
return obj === true || obj === false; | |
}; | |
// Is a given value a date? | |
_.isDate = function(obj) { | |
return !!(obj && obj.getTimezoneOffset && obj.setUTCFullYear); | |
}; | |
// Is the given value a regular expression? | |
_.isRegExp = function(obj) { | |
return !!(obj && obj.test && obj.exec && (obj.ignoreCase || obj.ignoreCase === false)); | |
}; | |
// Is the given value NaN -- this one is interesting. NaN != NaN, and | |
// isNaN(undefined) == true, so we make sure it's a number first. | |
_.isNaN = function(obj) { | |
return _.isNumber(obj) && isNaN(obj); | |
}; | |
// Is a given value equal to null? | |
_.isNull = function(obj) { | |
return obj === null; | |
}; | |
// Is a given variable undefined? | |
_.isUndefined = function(obj) { | |
return typeof obj == 'undefined'; | |
}; | |
// -------------------------- Utility Functions: ---------------------------- | |
// Run Underscore.js in noConflict mode, returning the '_' variable to its | |
// previous owner. Returns a reference to the Underscore object. | |
_.noConflict = function() { | |
root._ = previousUnderscore; | |
return this; | |
}; | |
// Keep the identity function around for default iterators. | |
_.identity = function(value) { | |
return value; | |
}; | |
// Run a function n times. | |
_.times = function (n, iterator, context) { | |
for (var i = 0; i < n; i++) iterator.call(context, i); | |
}; | |
// Break out of the middle of an iteration. | |
_.breakLoop = function() { | |
throw breaker; | |
}; | |
// Add your own custom functions to the Underscore object, ensuring that | |
// they're correctly added to the OOP wrapper as well. | |
_.mixin = function(obj) { | |
each(_.functions(obj), function(name){ | |
addToWrapper(name, _[name] = obj[name]); | |
}); | |
}; | |
// Generate a unique integer id (unique within the entire client session). | |
// Useful for temporary DOM ids. | |
var idCounter = 0; | |
_.uniqueId = function(prefix) { | |
var id = idCounter++; | |
return prefix ? prefix + id : id; | |
}; | |
// By default, Underscore uses ERB-style template delimiters, change the | |
// following template settings to use alternative delimiters. | |
_.templateSettings = { | |
start : '<%', | |
end : '%>', | |
interpolate : /<%=(.+?)%>/g | |
}; | |
// JavaScript templating a-la ERB, pilfered from John Resig's | |
// "Secrets of the JavaScript Ninja", page 83. | |
// Single-quote fix from Rick Strahl's version. | |
// With alterations for arbitrary delimiters, and to preserve whitespace. | |
_.template = function(str, data) { | |
var c = _.templateSettings; | |
var endMatch = new RegExp("'(?=[^"+c.end.substr(0, 1)+"]*"+escapeRegExp(c.end)+")","g"); | |
var fn = new Function('obj', | |
'var p=[];' + | |
'with(obj||{}){p.push(\'' + | |
str.replace(/\r/g, '\\r') | |
.replace(/\n/g, '\\n') | |
.replace(/\t/g, '\\t') | |
.replace(endMatch,"✄") | |
.split("'").join("\\'") | |
.split("✄").join("'") | |
.replace(c.interpolate, "' + $1 + '") | |
.split(c.start).join("');") | |
.split(c.end).join("p.push('") | |
+ "');}return p.join('');"); | |
return data ? fn(data) : fn; | |
}; | |
// ------------------------------- Aliases ---------------------------------- | |
_.each = _.forEach; | |
_.foldl = _.inject = _.reduce; | |
_.foldr = _.reduceRight; | |
_.select = _.filter; | |
_.all = _.every; | |
_.any = _.some; | |
_.contains = _.include; | |
_.head = _.first; | |
_.tail = _.rest; | |
_.methods = _.functions; | |
// ------------------------ Setup the OOP Wrapper: -------------------------- | |
// If Underscore is called as a function, it returns a wrapped object that | |
// can be used OO-style. This wrapper holds altered versions of all the | |
// underscore functions. Wrapped objects may be chained. | |
var wrapper = function(obj) { this._wrapped = obj; }; | |
// Helper function to continue chaining intermediate results. | |
var result = function(obj, chain) { | |
return chain ? _(obj).chain() : obj; | |
}; | |
// A method to easily add functions to the OOP wrapper. | |
var addToWrapper = function(name, func) { | |
wrapper.prototype[name] = function() { | |
var args = _.toArray(arguments); | |
unshift.call(args, this._wrapped); | |
return result(func.apply(_, args), this._chain); | |
}; | |
}; | |
// Add all of the Underscore functions to the wrapper object. | |
_.mixin(_); | |
// Add all mutator Array functions to the wrapper. | |
each(['pop', 'push', 'reverse', 'shift', 'sort', 'splice', 'unshift'], function(name) { | |
var method = ArrayProto[name]; | |
wrapper.prototype[name] = function() { | |
method.apply(this._wrapped, arguments); | |
return result(this._wrapped, this._chain); | |
}; | |
}); | |
// Add all accessor Array functions to the wrapper. | |
each(['concat', 'join', 'slice'], function(name) { | |
var method = ArrayProto[name]; | |
wrapper.prototype[name] = function() { | |
return result(method.apply(this._wrapped, arguments), this._chain); | |
}; | |
}); | |
// Start chaining a wrapped Underscore object. | |
wrapper.prototype.chain = function() { | |
this._chain = true; | |
return this; | |
}; | |
// Extracts the result from a wrapped and chained object. | |
wrapper.prototype.value = function() { | |
return this._wrapped; | |
}; | |
})(); |
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