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var isBoolean = is('Boolean'),
    isNumber = is('Number'),
    isString = is('String'),
    isObject = is('Object'),
    isArray = is('Array');

function is(type) {
    var fastTypes = ['undefined', 'boolean', 'string', 'number', 'function', 'symbol'];
    if (fastTypes.indexOf(type.toLowerCase()) >= 0) {
        type = type.toLowerCase();

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function partial (fn) {
    var initialArgs = Array.prototype.slice.call(arguments, 1);
    return function () {
        var remainingArgs = Array.prototype.slice.call(arguments);
        return fn.apply({}, initialArgs.concat(remainingArgs));
    }
}

function findIndex(arr, predicate) {
    var i;

bjdixon

function compact(a) {
  return a.reduce(function(memo, x) {
    return x ? memo.concat(x) : memo;
  }, []);
}

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function flatten(a) {
    return a.map(function(val) {
        return (Array.isArray(val)) ? flatten(val) : val;
    });
}

//example usage
var arr = [1, 2, [3, 4], 5, [6, [7, [8]], 9], 10];
var flat = flatten(arr); // [1, 2, 3, 4, 5, 6, 7, 8, 9, 10]

bjdixon

const Queue = () => {
  let array = [];
  
  return {
    push: (value) => array.push(value),
    pull: () => array.shift(),
    isEmpty: () => !array.length
  };
};

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const copyObject = (source) => Object.assign({}, source);

const Stack = () => {
  const array = [];
      
  return {
    push (value) {
      array.push(value);
    },
    pop () {

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memo = function (fn) {
  var cache = {};
  return function () {
    var key = JSON.stringify(this, arguments);
    return cache[key] || (cache[key] = fn.apply(this, arguments));
  }
}

bjdixon

// Kestrel
const K = ( x ) => ( y ) => x;
// Identity
const I = ( x ) => x;
// Vireo
const V = ( x ) => ( y ) => ( z ) => z( x )( z );
// Thrush
const T = ( x ) => ( y ) => y( x ), x;
// Why
const Y = ( x ) => ( ( y ) => y( y ) )( ( y ) => ( x( ( z ) => y( y )( z ) ) ) );

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$._data( $(selector)[0], "events" );

bjdixon

//extend jquery with function to check if element exists
$.fn.exists = function(){
    return this.length > 0 ? this : false;
}

//usage
$('.matchme').exists(); //returns reference to element if exists otherwise false