Array.filter()
Pushes support back to at least IE6.
/**
* Array.filter() polyfill
*/
// From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Array/filter
if (!Array.prototype.filter)
Array.prototype.filter = function(func, thisArg) {
'use strict';
if ( ! ((typeof func === 'Function' || typeof func === 'function') && this) )
throw new TypeError();
var len = this.length >>> 0,
res = new Array(len), // preallocate array
t = this, c = 0, i = -1;
if (thisArg === undefined)
while (++i !== len)
// checks to see if the key was set
if (i in this)
if (func(t[i], i, t))
res[c++] = t[i];
else
while (++i !== len)
// checks to see if the key was set
if (i in this)
if (func.call(thisArg, t[i], i, t))
res[c++] = t[i];
res.length = c; // shrink down array to proper size
return res;
};