if (!Array.prototype.map) { Array.prototype.map = function(fun /*, thisp*/) { var len = this.length >>> 0; // make sure length is a positive number if (typeof fun != "function") // make sure the first argument is a function throw new TypeError(); var res = new Array(len); // initialize the resulting array var thisp = arguments[1]; // an optional 'context' argument for (var i = 0; i < len; i++) { if (i in this) res[i] = fun.call(thisp, this[i], i, this); // fill the resulting array } return res; };}