Group items tagged

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;  };}