dshaw

/*
 *    Copyright (c) 2010 Tobias Schneider
 *    This script is freely distributable under the terms of the MIT license.
 */

(function(){
    var UPC_SET = {
        "3211": '0',
        "2221": '1',
        "2122": '2',

dshaw

var performance = (function () {
	var my = {};
	
	// Wrap a function body in this to return a copy that instruments itself
	// If you want this to be useful, you should give your profiled function a name,
	// otherwise it will be identified as "", which is less than useful.
	my.profile = function (func) {
		return function () {
			var start = new Date().getTime(),
				time,

dshaw

// everyone's new favorite closure pattern:
(function(window,document,undefined){ ... })(this,this.document);

// when minified:
(function(w,d,u){ ... })(this,this.document);

// which means all uses of window/document/undefined inside the closure 
// will be single-lettered, so big gains in minification.

// it also will speed up scope chain traversal a tiny tiny little bit.

dshaw

setInterval((function () {
  console.log(new Date()); // run some arbitrary code
  return arguments.callee; // here be the magic
})(), 1000);
// ^---- and that runs the function, and the return val is assign to the interval