dshaw

// From @jeresig
// http://ejohn.org/apps/learn/#15
var ninja = { 
  yell: function(n){ 
    return n > 0 ? arguments.callee(n-1) + "a" : "hiy"; 
  } 
}; 
assert( ninja.yell(4) == "hiyaaaa", "arguments.callee is the function itself." );

dshaw

// From @jeresig
// http://ejohn.org/apps/learn/#2
// The .bind method from Prototype.js
Function.prototype.bind = function(){
  var fn = this, args = Array.prototype.slice.call(arguments), object = args.shift();
  return function(){
    return fn.apply(object,
      args.concat(Array.prototype.slice.call(arguments)));
  };
};

dshaw

// from http://twitter.com/javascripts/widgets/widget.js
if(!Array.forEach){Array.prototype.forEach=function(D,E){var C=E||window;for(var B=0,A=this.length;B<A;++B){D.call(C,this[B],B,this)}};

dshaw

// from http://twitter.com/javascripts/widgets/widget.js
if(!"console" in window){window.console={log:function(){}}}

dshaw

var each = [].forEach || function (fn) {
  var len = this.length || 0, that = arguments[1];
  if (typeof fn == 'function') {
    for (var i = 0; i < len; i++) {
      fn.call(that, this[i], i, this);
    }
  }
};

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

// Check to make sure indexOf is implemented (!!IE6).
if (!Array.indexOf) {
  Array.prototype.indexOf = function(elem) {
    var i=0,
        length=this.length;
    for (; i < length; i++) {
        if (this[i] === elem ) {
          return i;
        }
    }

dshaw

function isDate(str) {
  return (Object.prototype.toString.call(new Date(str)) === "[object Date]");
}

dshaw

var scrollTop = Math.max(doc.documentElement.scrollTop, doc.body.scrollTop);

dshaw

// From @codepo8
// http://www.smashingmagazine.com/2010/04/20/seven-javascript-things-i-wish-i-knew-much-earlier-in-my-career/

// Take the list of class attributes on an element and add new class.
function addclass(elm,newclass){
  var classes = elm.className.split(' ');
  classes.push(newclass);
  elm.className = classes.join(' ');
}