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window.localStorage is not null # window.localStorage === !null
window.localStorage isnt null   # window.localStorage !== null

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// This is a fairly common pattern. First, define a constructor...
var Person = function(firstName, lastName) {
  this.firstName = firstName;
  this.lastName = lastName;
};

// ...then define some methods by mixing into the prototype
$.extend(Person.prototype, {
  sayHello: function() {
    console.log('Hello, I\'m ' + this.getFullName());

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var shuffle = function(source) {
	var ret = Array.prototype.slice.call(source),
		len = source.length,
		i = len,
		rand, temp;
	
	while (i--) {
	 	rand = parseInt( Math.random() * len, 10 );
		temp = ret[ i ];
  		ret[ i ] = ret[ rand ];

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// jQuery UI sugar: an easy way to limit a plugin generated by the widget
// factory down to the first element. This is useful for widgets like dialog
// and mediaplayer that should be instantiated/configured individually.
$.widget.singularize = function(widgetName) {
	// Keep a reference to the auto-generated plugin, so that we can use it later
	var widget = $.fn[ widgetName ],
		slice = Array.prototype.slice;
		
	// Abort is widget doesn't exist to avoid creating random properties on $.fn
	if (!widget || !($.isFunction(widget))) {

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var isIDevice = navigator.platform.toLowerCase() in {
	"ipod": true,
	"ipad": true,
	"iphone": true
};