Singletons of EXTJS

Otherwise known as the module design pattern this pattern allows you to create private JS Variables or methods through the clever use of closures. The singleton is a good pattern to use when you you have a class of static methods, or you have a class that will only be used once. A good candidate for a singleton is the entry point into your application.

MyApp = function(){
    var data; data is private and can't be accessed from outside.
    return {
        init: function(){
            // Initialize application here
        },
        
        getData: function(){
            return data;
        }
    };
}();
Ext.onReady(MyApp.init, MyApp);