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Can somebody please tell me what || this doing here
(function()
{
window.myapp = window.myapp || {};
window.myapp.lang = window.myapp.lang || {};
myapp.lang.Extend = function(subClass, superClass)
{
subClass.prototype = new superClass();
};
})();
It means: create window.myapp as an empty object if it does not already exist.