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I added a function to Object.prototype using Object.prototype.func = function () {...} but when I try to call it using Object.func() it throws an error that it is not defined in Object.
Everything in JavaScript is an object and inherits from Object (including Object). If there’s a property on Object.prototype then EVERYTHING can access it because it is in everything’s prototype.
http://jsfiddle.net/PxLDu/1/