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You want one instance to inherit the private state of another instance? Sure you can do this in JavaScript. First we need to define a utility function: <pre><code>function weakBind(functable, prototype, state) { return function () { return functable.apply(this, Object.getPrototypeOf(this) === prototype ? [state].concat(Array.prototype.slice.call(arguments)) : arguments); }; } </code></pre> Now we can create our base class as follows: <pre><code>var Dog = (function () { function Dog() { if (this instanceof Dog) { // constructor code } else return Object.create(private); } var public = Dog.prototype, private = Object.create(public, { size: { value: "big" } }); public.saySize = weakBind(function (private) { return "I am a " + private.size + " dog."; }, public, private); return Dog; }()); </code></pre> Now you can create a dog as follows: <pre><code>var dog = new Dog; alert(dog.saySize()); // I am a big dog. alert(dog.size); // undefined </code></pre> We can inherit the private state as follows: <pre><code>var Chihuahua = (function () { function Chihuahua() { Dog.call(this); } var private = Dog(); Object.defineProperty(private, { size: { value: "small" } }); var public = Chihuahua.prototype = Object.create(Dog.prototype); public.saySize = weakBind(public.saySize, public, private); return Chihuahua; }()); </code></pre> Now you can create a chihuahua as follows: <pre><code>var chi = new Chihuahua; alert(chi.saySize()); // I am a small dog. alert(chi.size); // undefined </code></pre> See the demo: <a href="http://jsfiddle.net/b3Eyn/" rel="nofollow">http://jsfiddle.net/b3Eyn/</a> Note: I wrote this answer just to show that it's possible to inherit private state in JavaScript. However I would advise you not to use this pattern. If you design your code well then you won't need to inherit private state in the first place.
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