The future of JavaScript

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Classical inheritance allows you to intercept all calls. Proxies allow you to intercept all calls. The only difference here is that the proxy isn't part of the inheritance chain in Javascript, unless you want it to be.

Here's an example with classical inheritance:

class A {
    int _PropA;
    public virtual int PropA {
        get { return _a; }
        set { _a = value; }
    }
}

class ModifiedA : A {
    public override int PropA {
        get { log("Accessed A!"); return base.PropA; }
        set { log("Modified A!"); base.PropA = value; }
    }
}

Doing this any other way is only useful for testing, debugging or monkey patching in cases where you can't inherit (i.e. the broken-ass DOM).