Parametric Polymorphism (Generic Programming) not supported in Javascript?

I cannot f开发者_开发百科ind any information on Generic Programming in Javascript. So I assume it is not supported. Is it true? Is there anything that comes close?

Parametric Polymorphism http://en.wikipedia.org/wiki/Parametric_polymorphism

Generic Programming http://en.wikipedia.org/wiki/Generic_programming

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JavaScript is dynamically duck typed. Generics don't make sense in that context. There aren't static types. It being supported or not is nonsensical.

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Are you looking for something like:

var fn = function<T>(p1) {
    var elmt = document.getElementById(typeof(T).toString());
    [...]
}

I think that's is not supported by JavaScript/ECMA-262: ECMAScript specification.

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You may want to take a look at this JavaScript generic type implementation.