I cannot find 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
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.