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John Resig of Mozilla and jQuery fame has a very interesting post about method overloading in JavsScript. In a nutshell, he proposes a utility function that gives a relatively simple way of overloading a method. The different versions are distinguished by the number of arguments (not their types). Another way of seeing it is that he factors out into a single place code that would usually be at the start of the method. Go check it out, it's a really interesting use of closures. I'll wait until you're done.