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The problem with that being that you redefine the unpack function every time a tuple is created. The this._NAME = VALUE; may look awful but it's more efficient.

You are just relying on your users to not abuse _ prefixed variables. It's far from ideal.

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Actually, good js implementations (like v8, for example) will only create one code object shared by all the unpack functions, with separate closures assigned to each. And since closures can (usually) be statically determined, they can use an offset lookup for the closured variable in place of a hashtable. So it's not quite as inefficient as it looks :).

Huh, I never knew that. Thanks! As long as you're in a decent environment that kind of definition becomes a lot smoother. I like it.

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