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Well, there are a lot of different implementations of Javascript.

You can absolutely download the source to Google's v8 javascript engine (http://code.google.com/p/v8/ ), or the implementations that Mozilla has built over the years (https://developer.mozilla.org/en/SpiderMonkey and http://www.mozilla.org/rhino/ ).

EDIT: Yeah check the comment below regarding tracemonkey rather than spidermonkey.

It should also be noted that Javascript is a specification first and foremost (unlike Ruby which is defined primarily by its reference implementation). It's worth reading through the standard: http://www.ecma-international.org/publications/standards/Ecm...

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