I agree with your comment about 2 and 3 being different languages, but to be fair, Ruby and Perl don't share one set of libraries/extensions that may work on bo

I agree with your comment about 2 and 3 being different languages, but to be fair, Ruby and Perl don't share one set of libraries/extensions that may work on both, yet may work on only one. I don't find the jQuery/Mootools comparison relevant because neither of them are (or even claim to be) languages of their own.