They're all equally (in)effective at delivering a result, such that it's mostly a matter of the employer's technology bias, so, because they're all about the same level of difficulty, i.e. not very, the simplest thing to do is learn them all, then pay attention to which is favoured by the employer, and mention only that one in your application, because lots of employers think that the maxim of "jack of all trades master of none" applies to knowlege of programming languages, which it doesn't, but lots of potential employers think it does, and they're the ones signing the cheques, so play along.

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