@hutaffe If by 'language of choice' you mean the language that's in vouge, I think JavaScript is (unfortunately) the answer. That said, I agree with everyone that's suggested sticking with Ruby. If you feel like you've done enough of that, how about Elixir? I love Ruby and have found Elixir a comfortable way to explore functional programming techniques. Or if you're familiar with Swift, why not server-side Swift? Max Howell just started a new series on it) and it sounds more practical than ever before.