If you only ever worked in JS (browser and/or server), branch out. Try different things instead, it'll make you a better JS developer (and better developer in g

If you only ever worked in JS (browser and/or server), branch out. Try different things instead, it'll make you a better JS developer (and better developer in general) if you try to learn things that are far out from your current skill set. If you're into types, go for Haskell or Erlang. If you're into dynamic runtimes, go for Clojure or Smalltalk.