Ocaml isn't too pure. It's just weaker in libraries (and has no threading). It's faster than Scala in my experience, but not by more than 50%. I like Scala q

Ocaml isn't too pure. It's just weaker in libraries (and has no threading). It's faster than Scala in my experience, but not by more than 50%. I like Scala quite a lot so far. The main pleasure of Haskell or Ocaml over Scala is that they can deduce all your types (even function arguments), whereas Scala supports overloading and can't.