[oalessandr]

I know it's not in the options you listed, but why not Scala?

It has the nice things of the languages above, combined together:

- a concise high-level programming language

- a compiler that helps avoiding bugs

- fast runtime

- access to a great ecosystem of libraries

(In better words: https://github.com/scala/scala-lang/pull/852#issuecomment-37...)

Moreover, if you work with Data Scientists you might find convenient working in Spark's native language.

A great thing about Scala is that you can either use as a better Java (availability of developers) or go fully functional-category theory like Haskell with libraries such as Cats.