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 program

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-371839520 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.