Ask HN: What is the best functional programming language for data science?

I'm currently exploring Haskell, OCaml, and Clojure with respect to not only the core language features themselves, but also with respect to their communities and third-party frameworks for math and machine learning. I'm mostly interested in the best "general purpose functional programming language for data science" but would also be curious which functional languages have a particularly strong hand within specific domains (e.g. medical, finance, etc.)