Comment by RKFADU_UOFCCLEL

F# is a very well-polished functional language. Think of it to Haskell as C# is to Java. No worries about space leaks or purely-academic syntax or monads (though you can get those if you need them). All with tight integration into one of the biggest, well-established ecosystem (CLI). It's managed by smart people who know how to keep it from derailing as it grows.