Haskell is beautiful and will teach you to think about programming in a new way. OCaml is useful with its libraries and healthy community of users. F# is like OCaml but you can run it on .NET.

Still, according to OCaml maintainers, "some work remains to offer long-term, user-facing concurrent and parallel programming abstractions", so those abstractions will not make it into OCaml 5.

Microsoft has announced that support for the F# functional programming language will be fully integrated into Visual Studio. This marks a bold new commitment to facilitating functional programming ...