[adelarsq]

My two cents would be on F#.

Yes, isn't a mainstream language but there are a lot of interesting things with it:

- build for .NET or languages supported by Fable (JavaScript, Dart*, Python*, Rust*, PHP*) - I did build a proof of concept Flutter app with it

- multiparadigm - FP or OO, you choose

- clean syntax - based on indent just like Python

- Type providers, type inference, ...

* These are on Fable 4.0.0-theta-018 at moment