I agree, I like OCaml, I like JS, I'm not a fan of Reason. It just feels off somehow, and half-baked. From my limited exprience in Swift, it does have function

I agree, I like OCaml, I like JS, I'm not a fan of Reason. It just feels off somehow, and half-baked. From my limited exprience in Swift, it does have functional parts, although I don't know if that's the main focus of the language, or just a nice thing to have. Kotlin seems a bit more functional than Java, although Java has been catching up recently (sealed classes, pattern matching, record).