The compiler isn't very 'user-friendly', but if you're literally looking for "Haskell on the JVM" and don't care about speed, Frege is a lot of fun once you get

The compiler isn't very 'user-friendly', but if you're literally looking for "Haskell on the JVM" and don't care about speed, Frege is a lot of fun once you get used to it. Impure functions/variables must be wrapped in a monad (ST) (take a look at [0]. Frege is almost identical to Haskell, but with a few differences [1] [0] https://github.com/Frege/frege-native-gen/issues/14 https://github.com/Frege/frege-native-gen/issues/14 [1] https://github.com/Frege/frege/wiki/Differences-between-Frege-and-Haskell https://github.com/Frege/frege/wiki/Differences-between-Freg...