Haskell will bend your mind with its advanced type system and abstractions from category theory. So it's a must.
Also, any LISP will do, as mentioned by Joshua. Personally, I tried Hy and Clojure. And also Smalltalk, as far as I remember it is one of the most loved languages by the Stack Overflow community. Oh, yeah, Prolog or any logic programming language might also be interesting.
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Haskell will bend your mind with its advanced type system and abstractions from category theory. So it's a must.
Also, any LISP will do, as mentioned by Joshua. Personally, I tried Hy and Clojure. And also Smalltalk, as far as I remember it is one of the most loved languages by the Stack Overflow community. Oh, yeah, Prolog or any logic programming language might also be interesting.