I want to spend a month going deep on a programming language that I'm not very familiar with.

What language would you recommend and why?

(Not eligible: JS, TS, Python, Rust, C, C++, Java, Smalltalk)

Thanks for the suggestions! The most common answers so far:

- Prolog or Datalog
- Elixir and/or Erlang
- APL + variants (BQN, Q)
- Clojure
- Haskell
- Forth

Update: Forth is fun.