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If nothing else, #Haskell is a great language to learn so that you can use its interpreter, ghci, as a superpowered calculator
Combined with #nix you can add any Haskell package to the environment and import it in ghci. Super useful for when you want to, say, import the `linear` package to check your vector/matrix math
As I do this to test some logic I'm trying to implement in #rust I'm reminded of how clean the Haskell syntax is. Not necessarily elegant or simple (it's quite ad-hoc and complex in places), but definitely less noisy and more readable.