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@freemo The assessment in a functional programming course I teach is to write a command line interface (CLI) program in Haskell. I won't bore you with the specifics. But if you have a CLI you fancy writing, try using Haskell. (BTW optparse-applicative is your friend for CLIs.)
so worth it. Will make you a better programmer
... because you'll spend so much more time learning your other languages better so you don't have to use Haskell.
@freemo I have similar worries about pragmatism if I stray of a well troden path. I find that's balanced by the joy of using / learning different languages.
If you can, just try it. If you hit a wall early on then pivot. Logic can be moved to another language.
Although niche, Haskell is a very solid and mature language, as you probably already know. 😁
Good luck! Have fun!