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My first introduction to functional programming was with J (APL but using ASCII) during my sophomore year of college and I definitely didn't have the chops to understand it at that point. I was scared of functional languages for another year until a different professor introduced me to Haskell.

APL is far more readable than J in my opinion, perhaps because APL keeps the brackets and curlies balanced, while J doesn't. All operators in APL are one token long, while J uses multi-token operators. The extended character set of APL has many benefits.

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