Why are functional programming languages used so rarely in practice?
Louis Cyphre

They are used in practice. Javascript is a functional language and incredibly mainstream. Facebook uses Haskell in production on the back end to filter posts. You can use LINQ in C#. There are list comprehensions in python. Angular is very monadic. Your premise is false and ignores the fact there’s a mix of imperative and functional features in all popular languages. A better question would be, “Why do so many imperative programmers not realize they’re already using functional language features?”

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