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No, mutability was always central to Haskell. Investigating how you could track through the type system and isolate the parts of programs requiring side-effects

No, mutability was always central to Haskell. Investigating how you could track through the type system and isolate the parts of programs requiring side-effects was the research goal of Haskell. It’s the most notable evolution from Miranda. Haskell issue is not that mutability is an afterthought. Haskell issue is that Haskell is a good research project but not a very good programming language.

douglasisshiny 4y ago
That could be the case. I've never used it. I did "learn" it to use a library (fp-ts) in typescript which basically brings Haskell into typescript and I love the concepts. It's certainly changed the way I think about programming.