Two Years of Functional Programming in JavaScript: Lessons Learned

Re:Two Years of Functional Programming in JavaScript: Lesson... by ricksnyke on Thursday April 12, 2018 @10:56PM (#16826838)

Functional in JavaScript never made sense to me, we don't have immutability in the language. While V8 has made optimisations for short lived objects this doesn't hold true across the board so perf can be quite terrible with "pure" style FP.

Theoretically "pure" code is beautiful, in practice it tends to perform badly especially in languages that don't have value types and copy mechanisms.

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Re:Two Years of Functional Programming in JavaScript: Lesson... by scottmf on Friday April 13, 2018 @01:47AM (#16827395)

Do you have any data to show that this is a real concern with JS?

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Re:Two Years of Functional Programming in JavaScript: Lesson... by tracker1 on Friday April 13, 2018 @10:09AM (#16830111)

It may depend on the context, and with some VERY large data models, something like even Redux would be less efficient. TBH though, I find that practicing FP in JS even in a less pure form isn't so bad. I tend to prefer shallow clones as responses in favor over mutations. Though I will mutate an object, when it's exclusively inside a function/module and sealed from the outside so that such mutations are at least in isolation.

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