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Redux in the react world is a good example of real-world application using pure functions and functional programming concepts.

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Likewise most of the hooks (useReducer being the obvious primary example), and functional components in general. That's how 99% of functional programming is done - state and function are separate, first class, concepts. The line is very distinct.

I don’t thinks hooks are a great example. Hooks are by definition effectful. Best compared to ‘Applicative’s in Haskell. (Not monadic unfortunately)

So a functional component in react using hooks is not pure. You can translate it into FP with a bit of magic, but requires a context. The line is not that distinct at all.

Hooks themselves may not be good FP examples, however I meant the resultant functional components that you develop yourself usually are.

Hooks are implicitly injecting whatever global state in your stateless components, so definitely not a good example of functional concepts imho.

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