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If I want to do functional programming, I can do that just fine in most languages.

If I want to do imperative programming, I can do that just fine in most languages, except for functional programming languages.

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I think the key with a functional language is given a large codebase, you can reason about it functionally instead of hoping there's no imperative code in there (on purpose or by bug)

Kind of like if you're wearing a straitjacket, you don't need to worry about accidentally punching yourself in the face.

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