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Functional programming and immutability are hot right now. On one hand, this is pretty great as there’s lots of nice things about functional programming. On the other hand, people get a little overzealous and start claiming that imperative code is unnatural or that purity is always preferable to mutation. I think that the appropriate paradigm is heavily dependent on context, but a lot of people speak in universals. I keep hearing that it’s easier to analyze pure functional code than mutable impe...