A monad is a mechanism for injecting orthogonal semantics into a chain of functions; without the functions knowing it. Why a chain? One reason is that a chain of functions is time ordered. It forces the ordering of operations.
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I think flick through the whole thing, and get what you can, but the bit you're looking for starts with Composition.https://slides.com/richardadalton/advanced_fp_for_beginners#/7 …
I am of the opinion that: "Parametric, Easy to add new behaviour, hard to add new types" is no longer true :)
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Maybe that word should be “easier”. Easier than the alternative. Nothing is really “Easy” :-)
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