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I thought I understand monad after reading the article, but then I read the comment and now I am confused what is monad (again)?

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I recommend reading the original "Monads for Functional Programming" paper by Phil Wadler, it's in a tutorial style and IMHO still better than any blog post explanation I have seen:

https://homepages.inf.ed.ac.uk/wadler/papers/marktoberdorf/b...

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