Every monad is a monoid in the category of endofunctors, it is literally the definition of monad. But what do you expect from clippy...
Yeah, the thing is, "a monad is a monoid in the category of endofunctors" is kind of a meme among non-Haskell developers. Personally, I think Haskell is a very interesting language. The mathematical jargon, however, is impenetrable, and this particular expression is kind of the poster child. I'mma go look at Erlang if I want my functional language fix without making my head hurt, thank ye very much.
I wish this was exaggerated, but it isn't at all. Every time I try to learn Haskell, I end up in some tutorial: "You know how you sometimes need to represent eigenvectors in an n-dimensional plane with isotonically theoretical pulsarfunctions? Haskell types make that easy!"
There is no way.
It's a thing! Sadly it won't rewrite Haskell codebases for you, though.
