this post was submitted on 10 Sep 2023
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Programming
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Haskell, because nobody knows haskell
Unfortunately, no one can be told what a monad is. You have to see it for yourself (then you won’t be able to explain it to anyone)
If you use JavaScript, you've probably seen a monad, since Promise is a monad. Unit is
Promise.resolve(), bind isPromise.then(). As required,Promise.resolve(x).then(y) === y(x)(unit forms a left identity of bind),y.then(Promise.resolve) === y(unit forms a right identity of bind), andx.then(y.then(z)) === x.then(y).then(z)(bind is essentially associative).You even have the equivalent of Haskell's fancy do-notation (a form of syntactic sugar to save writing unit and bind all over the place) in the form of async/await. It's just not generalized the way it is in Haskell.