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A comment on Ask HN: ELI5 What Is a Monad?. Parent comment

Re:Ask HN: ELI5 What Is a Monad? by badpun on Monday November 14, 2022 @02:48PM (#33599882)
I'm not an FP expert by any means, but isn't having a flat-map operation (i.e. being able to combine two monads together, with result being another monad) a defining part of being a Monad?
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Re:Ask HN: ELI5 What Is a Monad? by Tainnor on Monday November 14, 2022 @08:21PM (#33604017)
Yes.

"A value in a box" is more like a metaphor for a functor.

The key part about monads is that you can "merge the boxes" (to strain the analogy). Or, as I'd prefer to think about it, to merge different effects.

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