It's done in Professor Frisby's guide here and in his videos:
And in the Composing Software book (this is a part of it):
(He also points out rightly that one can just omit join altogether and use a chained identity for this kind of thing. That might actually be easier from an educational perspective, I'm not sure.)
As does the monet.js monad library which aliases join to be like .chain(a => a) which might as well be () => x in the end, it's just a semantic difference.
.chain(a => a)
() => x
And this last one on Maybe by James Sinclair is another, just using a class-style monad.
For Monad to make sense, types cannot be ignored. That is why join is being misunderstood.
I have not watched Professor Frisby's explanation so I have no comment there.
Eric Elliot misunderstands join in his article you linked. I'll try and get in touch.
monet.js does it right. Read carefully what the type of join is.
James Sinclair describes join accurately and then, following that, explains why emit cannot be defined for Maybe. I recommend rereading his work carefully.
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