Created
April 18, 2017 21:00
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join for a hypothetical ziplist monad is the diagonal of the product
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| -- https://en.wikibooks.org/wiki/Haskell/Category_theory#The_second_law | |
| join . fmap return = join . return = id | |
| return = repeat | |
| join . fmap repeat = join . repeat = id | |
| -- let's try it on some arbitrary list | |
| join [repeat a, repeat b, ...] = join (repeat [a, b, c, ...]) = [a, b, c, ...] |
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