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by smegma2
2420 days ago
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The functor it returns should be the same functor it was called on, i.e. calling map on a Maybe should return a Maybe. The parameterized type can change so map can bring you from a Maybe<Int> to a Maybe<String> which is why in the above description we have Functor<B> instead of A. But what typescript is lacking is a way to describe that the functor returned should be the same. |
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