"... we can think of fmap not as a function that takes one function and a functor value and returns a functor value, but as a function that takes a function and returns a new function that's just like the old one, expect that it takes a functor value as a parameter and returns a functor value as the result."
Presa dal libro "Learn You a Haskell for Great Good".
Ripetere ogni sera 3 volte prima di andare a dormire. lol
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