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learning-haskell/16-functor/16.11-possibly.md

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Chapter 16

Maybe

Exercise: Possibly

see src/Possibly.hs

Either

Short Exercise

Exercise 1

see src/Sum.hs

Excercise 2

Functor expects a type with kind * -> *. Sum and Either are of kind * -> * -> * In order to reduce it to * -> * we need to apply one type of kind *, but the only one we can apply right now is the first in the list.