"haskell functor" Code Answer's
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haskell functor
Prickly Platypus
on Dec 06, 2020
-- Functors are a class of data structure that "contain" a generic type
-- you can "inject" functions inside these functors with `fmap`
-- Applying a function "inside" of a functor will not change the structure
-- of the functor
-- e.g `fmap (\x -> x + 1)` [1..10] will not change the length of the list
-- Functors require an implentation of `fmap`
fmap :: Functor f => (a -> b) -> f a -> f b
-- and have to obey the functor laws:
-- fmap id = id
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