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Dificuldade em aplicar as funções foldr e foldl


crislanio_macedo

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Olá tenho uma grande dificuldade em saber aplicar as funções foldr e foldl,

Como exemplo tenho por exemplo a função elem, que teria que fazer usando foldr. Mas quais as análises a se fazer ?

elemento :: Eq a => a->[a]->Bool
elemento _ [] = False
elemento x (y:ys)
| x == y = True
|otherwise = elemento x ys

http://www.crislaniomacedo.zz.vc/categoria/tutoriais/haskell/

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