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dminuoso/gist.hs

Created January 9, 2020 22:37
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gist.hs
manyN :: Int -> f a -> f [a]
manyN n v = many_v n
where
many_v 0 = pure []
many_v n = some_v (n - 1) <|> pure []
some_v 0 = pure []
some_v n = liftA2 (:) v (many_v (n - 1))
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