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JunsikChoi/Monoid-def.hs

Created March 20, 2020 01:57
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Definition of Monoid in Haskell
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Monoid-def.hs
class Semigroup a => Monoid a where
mempty :: m -- 항등원
mappend :: m -> m -> m -- 이항연산
mconcat :: [m] -> m
mconcat :: foldr mappend mempty
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