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Simplify unzip using the Applicative instance.

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Rob Rix 2016-04-04 15:41:01 -04:00
parent fd150be38e
commit de6696ce50
1 changed files with 1 additions and 1 deletions
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src/Data/Functor/Both.hs
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@ -44,7 +44,7 @@ snd = Prelude.snd . runBoth
unzip :: [Both a] -> Both [a] unzip :: [Both a] -> Both [a]
unzip = foldr pair (pure []) unzip = foldr pair (pure [])
where pair (Join (a, b)) (Join (as, bs)) = Join (a : as, b : bs) where pair head tail = (:) <$> head <*> tail
instance Monoid a => Monoid (Join (,) a) where instance Monoid a => Monoid (Join (,) a) where
mempty = pure mempty mempty = pure mempty