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abuiles/foo.hs

Created October 26, 2009 21:27
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foo.hs
newtype ZipList a = ZipList { getZipList :: [a] }
instance Functor ZipList where
fmap g (ZipList a) = ZipList $ fmap g a
instance Applicative ZipList where
pure a = ZipList [a]
(ZipList fs) <*> (ZipList xs) = ZipList $ zipWith ($) fs xs
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