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doismellburning/foo.hs

Created August 13, 2014 16:01
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foo.hs
-- Does this function already exist? Because it's not liftA2 / liftM2
foo :: (a -> a -> a) -> Maybe a -> Maybe a -> Maybe a
foo f x Nothing = x
foo f Nothing x = x
foo f (Just x) (Just y) = Just (f x y)
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