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dtchepak/zipwith.hs

Created March 1, 2012 01:47
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recursive zipwith
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zipwith.hs
zipWith' :: (a -> b -> c) -> [a] -> [b] -> [c]
zipWith' _ [] _ = []
zipWith' _ _ [] = []
zipWith' f (a:as) (b:bs) = (f a b):(zipWith' f as bs)
@OJ

OJ commented Mar 1, 2012

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-- your first two cases aren't required, just match against anything else
-- but match against the valid case first
zipWith' f (a:as) (b:bs) = f a b : zipWith' f as bs
zipWith' _ _ _ = []

@dtchepak

dtchepak commented Mar 1, 2012

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@OJ Nice pickup. Thanks.

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