Apply the supplied function to corresponding elements while preserving the stopping rule:
zipWith :: (a -> b -> c) -> [a] -> [b] -> [c]
zipWith f []     _      = []
zipWith f _      []     = []
zipWith f (x:xs) (y:ys) = f x y : zipWith f xs ys
Because of lazy evaluation, constructing a result cons does not by itself evaluate f x y.

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