[Haskell-cafe] A function for Maybes

Is there a built-in function that already does this? foo :: (a -> b) -> Maybe a -> Maybe b foo f m | isNothing m = Nothing | otherwise = Just (f (fromJust m)) *Main> foo (+2) (Just 3) Just 5 *Main> foo (+2) Nothing Nothing If so what is it? If not, what should I call it? Thanks -John