[Haskell-beginners] Trivial function of type (a -> b) -> Maybe
a -> Maybe b
e.zagorodniy at gmail.com
Wed Jan 13 10:01:13 EST 2010
Wed, 13 Jan 2010 08:47:42 -0600 Antoine Latter:
> On Wed, Jan 13, 2010 at 8:44 AM, Eugen Zagorodniy
> <e.zagorodniy at gmail.com> wrote:
> > Greetings!
> > I looked at documentation of Maybe type and suprisingly found no
> > function like
> > maybize :: (a -> b) -> Maybe a -> Maybe b
> > maybize f Nothing = Nothing
> > maybize f (Just x) = Just (f x)
> Have you looked at:
> fmap :: Functor f => (a -> b) -> f a -> f b
> It will do what you want, and has the bonus of doing the same
> operation for a lot more structures.
Sure that is it. I should pay more attention to standard type classes.
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