Functor: Difference between revisions
BrettGiles (talk | contribs) m (Adding Monad category) |
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fmap (p . q) = (fmap p) . (fmap q) | fmap (p . q) = (fmap p) . (fmap q) | ||
[[Category:Monad]] | [[Category:Monad]] | ||
Revision as of 02:34, 31 July 2008
| import Control.Monad |
The Functor class is defined like this:
class Functor f where fmap :: (a -> b) -> f a -> f b
All instances of Functor should obey:
fmap id = id fmap (p . q) = (fmap p) . (fmap q)