Difference between revisions of "Functor"
Jump to navigation
Jump to search
BrettGiles (talk | contribs) m (Adding Monad category) |
m (Remove Category:Standard classes - now in template) |
||
Line 10: | Line 10: | ||
fmap (p . q) = (fmap p) . (fmap q) |
fmap (p . q) = (fmap p) . (fmap q) |
||
− | [[Category:Standard classes]] |
||
[[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)