Functor
Revision as of 18:52, 19 September 2012 by Henk-Jan van Tuyl (talk | contribs) (Added section "More reading" with a link to "The functor design pattern")
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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)