Popularity
6.5
Growing
Activity
0.0
Stable
14
5
2
Monthly Downloads: 2
Programming language: Haskell
License: BSD 3-clause "New" or "Revised" License
Tags:
ACME
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README
acme-cofunctor
A Cofunctor is a structure from category theory dual to Functor.
We all know that a Functor is defined by the operation 'fmap':
fmap :: (a -> b) -> (f a -> f b)
This means that its dual must be defined by the following operation:
cofmap :: (b -> a) -> (f b -> f a)
Since beginning his investigations, the author of this package has discovered
that this pattern is at least as commonly used as Functor. In fact, many
ubiquitous Haskell types (e.g. [], Maybe, ((->) a) turn out to have a
Cofunctor instance.