acme-cofunctor: A Cofunctor is a structure from category theory dual to Functor
A Cofunctor
is a structure from category theory dual to Functor
.
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.
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Versions [RSS] | 0.1.0.0, 0.1.1.0 |
---|---|
Change log | CHANGELOG.md |
Dependencies | base (>=4 && <5) [details] |
License | BSD-3-Clause |
Copyright | 2014 Jasper Van der Jeugt |
Author | Jasper Van der Jeugt <m@jaspervdj.be> |
Maintainer | Jasper Van der Jeugt <m@jaspervdj.be> |
Category | Acme |
Home page | https://github.com/jaspervdj/acme-cofunctor |
Source repo | head: git clone https://github.com/jaspervdj/acme-cofunctor |
Uploaded | by JasperVanDerJeugt at 2017-05-13T10:15:09Z |
Distributions | NixOS:0.1.1.0 |
Reverse Dependencies | 1 direct, 0 indirect [details] |
Downloads | 2265 total (11 in the last 30 days) |
Rating | 2.0 (votes: 2) [estimated by Bayesian average] |
Your Rating | |
Status | Docs available [build log] Last success reported on 2017-05-13 [all 1 reports] |