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 | 2269 total (7 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] |