validation: A data-type like Either but with an accumulating Applicative
A data-type like Either but with differing properties and type-class instances.
Library support is provided for this different representation, include
lens
-related functions for converting between each and abstracting over their
similarities.
Validation
The Validation
data type is isomorphic to Either
, but has an instance
of Applicative
that accumulates on the error side. That is to say, if two
(or more) errors are encountered, they are appended using a Semigroup
operation.
As a consequence of this Applicative
instance, there is no corresponding
Bind
or Monad
instance. Validation
is an example of, "An applicative
functor that is not a monad."
Downloads
- validation-1.1.3.tar.gz [browse] (Cabal source package)
- Package description (revised from the package)
Note: This package has metadata revisions in the cabal description newer than included in the tarball. To unpack the package including the revisions, use 'cabal get'.
Maintainer's Corner
For package maintainers and hackage trustees
Candidates
Versions [RSS] | 0.3.0, 0.3.1, 0.3.2, 0.3.3, 0.3.4, 0.4.0, 0.4.1, 0.4.2, 0.4.3, 0.5.0, 0.5.1, 0.5.2, 0.5.3, 0.5.4, 0.5.5, 0.6.0, 0.6.1, 0.6.2, 0.6.3, 1, 1.1, 1.1.1, 1.1.2, 1.1.3 |
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Change log | changelog |
Dependencies | assoc (>=1 && <2), base (>=4.11 && <5), bifunctors (>=5.5 && <6), deepseq (>=1.4.3 && <1.6), lens (>=4.0.5 && <6), semigroupoids (>=5.2.2 && <7), semigroups (>=0.18.2 && <1) [details] |
Tested with | ghc ==9.0.1, ghc ==8.10.4, ghc ==8.8.4, ghc ==8.6.5, ghc ==8.4.4 |
License | BSD-3-Clause |
Copyright | Copyright (C) 2010-2013 Tony Morris, Nick Partridge Copyright (C) 2014,2015 NICTA Limited Copyright (c) 2016-2019, Commonwealth Scientific and Industrial Research Organisation (CSIRO) ABN 41 687 119 230. |
Author | Tony Morris <ʇǝu˙sıɹɹoɯʇ@ןןǝʞsɐɥ> <dibblego>, Nick Partridge <nkpart> |
Maintainer | Tony Morris <ʇǝu˙sıɹɹoɯʇ@ןןǝʞsɐɥ> <dibblego>, Nick Partridge <nkpart>, Queensland Functional Programming Lab <oᴉ˙ldɟb@llǝʞsɐɥ> |
Revised | Revision 1 made by Bodigrim at 2024-05-05T21:47:22Z |
Category | Data |
Home page | https://github.com/qfpl/validation |
Bug tracker | https://github.com/qfpl/validation/issues |
Source repo | head: git clone git@github.com:qfpl/validation.git |
Uploaded | by TonyMorris at 2023-07-10T22:37:00Z |
Distributions | LTSHaskell:1.1.3, NixOS:1.1.3, Stackage:1.1.3 |
Reverse Dependencies | 22 direct, 26 indirect [details] |
Downloads | 25965 total (207 in the last 30 days) |
Rating | 2.5 (votes: 3) [estimated by Bayesian average] |
Your Rating | |
Status | Docs available [build log] Last success reported on 2023-07-11 [all 1 reports] |