| Copyright | (c) 2014 Chris Allen, Edward Kmett |
|---|---|
| License | BSD-style |
| Maintainer | ekmett@gmail.com |
| Stability | provisional |
| Portability | portable |
| Safe Haskell | Safe |
| Language | Haskell98 |
Data.Either.Validation
Description
Monoidal Validation sibling to Either.
- data Validation e a
- _Success :: Prism (Validation c a) (Validation c b) a b
- _Failure :: Prism (Validation a c) (Validation b c) a b
- eitherToValidation :: Either e a -> Validation e a
- validationToEither :: Validation e a -> Either e a
- _Validation :: Iso (Validation e a) (Validation g b) (Either e a) (Either g b)
Documentation
data Validation e a Source
Validation is Either with a Left that is a Monoid
Instances
| Bifunctor Validation Source | |
| Bitraversable Validation Source | |
| Bifoldable Validation Source | |
| Functor (Validation e) Source | |
| Semigroup e => Applicative (Validation e) Source | |
| Foldable (Validation e) Source | |
| Traversable (Validation e) Source | |
| (Semigroup e, Monoid e) => Alternative (Validation e) Source | |
| Alt (Validation e) Source | |
| (Eq e, Eq a) => Eq (Validation e a) Source | |
| (Ord e, Ord a) => Ord (Validation e a) Source | |
| (Show e, Show a) => Show (Validation e a) Source | |
| Monoid e => Monoid (Validation e a) Source | |
| Semigroup e => Semigroup (Validation e a) Source |
_Success :: Prism (Validation c a) (Validation c b) a b Source
_Failure :: Prism (Validation a c) (Validation b c) a b Source
eitherToValidation :: Either e a -> Validation e a Source
validationToEither :: Validation e a -> Either e a Source
_Validation :: Iso (Validation e a) (Validation g b) (Either e a) (Either g b) Source
Validation is isomorphic to Either