Copyright	(c) 2014 Chris Allen Edward Kmett (c) 2018 Kowainik
License	MIT
Maintainer	Kowainik <xrom.xkov@gmail.com>
Safe Haskell	Safe
Language	Haskell2010

Relude.Extra.Validation

Description

Monoidal Validation sibling to Either.

Synopsis

data Validation e a
- = Failure e
- | Success a
validationToEither :: Validation e a -> Either e a
eitherToValidation :: Either e a -> Validation e a

Documentation

data Validation e a Source #

Validation is Either with a Left that is a Monoid

Constructors

Failure e
Success a

Instances

Bitraversable Validation Source #
Instance details Defined in Relude.Extra.Validation Methods bitraverse :: Applicative f => (a -> f c) -> (b -> f d) -> Validation a b -> f (Validation c d) #
Bifoldable Validation Source #
Instance details Defined in Relude.Extra.Validation Methods bifold :: Monoid m => Validation m m -> m # bifoldMap :: Monoid m => (a -> m) -> (b -> m) -> Validation a b -> m # bifoldr :: (a -> c -> c) -> (b -> c -> c) -> c -> Validation a b -> c # bifoldl :: (c -> a -> c) -> (c -> b -> c) -> c -> Validation a b -> c #
Bifunctor Validation Source #
Instance details Defined in Relude.Extra.Validation Methods bimap :: (a -> b) -> (c -> d) -> Validation a c -> Validation b d # first :: (a -> b) -> Validation a c -> Validation b c # second :: (b -> c) -> Validation a b -> Validation a c #
Functor (Validation e) Source #
Instance details Defined in Relude.Extra.Validation Methods fmap :: (a -> b) -> Validation e a -> Validation e b # (<$) :: a -> Validation e b -> Validation e a #
Semigroup e => Applicative (Validation e) Source #	Examples `>>>` *`let fa = Success (3) :: Validation [Text] (Int -> Int)``>>>` `let ga = Success (4) :: Validation [Text] (Int -> Int)``>>>` `let a = Success 1 :: Validation [Text] Int``>>>` `let b = Success 7 :: Validation [Text] Int``>>>` `let c = Failure ["Not correct"] :: Validation [Text] Int``>>>` `let d = Failure ["Not correct either"] :: Validation [Text] Int`* `>>>` *`fa <> b`Success 21 `>>>` `fa <> c`Failure ["Not correct"] `>>>` `c > d > b`Failure ["Not correct","Not correct either"] `>>>` `liftA2 (+) a b`Success 8 `>>>` `liftA2 (+) a c`*Failure ["Not correct"]
Instance details Defined in Relude.Extra.Validation Methods pure :: a -> Validation e a # (<>) :: Validation e (a -> b) -> Validation e a -> Validation e b # liftA2 :: (a -> b -> c) -> Validation e a -> Validation e b -> Validation e c # (>) :: Validation e a -> Validation e b -> Validation e b # (<*) :: Validation e a -> Validation e b -> Validation e a #
Foldable (Validation e) Source #
Instance details Defined in Relude.Extra.Validation Methods fold :: Monoid m => Validation e m -> m # foldMap :: Monoid m => (a -> m) -> Validation e a -> m # foldr :: (a -> b -> b) -> b -> Validation e a -> b # foldr' :: (a -> b -> b) -> b -> Validation e a -> b # foldl :: (b -> a -> b) -> b -> Validation e a -> b # foldl' :: (b -> a -> b) -> b -> Validation e a -> b # foldr1 :: (a -> a -> a) -> Validation e a -> a # foldl1 :: (a -> a -> a) -> Validation e a -> a # toList :: Validation e a -> [a] # null :: Validation e a -> Bool # length :: Validation e a -> Int # elem :: Eq a => a -> Validation e a -> Bool # maximum :: Ord a => Validation e a -> a # minimum :: Ord a => Validation e a -> a # sum :: Num a => Validation e a -> a # product :: Num a => Validation e a -> a #
Traversable (Validation e) Source #
Instance details Defined in Relude.Extra.Validation Methods traverse :: Applicative f => (a -> f b) -> Validation e a -> f (Validation e b) # sequenceA :: Applicative f => Validation e (f a) -> f (Validation e a) # mapM :: Monad m => (a -> m b) -> Validation e a -> m (Validation e b) # sequence :: Monad m => Validation e (m a) -> m (Validation e a) #
(Semigroup e, Monoid e) => Alternative (Validation e) Source #
Instance details Defined in Relude.Extra.Validation Methods empty :: Validation e a # (<\|>) :: Validation e a -> Validation e a -> Validation e a # some :: Validation e a -> Validation e [a] # many :: Validation e a -> Validation e [a] #
(Eq e, Eq a) => Eq (Validation e a) Source #
Instance details Defined in Relude.Extra.Validation Methods (==) :: Validation e a -> Validation e a -> Bool # (/=) :: Validation e a -> Validation e a -> Bool #
(Ord e, Ord a) => Ord (Validation e a) Source #
Instance details Defined in Relude.Extra.Validation Methods compare :: Validation e a -> Validation e a -> Ordering # (<) :: Validation e a -> Validation e a -> Bool # (<=) :: Validation e a -> Validation e a -> Bool # (>) :: Validation e a -> Validation e a -> Bool # (>=) :: Validation e a -> Validation e a -> Bool # max :: Validation e a -> Validation e a -> Validation e a # min :: Validation e a -> Validation e a -> Validation e a #
(Show e, Show a) => Show (Validation e a) Source #
Instance details Defined in Relude.Extra.Validation Methods showsPrec :: Int -> Validation e a -> ShowS # show :: Validation e a -> String # showList :: [Validation e a] -> ShowS #

validationToEither :: Validation e a -> Either e a Source #

Transform a Validation into an Either.

eitherToValidation :: Either e a -> Validation e a Source #

Transform an Either into a Validation.