either-4.4.1: An either monad transformer

Copyright(c) 2014 Chris Allen, Edward Kmett
LicenseBSD-style
Maintainerekmett@gmail.com
Stabilityprovisional
Portabilityportable
Safe HaskellSafe
LanguageHaskell98

Data.Either.Validation

Description

Monoidal Validation sibling to Either.

Synopsis

Documentation

data Validation e a Source

Validation is Either with a Left that is a Monoid

Constructors

Failure e 
Success a 

Instances

Bifunctor Validation Source 

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

Bitraversable Validation Source 

Methods

bitraverse :: Applicative f => (a -> f c) -> (b -> f d) -> Validation a b -> f (Validation c d)

bisequenceA :: Applicative f => Validation (f a) (f b) -> f (Validation a b)

bimapM :: Monad m => (a -> m c) -> (b -> m d) -> Validation a b -> m (Validation c d)

bisequence :: Monad m => Validation (m a) (m b) -> m (Validation a b)

Bifoldable Validation Source 

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

Functor (Validation e) Source 

Methods

fmap :: (a -> b) -> Validation e a -> Validation e b

(<$) :: a -> Validation e b -> Validation e a

Semigroup e => Applicative (Validation e) Source 

Methods

pure :: a -> Validation e a

(<*>) :: Validation e (a -> b) -> Validation e a -> Validation e b

(*>) :: Validation e a -> Validation e b -> Validation e b

(<*) :: Validation e a -> Validation e b -> Validation e a

Foldable (Validation e) Source 

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 

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 

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]

Alt (Validation e) Source 

Methods

(<!>) :: Validation e a -> Validation e a -> Validation e a

some :: Applicative (Validation e) => Validation e a -> Validation e [a]

many :: Applicative (Validation e) => Validation e a -> Validation e [a]

(Eq e, Eq a) => Eq (Validation e a) Source 

Methods

(==) :: Validation e a -> Validation e a -> Bool

(/=) :: Validation e a -> Validation e a -> Bool

(Ord e, Ord a) => Ord (Validation e a) Source 

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 

Methods

showsPrec :: Int -> Validation e a -> ShowS

show :: Validation e a -> String

showList :: [Validation e a] -> ShowS

Monoid e => Monoid (Validation e a) Source 

Methods

mempty :: Validation e a

mappend :: Validation e a -> Validation e a -> Validation e a

mconcat :: [Validation e a] -> Validation e a

Semigroup e => Semigroup (Validation e a) Source 

Methods

(<>) :: Validation e a -> Validation e a -> Validation e a

sconcat :: NonEmpty (Validation e a) -> Validation e a

times1p :: Natural -> Validation e a -> Validation e a

_Success :: Prism (Validation c a) (Validation c b) a b Source

_Failure :: Prism (Validation a c) (Validation b c) a b Source

_Validation :: Iso (Validation e a) (Validation g b) (Either e a) (Either g b) Source

Validation is isomorphic to Either