Safe Haskell	Safe-Inferred
Language	Haskell2010

PlutusTx.Either

Synopsis

data Either a b
- = Left a
- | Right b
isLeft :: Either a b -> Bool
isRight :: Either a b -> Bool
either :: (a -> c) -> (b -> c) -> Either a b -> c

Documentation

data Either a b Source #

The Either type represents values with two possibilities: a value of type Either a b is either Left a or Right b.

The Either type is sometimes used to represent a value which is either correct or an error; by convention, the Left constructor is used to hold an error value and the Right constructor is used to hold a correct value (mnemonic: "right" also means "correct").

Examples

Expand

The type Either String Int is the type of values which can be either a String or an Int. The Left constructor can be used only on Strings, and the Right constructor can be used only on Ints:

>>> let s = Left "foo" :: Either String Int
>>> s
Left "foo"
>>> let n = Right 3 :: Either String Int
>>> n
Right 3
>>> :type s
s :: Either String Int
>>> :type n
n :: Either String Int

The fmap from our Functor instance will ignore Left values, but will apply the supplied function to values contained in a Right:

>>> let s = Left "foo" :: Either String Int
>>> let n = Right 3 :: Either String Int
>>> fmap (*2) s
Left "foo"
>>> fmap (*2) n
Right 6

The Monad instance for Either allows us to chain together multiple actions which may fail, and fail overall if any of the individual steps failed. First we'll write a function that can either parse an Int from a Char, or fail.

>>> import Data.Char ( digitToInt, isDigit )
>>> :{
    let parseEither :: Char -> Either String Int
        parseEither c
          | isDigit c = Right (digitToInt c)
          | otherwise = Left "parse error"
>>> :}

The following should work, since both '1' and '2' can be parsed as Ints.

>>> :{
    let parseMultiple :: Either String Int
        parseMultiple = do
          x <- parseEither '1'
          y <- parseEither '2'
          return (x + y)
>>> :}

>>> parseMultiple
Right 3

But the following should fail overall, since the first operation where we attempt to parse 'm' as an Int will fail:

>>> :{
    let parseMultiple :: Either String Int
        parseMultiple = do
          x <- parseEither 'm'
          y <- parseEither '2'
          return (x + y)
>>> :}

>>> parseMultiple
Left "parse error"

Constructors

Left a
Right b

Instances

Instances details

FromJSON2 Either
Instance details Defined in Data.Aeson.Types.FromJSON Methods liftParseJSON2 :: Maybe a -> (Value -> Parser a) -> (Value -> Parser [a]) -> Maybe b -> (Value -> Parser b) -> (Value -> Parser [b]) -> Value -> Parser (Either a b) liftParseJSONList2 :: Maybe a -> (Value -> Parser a) -> (Value -> Parser [a]) -> Maybe b -> (Value -> Parser b) -> (Value -> Parser [b]) -> Value -> Parser [Either a b] liftOmittedField2 :: Maybe a -> Maybe b -> Maybe (Either a b)
ToJSON2 Either
Instance details Defined in Data.Aeson.Types.ToJSON Methods liftToJSON2 :: (a -> Bool) -> (a -> Value) -> ([a] -> Value) -> (b -> Bool) -> (b -> Value) -> ([b] -> Value) -> Either a b -> Value liftToJSONList2 :: (a -> Bool) -> (a -> Value) -> ([a] -> Value) -> (b -> Bool) -> (b -> Value) -> ([b] -> Value) -> [Either a b] -> Value liftToEncoding2 :: (a -> Bool) -> (a -> Encoding) -> ([a] -> Encoding) -> (b -> Bool) -> (b -> Encoding) -> ([b] -> Encoding) -> Either a b -> Encoding liftToEncodingList2 :: (a -> Bool) -> (a -> Encoding) -> ([a] -> Encoding) -> (b -> Bool) -> (b -> Encoding) -> ([b] -> Encoding) -> [Either a b] -> Encoding liftOmitField2 :: (a -> Bool) -> (b -> Bool) -> Either a b -> Bool
Bifunctor Either	Since: base-4.8.0.0
Instance details Defined in Data.Bifunctor Methods bimap :: (a -> b) -> (c -> d) -> Either a c -> Either b d Source # first :: (a -> b) -> Either a c -> Either b c Source # second :: (b -> c) -> Either a b -> Either a c Source #
NFData2 Either	Since: deepseq-1.4.3.0
Instance details Defined in Control.DeepSeq Methods liftRnf2 :: (a -> ()) -> (b -> ()) -> Either a b -> () Source #
Hashable2 Either
Instance details Defined in Data.Hashable.Class Methods liftHashWithSalt2 :: (Int -> a -> Int) -> (Int -> b -> Int) -> Int -> Either a b -> Int
Bitraversable1 Either
Instance details Defined in Data.Semigroup.Traversable.Class Methods bitraverse1 :: Apply f => (a -> f b) -> (c -> f d) -> Either a c -> f (Either b d) bisequence1 :: Apply f => Either (f a) (f b) -> f (Either a b)
Generic1 (Either a :: Type -> Type)
Instance details Defined in GHC.Generics Associated Types type Rep1 (Either a) :: k -> Type Source # Methods from1 :: forall (a0 :: k). Either a a0 -> Rep1 (Either a) a0 Source # to1 :: forall (a0 :: k). Rep1 (Either a) a0 -> Either a a0 Source #
MonadError e (Either e)
Instance details Defined in Control.Monad.Error.Class Methods throwError :: e -> Either e a Source # catchError :: Either e a -> (e -> Either e a) -> Either e a Source #
(Typeable DefaultUni a, Typeable DefaultUni b, Lift DefaultUni a, Lift DefaultUni b) => Lift DefaultUni (Either a b) Source #
Instance details Defined in PlutusTx.Lift.Instances Methods lift :: Either a b -> RTCompile DefaultUni fun (Term TyName Name DefaultUni fun ()) Source #
(Lift a, Lift b) => Lift (Either a b :: Type)
Instance details Defined in Language.Haskell.TH.Syntax Methods lift :: Quote m => Either a b -> m Exp Source # liftTyped :: forall (m :: Type -> Type). Quote m => Either a b -> Code m (Either a b) Source #
FromJSON a => FromJSON1 (Either a)
Instance details Defined in Data.Aeson.Types.FromJSON Methods liftParseJSON :: Maybe a0 -> (Value -> Parser a0) -> (Value -> Parser [a0]) -> Value -> Parser (Either a a0) liftParseJSONList :: Maybe a0 -> (Value -> Parser a0) -> (Value -> Parser [a0]) -> Value -> Parser [Either a a0] liftOmittedField :: Maybe a0 -> Maybe (Either a a0)
ToJSON a => ToJSON1 (Either a)
Instance details Defined in Data.Aeson.Types.ToJSON Methods liftToJSON :: (a0 -> Bool) -> (a0 -> Value) -> ([a0] -> Value) -> Either a a0 -> Value liftToJSONList :: (a0 -> Bool) -> (a0 -> Value) -> ([a0] -> Value) -> [Either a a0] -> Value liftToEncoding :: (a0 -> Bool) -> (a0 -> Encoding) -> ([a0] -> Encoding) -> Either a a0 -> Encoding liftToEncodingList :: (a0 -> Bool) -> (a0 -> Encoding) -> ([a0] -> Encoding) -> [Either a a0] -> Encoding liftOmitField :: (a0 -> Bool) -> Either a a0 -> Bool
Foldable (Either a)	Since: base-4.7.0.0
Instance details Defined in Data.Foldable Methods fold :: Monoid m => Either a m -> m Source # foldMap :: Monoid m => (a0 -> m) -> Either a a0 -> m Source # foldMap' :: Monoid m => (a0 -> m) -> Either a a0 -> m Source # foldr :: (a0 -> b -> b) -> b -> Either a a0 -> b Source # foldr' :: (a0 -> b -> b) -> b -> Either a a0 -> b Source # foldl :: (b -> a0 -> b) -> b -> Either a a0 -> b Source # foldl' :: (b -> a0 -> b) -> b -> Either a a0 -> b Source # foldr1 :: (a0 -> a0 -> a0) -> Either a a0 -> a0 Source # foldl1 :: (a0 -> a0 -> a0) -> Either a a0 -> a0 Source # toList :: Either a a0 -> [a0] Source # null :: Either a a0 -> Bool Source # length :: Either a a0 -> Int Source # elem :: Eq a0 => a0 -> Either a a0 -> Bool Source # maximum :: Ord a0 => Either a a0 -> a0 Source # minimum :: Ord a0 => Either a a0 -> a0 Source # sum :: Num a0 => Either a a0 -> a0 Source # product :: Num a0 => Either a a0 -> a0 Source #
Traversable (Either a)	Since: base-4.7.0.0
Instance details Defined in Data.Traversable Methods traverse :: Applicative f => (a0 -> f b) -> Either a a0 -> f (Either a b) Source # sequenceA :: Applicative f => Either a (f a0) -> f (Either a a0) Source # mapM :: Monad m => (a0 -> m b) -> Either a a0 -> m (Either a b) Source # sequence :: Monad m => Either a (m a0) -> m (Either a a0) Source #
Applicative (Either e)	Since: base-3.0
Instance details Defined in Data.Either Methods pure :: a -> Either e a Source # (<>) :: Either e (a -> b) -> Either e a -> Either e b Source # liftA2 :: (a -> b -> c) -> Either e a -> Either e b -> Either e c Source # (>) :: Either e a -> Either e b -> Either e b Source # (<*) :: Either e a -> Either e b -> Either e a Source #
Functor (Either a)	Since: base-3.0
Instance details Defined in Data.Either Methods fmap :: (a0 -> b) -> Either a a0 -> Either a b Source # (<$) :: a0 -> Either a b -> Either a a0 Source #
Monad (Either e)	Since: base-4.4.0.0
Instance details Defined in Data.Either Methods (>>=) :: Either e a -> (a -> Either e b) -> Either e b Source # (>>) :: Either e a -> Either e b -> Either e b Source # return :: a -> Either e a Source #
MonadFailure (Either a)
Instance details Defined in Basement.Monad Associated Types type Failure (Either a) Methods mFail :: Failure (Either a) -> Either a ()
NFData a => NFData1 (Either a)	Since: deepseq-1.4.3.0
Instance details Defined in Control.DeepSeq Methods liftRnf :: (a0 -> ()) -> Either a a0 -> () Source #
Hashable a => Hashable1 (Either a)
Instance details Defined in Data.Hashable.Class Methods liftHashWithSalt :: (Int -> a0 -> Int) -> Int -> Either a a0 -> Int
Applicative (Either a) Source #
Instance details Defined in PlutusTx.Applicative Methods pure :: a0 -> Either a a0 Source # (<*>) :: Either a (a0 -> b) -> Either a a0 -> Either a b Source #
Foldable (Either c) Source #
Instance details Defined in PlutusTx.Foldable Methods foldr :: (a -> b -> b) -> b -> Either c a -> b Source #
Functor (Either c) Source #
Instance details Defined in PlutusTx.Functor Methods fmap :: (a -> b) -> Either c a -> Either c b Source #
Traversable (Either c) Source #
Instance details Defined in PlutusTx.Traversable Methods traverse :: Applicative f => (a -> f b) -> Either c a -> f (Either c b) Source #
MonadBaseControl (Either e) (Either e)
Instance details Defined in Control.Monad.Trans.Control Associated Types type StM (Either e) a Methods liftBaseWith :: (RunInBase (Either e) (Either e) -> Either e a) -> Either e a restoreM :: StM (Either e) a -> Either e a
(FromJSON a, FromJSON b) => FromJSON (Either a b)
Instance details Defined in Data.Aeson.Types.FromJSON Methods parseJSON :: Value -> Parser (Either a b) parseJSONList :: Value -> Parser [Either a b] omittedField :: Maybe (Either a b)
(ToJSON a, ToJSON b) => ToJSON (Either a b)
Instance details Defined in Data.Aeson.Types.ToJSON Methods toJSON :: Either a b -> Value toEncoding :: Either a b -> Encoding toJSONList :: [Either a b] -> Value toEncodingList :: [Either a b] -> Encoding omitField :: Either a b -> Bool
(Data a, Data b) => Data (Either a b)	Since: base-4.0.0.0
Instance details Defined in Data.Data Methods gfoldl :: (forall d b0. Data d => c (d -> b0) -> d -> c b0) -> (forall g. g -> c g) -> Either a b -> c (Either a b) Source # gunfold :: (forall b0 r. Data b0 => c (b0 -> r) -> c r) -> (forall r. r -> c r) -> Constr -> c (Either a b) Source # toConstr :: Either a b -> Constr Source # dataTypeOf :: Either a b -> DataType Source # dataCast1 :: Typeable t => (forall d. Data d => c (t d)) -> Maybe (c (Either a b)) Source # dataCast2 :: Typeable t => (forall d e. (Data d, Data e) => c (t d e)) -> Maybe (c (Either a b)) Source # gmapT :: (forall b0. Data b0 => b0 -> b0) -> Either a b -> Either a b Source # gmapQl :: (r -> r' -> r) -> r -> (forall d. Data d => d -> r') -> Either a b -> r Source # gmapQr :: forall r r'. (r' -> r -> r) -> r -> (forall d. Data d => d -> r') -> Either a b -> r Source # gmapQ :: (forall d. Data d => d -> u) -> Either a b -> [u] Source # gmapQi :: Int -> (forall d. Data d => d -> u) -> Either a b -> u Source # gmapM :: Monad m => (forall d. Data d => d -> m d) -> Either a b -> m (Either a b) Source # gmapMp :: MonadPlus m => (forall d. Data d => d -> m d) -> Either a b -> m (Either a b) Source # gmapMo :: MonadPlus m => (forall d. Data d => d -> m d) -> Either a b -> m (Either a b) Source #
Semigroup (Either a b)	Since: base-4.9.0.0
Instance details Defined in Data.Either Methods (<>) :: Either a b -> Either a b -> Either a b Source # sconcat :: NonEmpty (Either a b) -> Either a b Source # stimes :: Integral b0 => b0 -> Either a b -> Either a b Source #
Generic (Either a b)
Instance details Defined in GHC.Generics Associated Types type Rep (Either a b) :: Type -> Type Source # Methods from :: Either a b -> Rep (Either a b) x Source # to :: Rep (Either a b) x -> Either a b Source #
(Read a, Read b) => Read (Either a b)	Since: base-3.0
Instance details Defined in Data.Either Methods readsPrec :: Int -> ReadS (Either a b) Source # readList :: ReadS [Either a b] Source # readPrec :: ReadPrec (Either a b) Source # readListPrec :: ReadPrec [Either a b] Source #
(Show a, Show b) => Show (Either a b)	Since: base-3.0
Instance details Defined in Data.Either Methods showsPrec :: Int -> Either a b -> ShowS Source # show :: Either a b -> String Source # showList :: [Either a b] -> ShowS Source #
(NFData a, NFData b) => NFData (Either a b)
Instance details Defined in Control.DeepSeq Methods rnf :: Either a b -> () Source #
(Eq a, Eq b) => Eq (Either a b)	Since: base-2.1
Instance details Defined in Data.Either Methods (==) :: Either a b -> Either a b -> Bool Source # (/=) :: Either a b -> Either a b -> Bool Source #
(Ord a, Ord b) => Ord (Either a b)	Since: base-2.1
Instance details Defined in Data.Either Methods compare :: Either a b -> Either a b -> Ordering Source # (<) :: Either a b -> Either a b -> Bool Source # (<=) :: Either a b -> Either a b -> Bool Source # (>) :: Either a b -> Either a b -> Bool Source # (>=) :: Either a b -> Either a b -> Bool Source # max :: Either a b -> Either a b -> Either a b Source # min :: Either a b -> Either a b -> Either a b Source #
(Hashable a, Hashable b) => Hashable (Either a b)
Instance details Defined in Data.Hashable.Class Methods hashWithSalt :: Int -> Either a b -> Int hash :: Either a b -> Int
MonoFoldable (Either a b)
Instance details Defined in Data.MonoTraversable Methods ofoldMap :: Monoid m => (Element (Either a b) -> m) -> Either a b -> m ofoldr :: (Element (Either a b) -> b0 -> b0) -> b0 -> Either a b -> b0 ofoldl' :: (a0 -> Element (Either a b) -> a0) -> a0 -> Either a b -> a0 otoList :: Either a b -> [Element (Either a b)] oall :: (Element (Either a b) -> Bool) -> Either a b -> Bool oany :: (Element (Either a b) -> Bool) -> Either a b -> Bool onull :: Either a b -> Bool olength :: Either a b -> Int olength64 :: Either a b -> Int64 ocompareLength :: Integral i => Either a b -> i -> Ordering otraverse_ :: Applicative f => (Element (Either a b) -> f b0) -> Either a b -> f () ofor_ :: Applicative f => Either a b -> (Element (Either a b) -> f b0) -> f () omapM_ :: Applicative m => (Element (Either a b) -> m ()) -> Either a b -> m () oforM_ :: Applicative m => Either a b -> (Element (Either a b) -> m ()) -> m () ofoldlM :: Monad m => (a0 -> Element (Either a b) -> m a0) -> a0 -> Either a b -> m a0 ofoldMap1Ex :: Semigroup m => (Element (Either a b) -> m) -> Either a b -> m ofoldr1Ex :: (Element (Either a b) -> Element (Either a b) -> Element (Either a b)) -> Either a b -> Element (Either a b) ofoldl1Ex' :: (Element (Either a b) -> Element (Either a b) -> Element (Either a b)) -> Either a b -> Element (Either a b) headEx :: Either a b -> Element (Either a b) lastEx :: Either a b -> Element (Either a b) unsafeHead :: Either a b -> Element (Either a b) unsafeLast :: Either a b -> Element (Either a b) maximumByEx :: (Element (Either a b) -> Element (Either a b) -> Ordering) -> Either a b -> Element (Either a b) minimumByEx :: (Element (Either a b) -> Element (Either a b) -> Ordering) -> Either a b -> Element (Either a b) oelem :: Element (Either a b) -> Either a b -> Bool onotElem :: Element (Either a b) -> Either a b -> Bool
MonoFunctor (Either a b)
Instance details Defined in Data.MonoTraversable Methods omap :: (Element (Either a b) -> Element (Either a b)) -> Either a b -> Either a b
MonoPointed (Either a b)
Instance details Defined in Data.MonoTraversable Methods opoint :: Element (Either a b) -> Either a b
MonoTraversable (Either a b)
Instance details Defined in Data.MonoTraversable Methods otraverse :: Applicative f => (Element (Either a b) -> f (Element (Either a b))) -> Either a b -> f (Either a b) omapM :: Applicative m => (Element (Either a b) -> m (Element (Either a b))) -> Either a b -> m (Either a b)
(Eq a, Eq b) => Eq (Either a b) Source #
Instance details Defined in PlutusTx.Eq Methods (==) :: Either a b -> Either a b -> Bool Source #
(FromData a, FromData b) => FromData (Either a b) Source #
Instance details Defined in PlutusTx.IsData.Instances Methods fromBuiltinData :: BuiltinData -> Maybe (Either a b) Source #
(ToData a, ToData b) => ToData (Either a b) Source #
Instance details Defined in PlutusTx.IsData.Instances Methods toBuiltinData :: Either a b -> BuiltinData Source #
(UnsafeFromData a, UnsafeFromData b) => UnsafeFromData (Either a b) Source #
Instance details Defined in PlutusTx.IsData.Instances Methods unsafeFromBuiltinData :: BuiltinData -> Either a b Source #
(Ord a, Ord b) => Ord (Either a b) Source #
Instance details Defined in PlutusTx.Ord Methods compare :: Either a b -> Either a b -> Ordering Source # (<) :: Either a b -> Either a b -> Bool Source # (<=) :: Either a b -> Either a b -> Bool Source # (>) :: Either a b -> Either a b -> Bool Source # (>=) :: Either a b -> Either a b -> Bool Source # max :: Either a b -> Either a b -> Either a b Source # min :: Either a b -> Either a b -> Either a b Source #
(Show a, Show b) => Show (Either a b) Source #
Instance details Defined in PlutusTx.Show Methods showsPrec :: Integer -> Either a b -> ShowS Source # show :: Either a b -> BuiltinString Source #
Corecursive (Either a b)
Instance details Defined in Data.Functor.Foldable Methods embed :: Base (Either a b) (Either a b) -> Either a b ana :: (a0 -> Base (Either a b) a0) -> a0 -> Either a b apo :: (a0 -> Base (Either a b) (Either (Either a b) a0)) -> a0 -> Either a b postpro :: Recursive (Either a b) => (forall b0. Base (Either a b) b0 -> Base (Either a b) b0) -> (a0 -> Base (Either a b) a0) -> a0 -> Either a b gpostpro :: (Recursive (Either a b), Monad m) => (forall b0. m (Base (Either a b) b0) -> Base (Either a b) (m b0)) -> (forall c. Base (Either a b) c -> Base (Either a b) c) -> (a0 -> Base (Either a b) (m a0)) -> a0 -> Either a b
Recursive (Either a b)
Instance details Defined in Data.Functor.Foldable Methods project :: Either a b -> Base (Either a b) (Either a b) cata :: (Base (Either a b) a0 -> a0) -> Either a b -> a0 para :: (Base (Either a b) (Either a b, a0) -> a0) -> Either a b -> a0 gpara :: (Corecursive (Either a b), Comonad w) => (forall b0. Base (Either a b) (w b0) -> w (Base (Either a b) b0)) -> (Base (Either a b) (EnvT (Either a b) w a0) -> a0) -> Either a b -> a0 prepro :: Corecursive (Either a b) => (forall b0. Base (Either a b) b0 -> Base (Either a b) b0) -> (Base (Either a b) a0 -> a0) -> Either a b -> a0 gprepro :: (Corecursive (Either a b), Comonad w) => (forall b0. Base (Either a b) (w b0) -> w (Base (Either a b) b0)) -> (forall c. Base (Either a b) c -> Base (Either a b) c) -> (Base (Either a b) (w a0) -> a0) -> Either a b -> a0
(Serialise a, Serialise b) => Serialise (Either a b)
Instance details Defined in Codec.Serialise.Class Methods encode :: Either a b -> Encoding decode :: Decoder s (Either a b) encodeList :: [Either a b] -> Encoding decodeList :: Decoder s [Either a b]
(HasBlueprintDefinition a, HasSchemaDefinition a referencedTypes, HasBlueprintDefinition b, HasSchemaDefinition b referencedTypes) => HasBlueprintSchema (Either a b) referencedTypes Source #
Instance details Defined in PlutusTx.IsData.Instances Methods schema :: Schema referencedTypes Source #
Typeable DefaultUni Either Source #
Instance details Defined in PlutusTx.Lift.Instances Methods typeRep :: Proxy Either -> RTCompile DefaultUni fun (Type TyName DefaultUni ()) Source #
(a ~ a', b ~ b') => Each (Either a a') (Either b b') a b
Instance details Defined in Control.Lens.Each Methods each :: Traversal (Either a a') (Either b b') a b
(a ~ a', b ~ b') => Each (Either a a') (Either b b') a b
Instance details Defined in Lens.Micro.Internal Methods each :: Traversal (Either a a') (Either b b') a b
(FoldableWithIndex i f, FoldableWithIndex j g) => FoldableWithIndex (Either i j) (Product f g)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Either i j -> a -> m) -> Product f g a -> m ifoldMap' :: Monoid m => (Either i j -> a -> m) -> Product f g a -> m ifoldr :: (Either i j -> a -> b -> b) -> b -> Product f g a -> b ifoldl :: (Either i j -> b -> a -> b) -> b -> Product f g a -> b ifoldr' :: (Either i j -> a -> b -> b) -> b -> Product f g a -> b ifoldl' :: (Either i j -> b -> a -> b) -> b -> Product f g a -> b
(FoldableWithIndex i f, FoldableWithIndex j g) => FoldableWithIndex (Either i j) (Sum f g)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Either i j -> a -> m) -> Sum f g a -> m ifoldMap' :: Monoid m => (Either i j -> a -> m) -> Sum f g a -> m ifoldr :: (Either i j -> a -> b -> b) -> b -> Sum f g a -> b ifoldl :: (Either i j -> b -> a -> b) -> b -> Sum f g a -> b ifoldr' :: (Either i j -> a -> b -> b) -> b -> Sum f g a -> b ifoldl' :: (Either i j -> b -> a -> b) -> b -> Sum f g a -> b
(FoldableWithIndex i f, FoldableWithIndex j g) => FoldableWithIndex (Either i j) (f :*: g)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Either i j -> a -> m) -> (f :: g) a -> m ifoldMap' :: Monoid m => (Either i j -> a -> m) -> (f :: g) a -> m ifoldr :: (Either i j -> a -> b -> b) -> b -> (f :: g) a -> b ifoldl :: (Either i j -> b -> a -> b) -> b -> (f :: g) a -> b ifoldr' :: (Either i j -> a -> b -> b) -> b -> (f :: g) a -> b ifoldl' :: (Either i j -> b -> a -> b) -> b -> (f :: g) a -> b
(FoldableWithIndex i f, FoldableWithIndex j g) => FoldableWithIndex (Either i j) (f :+: g)
Instance details Defined in WithIndex Methods ifoldMap :: Monoid m => (Either i j -> a -> m) -> (f :+: g) a -> m ifoldMap' :: Monoid m => (Either i j -> a -> m) -> (f :+: g) a -> m ifoldr :: (Either i j -> a -> b -> b) -> b -> (f :+: g) a -> b ifoldl :: (Either i j -> b -> a -> b) -> b -> (f :+: g) a -> b ifoldr' :: (Either i j -> a -> b -> b) -> b -> (f :+: g) a -> b ifoldl' :: (Either i j -> b -> a -> b) -> b -> (f :+: g) a -> b
(FunctorWithIndex i f, FunctorWithIndex j g) => FunctorWithIndex (Either i j) (Product f g)
Instance details Defined in WithIndex Methods imap :: (Either i j -> a -> b) -> Product f g a -> Product f g b
(FunctorWithIndex i f, FunctorWithIndex j g) => FunctorWithIndex (Either i j) (Sum f g)
Instance details Defined in WithIndex Methods imap :: (Either i j -> a -> b) -> Sum f g a -> Sum f g b
(FunctorWithIndex i f, FunctorWithIndex j g) => FunctorWithIndex (Either i j) (f :*: g)
Instance details Defined in WithIndex Methods imap :: (Either i j -> a -> b) -> (f :: g) a -> (f :: g) b
(FunctorWithIndex i f, FunctorWithIndex j g) => FunctorWithIndex (Either i j) (f :+: g)
Instance details Defined in WithIndex Methods imap :: (Either i j -> a -> b) -> (f :+: g) a -> (f :+: g) b
(TraversableWithIndex i f, TraversableWithIndex j g) => TraversableWithIndex (Either i j) (Product f g)
Instance details Defined in WithIndex Methods itraverse :: Applicative f0 => (Either i j -> a -> f0 b) -> Product f g a -> f0 (Product f g b)
(TraversableWithIndex i f, TraversableWithIndex j g) => TraversableWithIndex (Either i j) (Sum f g)
Instance details Defined in WithIndex Methods itraverse :: Applicative f0 => (Either i j -> a -> f0 b) -> Sum f g a -> f0 (Sum f g b)
(TraversableWithIndex i f, TraversableWithIndex j g) => TraversableWithIndex (Either i j) (f :*: g)
Instance details Defined in WithIndex Methods itraverse :: Applicative f0 => (Either i j -> a -> f0 b) -> (f :: g) a -> f0 ((f :: g) b)
(TraversableWithIndex i f, TraversableWithIndex j g) => TraversableWithIndex (Either i j) (f :+: g)
Instance details Defined in WithIndex Methods itraverse :: Applicative f0 => (Either i j -> a -> f0 b) -> (f :+: g) a -> f0 ((f :+: g) b)
type Rep1 (Either a :: Type -> Type)	Since: base-4.6.0.0
Instance details Defined in GHC.Generics type Rep1 (Either a :: Type -> Type) = D1 ('MetaData "Either" "Data.Either" "base" 'False) (C1 ('MetaCons "Left" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 a)) :+: C1 ('MetaCons "Right" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) Par1))
type Failure (Either a)
Instance details Defined in Basement.Monad type Failure (Either a) = a
type StM (Either e) a
Instance details Defined in Control.Monad.Trans.Control type StM (Either e) a = a
type Rep (Either a b)	Since: base-4.6.0.0
Instance details Defined in GHC.Generics type Rep (Either a b) = D1 ('MetaData "Either" "Data.Either" "base" 'False) (C1 ('MetaCons "Left" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 a)) :+: C1 ('MetaCons "Right" 'PrefixI 'False) (S1 ('MetaSel ('Nothing :: Maybe Symbol) 'NoSourceUnpackedness 'NoSourceStrictness 'DecidedLazy) (Rec0 b)))
type Element (Either a b)
Instance details Defined in Data.MonoTraversable type Element (Either a b) = b
type Base (Either a b)
Instance details Defined in Data.Functor.Foldable type Base (Either a b) = Const (Either a b) :: Type -> Type

isLeft :: Either a b -> Bool Source #

Return True if the given value is a Left-value, False otherwise.

isRight :: Either a b -> Bool Source #

Return True if the given value is a Right-value, False otherwise.

either :: (a -> c) -> (b -> c) -> Either a b -> c Source #

Plutus Tx version of either