Copyright	(C) 2011-2015 Edward Kmett
License	BSD-style (see the file LICENSE)
Maintainer	Edward Kmett <ekmett@gmail.com>
Stability	provisional
Portability	portable
Safe Haskell	Safe
Language	Haskell2010

Data.Semigroup.Foldable

Description

Re-exports a subset of the Data.Foldable1 module along with some additional combinators that require Foldable1 constraints.

Synopsis

class Foldable t => Foldable1 (t :: Type -> Type) where
- fold1 :: Semigroup m => t m -> m
- foldMap1 :: Semigroup m => (a -> m) -> t a -> m
- toNonEmpty :: t a -> NonEmpty a
intercalate1 :: (Foldable1 t, Semigroup m) => m -> t m -> m
foldrM1 :: (Foldable1 t, Monad m) => (a -> a -> m a) -> t a -> m a
foldlM1 :: (Foldable1 t, Monad m) => (a -> a -> m a) -> t a -> m a
intercalateMap1 :: (Foldable1 t, Semigroup m) => m -> (a -> m) -> t a -> m
traverse1_ :: (Foldable1 t, Apply f) => (a -> f b) -> t a -> f ()
for1_ :: (Foldable1 t, Apply f) => t a -> (a -> f b) -> f ()
sequenceA1_ :: (Foldable1 t, Apply f) => t (f a) -> f ()
foldMapDefault1 :: (Foldable1 t, Monoid m) => (a -> m) -> t a -> m
asum1 :: (Foldable1 t, Alt m) => t (m a) -> m a
gfold1 :: (Foldable1 (Rep1 t), Generic1 t, Semigroup m) => t m -> m
gfoldMap1 :: (Foldable1 (Rep1 t), Generic1 t, Semigroup m) => (a -> m) -> t a -> m
gtoNonEmpty :: (Foldable1 (Rep1 t), Generic1 t) => t a -> NonEmpty a

Documentation

class Foldable t => Foldable1 (t :: Type -> Type) where #

Non-empty data structures that can be folded.

Since: base-4.18.0.0

Minimal complete definition

foldMap1 | foldrMap1

Methods

fold1 :: Semigroup m => t m -> m #

Given a structure with elements whose type is a Semigroup, combine them via the semigroup's (<>) operator. This fold is right-associative and lazy in the accumulator. When you need a strict left-associative fold, use foldMap1' instead, with id as the map.

Since: base-4.18.0.0

foldMap1 :: Semigroup m => (a -> m) -> t a -> m #

Map each element of the structure to a semigroup, and combine the results with (<>). This fold is right-associative and lazy in the accumulator. For strict left-associative folds consider foldMap1' instead.

>>> foldMap1 (:[]) (1 :| [2, 3, 4])
[1,2,3,4]

Since: base-4.18.0.0

toNonEmpty :: t a -> NonEmpty a #

NonEmpty list of elements of a structure, from left to right.

>>> toNonEmpty (Identity 2)
2 :| []

Since: base-4.18.0.0

Instances

Instances details

Foldable1 Complex	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Complex m -> m # foldMap1 :: Semigroup m => (a -> m) -> Complex a -> m # foldMap1' :: Semigroup m => (a -> m) -> Complex a -> m # toNonEmpty :: Complex a -> NonEmpty a # maximum :: Ord a => Complex a -> a # minimum :: Ord a => Complex a -> a # head :: Complex a -> a # last :: Complex a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Complex a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Complex a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Complex a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Complex a -> b #
Foldable1 Identity	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Identity m -> m # foldMap1 :: Semigroup m => (a -> m) -> Identity a -> m # foldMap1' :: Semigroup m => (a -> m) -> Identity a -> m # toNonEmpty :: Identity a -> NonEmpty a # maximum :: Ord a => Identity a -> a # minimum :: Ord a => Identity a -> a # head :: Identity a -> a # last :: Identity a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Identity a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Identity a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Identity a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Identity a -> b #
Foldable1 Down	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Down m -> m # foldMap1 :: Semigroup m => (a -> m) -> Down a -> m # foldMap1' :: Semigroup m => (a -> m) -> Down a -> m # toNonEmpty :: Down a -> NonEmpty a # maximum :: Ord a => Down a -> a # minimum :: Ord a => Down a -> a # head :: Down a -> a # last :: Down a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Down a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Down a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Down a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Down a -> b #
Foldable1 First	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => First m -> m # foldMap1 :: Semigroup m => (a -> m) -> First a -> m # foldMap1' :: Semigroup m => (a -> m) -> First a -> m # toNonEmpty :: First a -> NonEmpty a # maximum :: Ord a => First a -> a # minimum :: Ord a => First a -> a # head :: First a -> a # last :: First a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> First a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> First a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> First a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> First a -> b #
Foldable1 Last	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Last m -> m # foldMap1 :: Semigroup m => (a -> m) -> Last a -> m # foldMap1' :: Semigroup m => (a -> m) -> Last a -> m # toNonEmpty :: Last a -> NonEmpty a # maximum :: Ord a => Last a -> a # minimum :: Ord a => Last a -> a # head :: Last a -> a # last :: Last a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Last a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Last a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Last a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Last a -> b #
Foldable1 Max	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Max m -> m # foldMap1 :: Semigroup m => (a -> m) -> Max a -> m # foldMap1' :: Semigroup m => (a -> m) -> Max a -> m # toNonEmpty :: Max a -> NonEmpty a # maximum :: Ord a => Max a -> a # minimum :: Ord a => Max a -> a # head :: Max a -> a # last :: Max a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Max a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Max a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Max a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Max a -> b #
Foldable1 Min	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Min m -> m # foldMap1 :: Semigroup m => (a -> m) -> Min a -> m # foldMap1' :: Semigroup m => (a -> m) -> Min a -> m # toNonEmpty :: Min a -> NonEmpty a # maximum :: Ord a => Min a -> a # minimum :: Ord a => Min a -> a # head :: Min a -> a # last :: Min a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Min a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Min a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Min a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Min a -> b #
Foldable1 Dual	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Dual m -> m # foldMap1 :: Semigroup m => (a -> m) -> Dual a -> m # foldMap1' :: Semigroup m => (a -> m) -> Dual a -> m # toNonEmpty :: Dual a -> NonEmpty a # maximum :: Ord a => Dual a -> a # minimum :: Ord a => Dual a -> a # head :: Dual a -> a # last :: Dual a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Dual a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Dual a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Dual a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Dual a -> b #
Foldable1 Product	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Product m -> m # foldMap1 :: Semigroup m => (a -> m) -> Product a -> m # foldMap1' :: Semigroup m => (a -> m) -> Product a -> m # toNonEmpty :: Product a -> NonEmpty a # maximum :: Ord a => Product a -> a # minimum :: Ord a => Product a -> a # head :: Product a -> a # last :: Product a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Product a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Product a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Product a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Product a -> b #
Foldable1 Sum	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Sum m -> m # foldMap1 :: Semigroup m => (a -> m) -> Sum a -> m # foldMap1' :: Semigroup m => (a -> m) -> Sum a -> m # toNonEmpty :: Sum a -> NonEmpty a # maximum :: Ord a => Sum a -> a # minimum :: Ord a => Sum a -> a # head :: Sum a -> a # last :: Sum a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Sum a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Sum a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Sum a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Sum a -> b #
Foldable1 NonEmpty	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => NonEmpty m -> m # foldMap1 :: Semigroup m => (a -> m) -> NonEmpty a -> m # foldMap1' :: Semigroup m => (a -> m) -> NonEmpty a -> m # toNonEmpty :: NonEmpty a -> NonEmpty a # maximum :: Ord a => NonEmpty a -> a # minimum :: Ord a => NonEmpty a -> a # head :: NonEmpty a -> a # last :: NonEmpty a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> NonEmpty a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> NonEmpty a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> NonEmpty a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> NonEmpty a -> b #
Foldable1 Par1	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Par1 m -> m # foldMap1 :: Semigroup m => (a -> m) -> Par1 a -> m # foldMap1' :: Semigroup m => (a -> m) -> Par1 a -> m # toNonEmpty :: Par1 a -> NonEmpty a # maximum :: Ord a => Par1 a -> a # minimum :: Ord a => Par1 a -> a # head :: Par1 a -> a # last :: Par1 a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Par1 a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Par1 a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Par1 a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Par1 a -> b #
Foldable1 Tree	Folds in preorder Since: containers-0.6.7
Instance details Defined in Data.Tree Methods fold1 :: Semigroup m => Tree m -> m # foldMap1 :: Semigroup m => (a -> m) -> Tree a -> m # foldMap1' :: Semigroup m => (a -> m) -> Tree a -> m # toNonEmpty :: Tree a -> NonEmpty a # maximum :: Ord a => Tree a -> a # minimum :: Ord a => Tree a -> a # head :: Tree a -> a # last :: Tree a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Tree a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Tree a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Tree a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Tree a -> b #
Foldable1 Solo	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Solo m -> m # foldMap1 :: Semigroup m => (a -> m) -> Solo a -> m # foldMap1' :: Semigroup m => (a -> m) -> Solo a -> m # toNonEmpty :: Solo a -> NonEmpty a # maximum :: Ord a => Solo a -> a # minimum :: Ord a => Solo a -> a # head :: Solo a -> a # last :: Solo a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Solo a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Solo a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Solo a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Solo a -> b #
Foldable1 (V1 :: Type -> Type)	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => V1 m -> m # foldMap1 :: Semigroup m => (a -> m) -> V1 a -> m # foldMap1' :: Semigroup m => (a -> m) -> V1 a -> m # toNonEmpty :: V1 a -> NonEmpty a # maximum :: Ord a => V1 a -> a # minimum :: Ord a => V1 a -> a # head :: V1 a -> a # last :: V1 a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> V1 a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> V1 a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> V1 a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> V1 a -> b #
Foldable1 f => Foldable1 (Lift f)
Instance details Defined in Control.Applicative.Lift Methods fold1 :: Semigroup m => Lift f m -> m # foldMap1 :: Semigroup m => (a -> m) -> Lift f a -> m # foldMap1' :: Semigroup m => (a -> m) -> Lift f a -> m # toNonEmpty :: Lift f a -> NonEmpty a # maximum :: Ord a => Lift f a -> a # minimum :: Ord a => Lift f a -> a # head :: Lift f a -> a # last :: Lift f a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Lift f a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Lift f a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Lift f a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Lift f a -> b #
Foldable1 ((,) a)	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => (a, m) -> m # foldMap1 :: Semigroup m => (a0 -> m) -> (a, a0) -> m # foldMap1' :: Semigroup m => (a0 -> m) -> (a, a0) -> m # toNonEmpty :: (a, a0) -> NonEmpty a0 # maximum :: Ord a0 => (a, a0) -> a0 # minimum :: Ord a0 => (a, a0) -> a0 # head :: (a, a0) -> a0 # last :: (a, a0) -> a0 # foldrMap1 :: (a0 -> b) -> (a0 -> b -> b) -> (a, a0) -> b # foldlMap1' :: (a0 -> b) -> (b -> a0 -> b) -> (a, a0) -> b # foldlMap1 :: (a0 -> b) -> (b -> a0 -> b) -> (a, a0) -> b # foldrMap1' :: (a0 -> b) -> (a0 -> b -> b) -> (a, a0) -> b #
Foldable1 f => Foldable1 (Ap f)	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Ap f m -> m # foldMap1 :: Semigroup m => (a -> m) -> Ap f a -> m # foldMap1' :: Semigroup m => (a -> m) -> Ap f a -> m # toNonEmpty :: Ap f a -> NonEmpty a # maximum :: Ord a => Ap f a -> a # minimum :: Ord a => Ap f a -> a # head :: Ap f a -> a # last :: Ap f a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Ap f a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Ap f a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Ap f a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Ap f a -> b #
Foldable1 f => Foldable1 (Alt f)	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Alt f m -> m # foldMap1 :: Semigroup m => (a -> m) -> Alt f a -> m # foldMap1' :: Semigroup m => (a -> m) -> Alt f a -> m # toNonEmpty :: Alt f a -> NonEmpty a # maximum :: Ord a => Alt f a -> a # minimum :: Ord a => Alt f a -> a # head :: Alt f a -> a # last :: Alt f a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Alt f a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Alt f a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Alt f a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Alt f a -> b #
Foldable1 f => Foldable1 (Rec1 f)	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Rec1 f m -> m # foldMap1 :: Semigroup m => (a -> m) -> Rec1 f a -> m # foldMap1' :: Semigroup m => (a -> m) -> Rec1 f a -> m # toNonEmpty :: Rec1 f a -> NonEmpty a # maximum :: Ord a => Rec1 f a -> a # minimum :: Ord a => Rec1 f a -> a # head :: Rec1 f a -> a # last :: Rec1 f a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Rec1 f a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Rec1 f a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Rec1 f a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Rec1 f a -> b #
Bifoldable1 p => Foldable1 (Join p)
Instance details Defined in Data.Bifunctor.Join Methods fold1 :: Semigroup m => Join p m -> m # foldMap1 :: Semigroup m => (a -> m) -> Join p a -> m # foldMap1' :: Semigroup m => (a -> m) -> Join p a -> m # toNonEmpty :: Join p a -> NonEmpty a # maximum :: Ord a => Join p a -> a # minimum :: Ord a => Join p a -> a # head :: Join p a -> a # last :: Join p a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Join p a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Join p a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Join p a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Join p a -> b #
Foldable1 (Tagged a)
Instance details Defined in Data.Tagged Methods fold1 :: Semigroup m => Tagged a m -> m # foldMap1 :: Semigroup m => (a0 -> m) -> Tagged a a0 -> m # foldMap1' :: Semigroup m => (a0 -> m) -> Tagged a a0 -> m # toNonEmpty :: Tagged a a0 -> NonEmpty a0 # maximum :: Ord a0 => Tagged a a0 -> a0 # minimum :: Ord a0 => Tagged a a0 -> a0 # head :: Tagged a a0 -> a0 # last :: Tagged a a0 -> a0 # foldrMap1 :: (a0 -> b) -> (a0 -> b -> b) -> Tagged a a0 -> b # foldlMap1' :: (a0 -> b) -> (b -> a0 -> b) -> Tagged a a0 -> b # foldlMap1 :: (a0 -> b) -> (b -> a0 -> b) -> Tagged a a0 -> b # foldrMap1' :: (a0 -> b) -> (a0 -> b -> b) -> Tagged a a0 -> b #
Foldable1 f => Foldable1 (Backwards f)	Derived instance.
Instance details Defined in Control.Applicative.Backwards Methods fold1 :: Semigroup m => Backwards f m -> m # foldMap1 :: Semigroup m => (a -> m) -> Backwards f a -> m # foldMap1' :: Semigroup m => (a -> m) -> Backwards f a -> m # toNonEmpty :: Backwards f a -> NonEmpty a # maximum :: Ord a => Backwards f a -> a # minimum :: Ord a => Backwards f a -> a # head :: Backwards f a -> a # last :: Backwards f a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Backwards f a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Backwards f a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Backwards f a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Backwards f a -> b #
Foldable1 m => Foldable1 (IdentityT m)
Instance details Defined in Control.Monad.Trans.Identity Methods fold1 :: Semigroup m0 => IdentityT m m0 -> m0 # foldMap1 :: Semigroup m0 => (a -> m0) -> IdentityT m a -> m0 # foldMap1' :: Semigroup m0 => (a -> m0) -> IdentityT m a -> m0 # toNonEmpty :: IdentityT m a -> NonEmpty a # maximum :: Ord a => IdentityT m a -> a # minimum :: Ord a => IdentityT m a -> a # head :: IdentityT m a -> a # last :: IdentityT m a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> IdentityT m a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> IdentityT m a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> IdentityT m a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> IdentityT m a -> b #
Foldable1 f => Foldable1 (Reverse f)	Fold from right to left.
Instance details Defined in Data.Functor.Reverse Methods fold1 :: Semigroup m => Reverse f m -> m # foldMap1 :: Semigroup m => (a -> m) -> Reverse f a -> m # foldMap1' :: Semigroup m => (a -> m) -> Reverse f a -> m # toNonEmpty :: Reverse f a -> NonEmpty a # maximum :: Ord a => Reverse f a -> a # minimum :: Ord a => Reverse f a -> a # head :: Reverse f a -> a # last :: Reverse f a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Reverse f a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Reverse f a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Reverse f a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Reverse f a -> b #
(Foldable1 f, Foldable1 g) => Foldable1 (Product f g)	It would be enough for either half of a product to be `Foldable1`. Other could be `Foldable`.
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Product f g m -> m # foldMap1 :: Semigroup m => (a -> m) -> Product f g a -> m # foldMap1' :: Semigroup m => (a -> m) -> Product f g a -> m # toNonEmpty :: Product f g a -> NonEmpty a # maximum :: Ord a => Product f g a -> a # minimum :: Ord a => Product f g a -> a # head :: Product f g a -> a # last :: Product f g a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Product f g a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Product f g a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Product f g a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Product f g a -> b #
(Foldable1 f, Foldable1 g) => Foldable1 (Sum f g)	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Sum f g m -> m # foldMap1 :: Semigroup m => (a -> m) -> Sum f g a -> m # foldMap1' :: Semigroup m => (a -> m) -> Sum f g a -> m # toNonEmpty :: Sum f g a -> NonEmpty a # maximum :: Ord a => Sum f g a -> a # minimum :: Ord a => Sum f g a -> a # head :: Sum f g a -> a # last :: Sum f g a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Sum f g a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Sum f g a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Sum f g a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Sum f g a -> b #
(Foldable1 f, Foldable1 g) => Foldable1 (f :*: g)	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => (f :: g) m -> m # foldMap1 :: Semigroup m => (a -> m) -> (f :: g) a -> m # foldMap1' :: Semigroup m => (a -> m) -> (f :: g) a -> m # toNonEmpty :: (f :: g) a -> NonEmpty a # maximum :: Ord a => (f :: g) a -> a # minimum :: Ord a => (f :: g) a -> a # head :: (f :: g) a -> a # last :: (f :: g) a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> (f :: g) a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> (f :: g) a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> (f :: g) a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> (f :: g) a -> b #
(Foldable1 f, Foldable1 g) => Foldable1 (f :+: g)	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => (f :+: g) m -> m # foldMap1 :: Semigroup m => (a -> m) -> (f :+: g) a -> m # foldMap1' :: Semigroup m => (a -> m) -> (f :+: g) a -> m # toNonEmpty :: (f :+: g) a -> NonEmpty a # maximum :: Ord a => (f :+: g) a -> a # minimum :: Ord a => (f :+: g) a -> a # head :: (f :+: g) a -> a # last :: (f :+: g) a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> (f :+: g) a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> (f :+: g) a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> (f :+: g) a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> (f :+: g) a -> b #
(Foldable1 f, Foldable1 g) => Foldable1 (Compose f g)	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => Compose f g m -> m # foldMap1 :: Semigroup m => (a -> m) -> Compose f g a -> m # foldMap1' :: Semigroup m => (a -> m) -> Compose f g a -> m # toNonEmpty :: Compose f g a -> NonEmpty a # maximum :: Ord a => Compose f g a -> a # minimum :: Ord a => Compose f g a -> a # head :: Compose f g a -> a # last :: Compose f g a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> Compose f g a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> Compose f g a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> Compose f g a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> Compose f g a -> b #
(Foldable1 f, Foldable1 g) => Foldable1 (f :.: g)	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => (f :.: g) m -> m # foldMap1 :: Semigroup m => (a -> m) -> (f :.: g) a -> m # foldMap1' :: Semigroup m => (a -> m) -> (f :.: g) a -> m # toNonEmpty :: (f :.: g) a -> NonEmpty a # maximum :: Ord a => (f :.: g) a -> a # minimum :: Ord a => (f :.: g) a -> a # head :: (f :.: g) a -> a # last :: (f :.: g) a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> (f :.: g) a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> (f :.: g) a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> (f :.: g) a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> (f :.: g) a -> b #
Foldable1 f => Foldable1 (M1 i c f)	Since: base-4.18.0.0
Instance details Defined in Data.Foldable1 Methods fold1 :: Semigroup m => M1 i c f m -> m # foldMap1 :: Semigroup m => (a -> m) -> M1 i c f a -> m # foldMap1' :: Semigroup m => (a -> m) -> M1 i c f a -> m # toNonEmpty :: M1 i c f a -> NonEmpty a # maximum :: Ord a => M1 i c f a -> a # minimum :: Ord a => M1 i c f a -> a # head :: M1 i c f a -> a # last :: M1 i c f a -> a # foldrMap1 :: (a -> b) -> (a -> b -> b) -> M1 i c f a -> b # foldlMap1' :: (a -> b) -> (b -> a -> b) -> M1 i c f a -> b # foldlMap1 :: (a -> b) -> (b -> a -> b) -> M1 i c f a -> b # foldrMap1' :: (a -> b) -> (a -> b -> b) -> M1 i c f a -> b #
Foldable1 g => Foldable1 (Joker g a)
Instance details Defined in Data.Bifunctor.Joker Methods fold1 :: Semigroup m => Joker g a m -> m # foldMap1 :: Semigroup m => (a0 -> m) -> Joker g a a0 -> m # foldMap1' :: Semigroup m => (a0 -> m) -> Joker g a a0 -> m # toNonEmpty :: Joker g a a0 -> NonEmpty a0 # maximum :: Ord a0 => Joker g a a0 -> a0 # minimum :: Ord a0 => Joker g a a0 -> a0 # head :: Joker g a a0 -> a0 # last :: Joker g a a0 -> a0 # foldrMap1 :: (a0 -> b) -> (a0 -> b -> b) -> Joker g a a0 -> b # foldlMap1' :: (a0 -> b) -> (b -> a0 -> b) -> Joker g a a0 -> b # foldlMap1 :: (a0 -> b) -> (b -> a0 -> b) -> Joker g a a0 -> b # foldrMap1' :: (a0 -> b) -> (a0 -> b -> b) -> Joker g a a0 -> b #

intercalate1 :: (Foldable1 t, Semigroup m) => m -> t m -> m #

Insert an m between each pair of t m.

>>> intercalate1 ", " $ "hello" :| ["how", "are", "you"]
"hello, how, are, you"

>>> intercalate1 ", " $ "hello" :| []
"hello"

>>> intercalate1 mempty $ "I" :| ["Am", "Fine", "You?"]
"IAmFineYou?"

Since: base-4.18.0.0

foldrM1 :: (Foldable1 t, Monad m) => (a -> a -> m a) -> t a -> m a #

Monadic fold over the elements of a non-empty structure, associating to the right, i.e. from right to left.

Since: base-4.18.0.0

foldlM1 :: (Foldable1 t, Monad m) => (a -> a -> m a) -> t a -> m a #

Monadic fold over the elements of a non-empty structure, associating to the left, i.e. from left to right.

Since: base-4.18.0.0

intercalateMap1 :: (Foldable1 t, Semigroup m) => m -> (a -> m) -> t a -> m Source #

Insert m between each pair of m derived from a.

>>> intercalateMap1 " " show $ True :| [False, True]
"True False True"

>>> intercalateMap1 " " show $ True :| []
"True"

traverse1_ :: (Foldable1 t, Apply f) => (a -> f b) -> t a -> f () Source #

for1_ :: (Foldable1 t, Apply f) => t a -> (a -> f b) -> f () Source #

sequenceA1_ :: (Foldable1 t, Apply f) => t (f a) -> f () Source #

foldMapDefault1 :: (Foldable1 t, Monoid m) => (a -> m) -> t a -> m Source #

Usable default for foldMap, but only if you define foldMap1 yourself

asum1 :: (Foldable1 t, Alt m) => t (m a) -> m a Source #

gfold1 :: (Foldable1 (Rep1 t), Generic1 t, Semigroup m) => t m -> m Source #

Generic fold1. Caveats:

Will not compile if t is an empty constructor.
Will not compile if t has some fields that don't mention a, for exmaple data Bar a = MkBar a Int

Since: 5.3.8

gfoldMap1 :: (Foldable1 (Rep1 t), Generic1 t, Semigroup m) => (a -> m) -> t a -> m Source #

Generic foldMap1. Caveats are the same as for gfold1.

Since: 5.3.8

gtoNonEmpty :: (Foldable1 (Rep1 t), Generic1 t) => t a -> NonEmpty a Source #

Generic toNonEmpty. Caveats are the same as for gfold1.

Since: 5.3.8