Module
Data.FunctorWithIndex
- Package
- purescript-foldable-traversable
- Repository
- purescript/purescript-foldable-traversable
#FunctorWithIndex Source
class (Functor f) <= FunctorWithIndex i f | f -> i where
A Functor
with an additional index.
Instances must satisfy a modified form of the Functor
laws
mapWithIndex (\_ a -> a) = identity
mapWithIndex f . mapWithIndex g = mapWithIndex (\i -> f i <<< g i)
and be compatible with the Functor
instance
map f = mapWithIndex (const f)
Members
mapWithIndex :: forall a b. (i -> a -> b) -> f a -> f b
Instances
FunctorWithIndex Int Array
FunctorWithIndex Unit Maybe
FunctorWithIndex Unit First
FunctorWithIndex Unit Last
FunctorWithIndex Unit Additive
FunctorWithIndex Unit Dual
FunctorWithIndex Unit Conj
FunctorWithIndex Unit Disj
FunctorWithIndex Unit Multiplicative
FunctorWithIndex Unit (Either a)
FunctorWithIndex Unit (Tuple a)
FunctorWithIndex Unit Identity
FunctorWithIndex Void (Const a)
(FunctorWithIndex a f, FunctorWithIndex b g) => FunctorWithIndex (Either a b) (Product f g)
(FunctorWithIndex a f, FunctorWithIndex b g) => FunctorWithIndex (Either a b) (Coproduct f g)
(FunctorWithIndex a f, FunctorWithIndex b g) => FunctorWithIndex (Tuple a b) (Compose f g)
(FunctorWithIndex a f) => FunctorWithIndex a (App f)
#mapDefault Source
mapDefault :: forall i f a b. FunctorWithIndex i f => (a -> b) -> f a -> f b
A default implementation of Functor's map
in terms of mapWithIndex