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(
<$> ) :: Functor f => (a -> b) -> f a -> f bxmonad-contrib XMonad.Config.Prime An infix synonym for fmap. The name of this operator is an allusion to $. Note the similarities between their types:
($) :: (a -> b) -> a -> b (<$>) :: Functor f => (a -> b) -> f a -> f b
Whereas $ is function application, <$> is function application lifted over a Functor.Examples
Convert from a Maybe Int to a Maybe String using show:>>> show <$> Nothing Nothing
>>> show <$> Just 3 Just "3"
Convert from an Either Int Int to an Either Int String using show:>>> show <$> Left 17 Left 17
>>> show <$> Right 17 Right "17"
Double each element of a list:>>> (*2) <$> [1,2,3] [2,4,6]
Apply even to the second element of a pair:>>> even <$> (2,2) (2,True)
data (a6989586621679541715 :: a ~> b)
<$>@#@$$ (b1 :: TyFun f a f b)singletons-base Control.Applicative.Singletons No documentation available.
type family (a6989586621679541715 :: a ~> b)
<$>@#@$$$ (a6989586621679541716 :: f a) :: f bsingletons-base Control.Applicative.Singletons No documentation available.
data (a6989586621679541715 :: a ~> b)
<$>@#@$$ (b1 :: TyFun f a f b)singletons-base Data.Functor.Singletons No documentation available.
type family (a6989586621679541715 :: a ~> b)
<$>@#@$$$ (a6989586621679541716 :: f a) :: f bsingletons-base Data.Functor.Singletons No documentation available.
data (a6989586621679541715 :: a ~> b)
<$>@#@$$ (b1 :: TyFun f a f b)singletons-base Prelude.Singletons No documentation available.
type family (a6989586621679541715 :: a ~> b)
<$>@#@$$$ (a6989586621679541716 :: f a) :: f bsingletons-base Prelude.Singletons No documentation available.
data (c :: a ~> b)
<$>$ (d :: TyFun m a m b)type-spec Test.TypeSpec.Internal.Apply No documentation available.
(
<$>> ) :: HasTrie (Basis a) => (b -> c) -> (a :> b) -> a :> cvector-space Data.Maclaurin Map a linear function over a derivative tower.
(
<$>^ ) :: (a -> b) -> f a -> Aps f bap-normalize ApNormalize f <$>^ u :: Aps f b is a delayed representation of f <$> u :: f b, so that it can be fused with other applicative operations. f <$>^ u is a shorthand for f <$> liftAps u.