Hoogle Search
Within LTS Haskell 24.28 (ghc-9.10.3)
Note that Stackage only displays results for the latest LTS and Nightly snapshot. Learn more.
(
<$> ) :: Functor f => (a -> b) -> f a -> f bhledger-web Hledger.Web.Import 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 <$> (2,2) (2,True)
(
<$> ) :: Functor f => (a <-> b) -> f a -> f binvertible Control.Invertible.Functor An infix synnonym for fmap.
(
<$> ) :: IsoFunctor f => (a <-> b) -> f a -> f binvertible Data.Invertible.PartialIsomorphism Apply a bijection over a IsoFunctor using <$>.
(
<$> ) :: Functor f => (a <-> b) -> f a -> f binvertible Data.Invertible.Prelude An infix synnonym for fmap.
(
<$> ) :: Functor f => (a -> b) -> f a -> f bopt-env-conf OptEnvConf 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 <$> (2,2) (2,True)
(
<$> ) :: IsoFunctor f => Iso alpha beta -> f alpha -> f betapartial-isomorphisms Control.Isomorphism.Partial.Prim No documentation available.
-
prettyprinter-compat-ansi-wl-pprint Text.PrettyPrint.ANSI.Leijen No documentation available.
(
<$> ) :: Functor f => (a -> b) -> f a -> f bthreepenny-gui Graphics.UI.Threepenny.Core 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 <$> (2,2) (2,True)
(
<$> ) :: Functor f => (a -> b) -> f a -> f bclassy-prelude-yesod ClassyPrelude.Yesod 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 <$> (2,2) (2,True)
(
<$> ) :: (Functor f r (->), Object r a, Object r b) => r a b -> f a -> f bconstrained-categories Control.Category.Constrained.Prelude No documentation available.