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Within LTS Haskell 24.4 (ghc-9.10.2)
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<$$> ) :: Applicative m => m Doc -> m Doc -> m Docgraphviz Data.GraphViz.Printing The document (x <$$> y) concatenates document x and y with a linebreak in between. (infixr 5)
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<*>.-$ ) :: C x => T v (x -> a) -> (v -> x) -> T v anumeric-prelude Algebra.Additive No documentation available.
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<$ ) :: Functor f => a -> f b -> f anumeric-prelude NumericPrelude Replace all locations in the input with the same value. The default definition is fmap . const, but this may be overridden with a more efficient version.
Examples
Perform a computation with Maybe and replace the result with a constant value if it is Just:>>> 'a' <$ Just 2 Just 'a' >>> 'a' <$ Nothing Nothing
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<$ ) :: Functor f => a -> f b -> f anumeric-prelude NumericPrelude.Base Replace all locations in the input with the same value. The default definition is fmap . const, but this may be overridden with a more efficient version.
Examples
Perform a computation with Maybe and replace the result with a constant value if it is Just:>>> 'a' <$ Just 2 Just 'a' >>> 'a' <$ Nothing Nothing
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<$ ) :: Functor f => a -> f b -> f anumhask NumHask.Prelude Replace all locations in the input with the same value. The default definition is fmap . const, but this may be overridden with a more efficient version.
Examples
Perform a computation with Maybe and replace the result with a constant value if it is Just:>>> 'a' <$ Just 2 Just 'a' >>> 'a' <$ Nothing Nothing
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<$> ) :: Functor f => (a -> b) -> f a -> f bnumhask NumHask.Prelude 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 <$> (2,2) (2,True)
type family (f :: a ~> b)
<$> (ma :: m a) :: m btype-spec Test.TypeSpec.Internal.Apply No documentation available.
data (c :: a ~> b)
<$>$ (d :: TyFun m a m b)type-spec Test.TypeSpec.Internal.Apply No documentation available.
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<$>> ) :: HasTrie (Basis a) => (b -> c) -> (a :> b) -> a :> cvector-space Data.Maclaurin Map a linear function over a derivative tower.
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<$ ) :: Functor f => a -> f b -> f abasic-prelude BasicPrelude Replace all locations in the input with the same value. The default definition is fmap . const, but this may be overridden with a more efficient version.
Examples
Perform a computation with Maybe and replace the result with a constant value if it is Just:>>> 'a' <$ Just 2 Just 'a' >>> 'a' <$ Nothing Nothing