Hoogle Search
Within LTS Haskell 24.4 (ghc-9.10.2)
Note that Stackage only displays results for the latest LTS and Nightly snapshot. Learn more.
(
<$> ) :: Functor f => (a -> b) -> f a -> f bclash-prelude Clash.HaskellPrelude 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)
(
:$$: ) :: ErrorMessage -> ErrorMessage -> ErrorMessageclash-prelude Clash.Prelude Stack two pieces of error message on top of each other.
(
:$$: ) :: ErrorMessage -> ErrorMessage -> ErrorMessageclash-prelude Clash.Prelude.Safe Stack two pieces of error message on top of each other.
-
code-conjure Conjure.Engine > absE -$- one abs $ 1 :: Int
Works for Int, Bool, Char argument types and their lists. -
code-conjure Conjure.Engine function application between expressions
(
>$$ ) :: [Expr] -> Expr -> [Expr]code-conjure Conjure.Engine Lists valid applications between a list of Exprs and an Expr.
> [plus, times] >$$ zero [(0 +) :: Int -> Int,(0 *) :: Int -> Int]
(
>$$< ) :: [Expr] -> [Expr] -> [Expr]code-conjure Conjure.Engine Lists valid applications between lists of Exprs
> [notE, plus] >$$< [false, true, zero] [not False :: Bool,not True :: Bool,(0 +) :: Int -> Int]
-
code-conjure Conjure.Expr > absE -$- one abs $ 1 :: Int
Works for Int, Bool, Char argument types and their lists. -
code-conjure Conjure.Expr function application between expressions
(
>$$ ) :: [Expr] -> Expr -> [Expr]code-conjure Conjure.Expr Lists valid applications between a list of Exprs and an Expr.
> [plus, times] >$$ zero [(0 +) :: Int -> Int,(0 *) :: Int -> Int]