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Within LTS Haskell 24.6 (ghc-9.10.2)
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type (k1 :: t1)
:$$$: (k2 :: t2) = ToEM k1 ':$$: ToEM k2clash-prelude Clash.Class.HasDomain.Common No documentation available.
(
:$$: ) :: ErrorMessage -> ErrorMessage -> ErrorMessageclash-prelude Clash.Explicit.Prelude Stack two pieces of error message on top of each other.
(
:$$: ) :: ErrorMessage -> ErrorMessage -> ErrorMessageclash-prelude Clash.Explicit.Prelude.Safe Stack two pieces of error message on top of each other.
(
<$ ) :: Functor f => a -> f b -> f aclash-prelude Clash.HaskellPrelude 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
(
<$> ) :: 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]