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.

Exact lookup

1. (<$>) :: Functor f => (a -> b) -> f a -> f b

   appar	Text.Appar.LazyByteString

   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)
   

2. (<$) :: Functor f => a -> f b -> f a

   appar	Text.Appar.String

   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
   

3. (<$>) :: Functor f => (a -> b) -> f a -> f b

   appar	Text.Appar.String

   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)
   

4. (->$) :: IsPgJSON json => QGenExpr ctxt Postgres s (json a) -> QGenExpr ctxt Postgres s Text -> QGenExpr ctxt Postgres s (json b)

   beam-postgres	Database.Beam.Postgres

   Acces a JSON object by key. Corresponds to the Postgres -> operator. See (->#) for the corresponding operator for arrays.

5. (->>$) :: IsPgJSON json => QGenExpr ctxt Postgres s (json a) -> QGenExpr ctxt Postgres s Text -> QGenExpr ctxt Postgres s Text

   beam-postgres	Database.Beam.Postgres

   Access a JSON object by key, returning the embedded object as a string. Corresponds to the Postgres ->> operator. See (->>#) for the corresponding operator on arrays.

6. (<$>) :: Functor f => (a -> b) -> f a -> f b

   breakpoint	Debug.Breakpoint.GhcFacade

   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)
   

7. type (k1 :: t1) :$$$: (k2 :: t2) = ToEM k1 ':$$: ToEM k2

   clash-prelude	Clash.Class.HasDomain.Common

   No documentation available.

8. (:$$:) :: ErrorMessage -> ErrorMessage -> ErrorMessage

   clash-prelude	Clash.Explicit.Prelude

   Stack two pieces of error message on top of each other.

9. (:$$:) :: ErrorMessage -> ErrorMessage -> ErrorMessage

   clash-prelude	Clash.Explicit.Prelude.Safe

   Stack two pieces of error message on top of each other.

10. (<$) :: Functor f => a -> f b -> f a

    clash-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
    

Page 69 of many | Previous | Next