Hoogle Search

Within LTS Haskell 24.41 (ghc-9.10.3)

Note that Stackage only displays results for the latest LTS and Nightly snapshot. Learn more.

Exact lookup

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

   grisette	Grisette.Unified.Lib.Control.Applicative

   <$ with MergingStrategy knowledge propagation.

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

   grisette	Grisette.Unified.Lib.Control.Applicative

   <$> with MergingStrategy knowledge propagation.

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

   grisette	Grisette.Unified.Lib.Control.Monad

   <$ with MergingStrategy knowledge propagation.

4. (.<$!>) :: (MonadTryMerge m, Mergeable a, Mergeable b) => (a -> b) -> m a -> m b

   grisette	Grisette.Unified.Lib.Control.Monad

   <$!> with MergingStrategy knowledge propagation. Merging is always strict so we can directly use .<$>.

5. (.$>) :: (TryMerge f, Mergeable a, Mergeable b, Functor f) => f a -> b -> f b

   grisette	Grisette.Unified.Lib.Data.Functor

   $> with MergingStrategy knowledge propagation.

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

   grisette	Grisette.Unified.Lib.Data.Functor

   <$ with MergingStrategy knowledge propagation.

7. (.<$>) :: (TryMerge f, Mergeable a, Mergeable b, Functor f) => (a -> b) -> f a -> f b

   grisette	Grisette.Unified.Lib.Data.Functor

   <$> with MergingStrategy knowledge propagation.

8. (<<-$) :: h a b -> (h a b -> h a' b) -> h a' b

   histogram-fill	Data.Histogram.Fill

   Apply function which modify builder

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

   hledger-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)
   

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

    invertible	Control.Invertible.Functor

    An infix synnonym for fmap.

Page 74 of many | Previous | Next