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. mapMaybe :: (a -> Maybe b) -> Patricia a -> Patricia b

   radix-tree	Data.Patricia.Word.Lazy

   Apply a function to every value in the tree and create one out of Just values.

2. mapMaybe :: (a -> Maybe b) -> Patricia a -> Patricia b

   radix-tree	Data.Patricia.Word.Strict

   Apply a function to every value in the tree and create one out of Just values. The Maybe is evaluated to WHNF.

3. mapMaybe :: (a -> Maybe b) -> Radix1Tree a -> Radix1Tree b

   radix-tree	Data.Radix1Tree.Word8.Lazy

   Apply a function to every value in the tree and create one out of Just values.

4. mapMaybe :: (a -> Maybe b) -> Radix1Tree a -> Radix1Tree b

   radix-tree	Data.Radix1Tree.Word8.Strict

   Apply a function to every value in the tree and create one out of Just values. The Maybe is evaluated to WHNF.

5. mapMaybe :: (a -> Maybe b) -> RadixTree a -> RadixTree b

   radix-tree	Data.RadixTree.Word8.Lazy

   Apply a function to every value in the tree and create one out of Just values.

6. mapMaybe :: (a -> Maybe b) -> RadixTree a -> RadixTree b

   radix-tree	Data.RadixTree.Word8.Strict

   Apply a function to every value in the tree and create one out of Just values. The Maybe is evaluated to WHNF.

7. mapMaybe :: forall b a . (a -> Maybe b) -> Slist a -> Slist b

   slist	Slist

   The Maybe version of map which can throw out elements. If appliying the given function returns Nothing, no element is added on to the result list. If it is Just b, then b is included in the result list.

   >>> maybeEven x = if even x then Just x else Nothing
   
   >>> s = cons 1 $ cons 2 $ one 3
   

   >>> mapMaybe maybeEven s
   Slist {sList = [2], sSize = Size 1}
   

   If we map the Just constructor, the entire list should be returned:

   >>> mapMaybe Just s
   Slist {sList = [1,2,3], sSize = Size 3}
   

8. mapMaybe :: forall b a . (a -> Maybe b) -> Slist a -> Slist b

   slist	Slist.Maybe

   The Maybe version of map which can throw out elements. If appliying the given function returns Nothing, no element is added on to the result list. If it is Just b, then b is included in the result list.

   >>> maybeEven x = if even x then Just x else Nothing
   
   >>> s = cons 1 $ cons 2 $ one 3
   

   >>> mapMaybe maybeEven s
   Slist {sList = [2], sSize = Size 1}
   

   If we map the Just constructor, the entire list should be returned:

   >>> mapMaybe Just s
   Slist {sList = [1,2,3], sSize = Size 3}
   

9. mapMaybe :: forall t (m :: Type -> Type) a b . (IsStream t, Monad m) => (a -> Maybe b) -> t m a -> t m b

   streamly	Streamly.Internal.Data.Stream.IsStream

   Map a Maybe returning function to a stream, filter out the Nothing elements, and return a stream of values extracted from Just. Equivalent to:

   mapMaybe f = Stream.map fromJust . Stream.filter isJust . Stream.map f
   

10. mapMaybe :: forall t (m :: Type -> Type) a b . (IsStream t, Monad m) => (a -> Maybe b) -> t m a -> t m b

    streamly	Streamly.Prelude

    Map a Maybe returning function to a stream, filter out the Nothing elements, and return a stream of values extracted from Just. Equivalent to:

    mapMaybe f = Stream.map fromJust . Stream.filter isJust . Stream.map f
    

Page 11 of many | Previous | Next