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1. mapMaybeDTyConEnv :: (a -> Maybe b) -> DTyConEnv a -> DTyConEnv b

   ghc	GHC.Core.TyCon.Env

   No documentation available.

2. mapMaybeBag :: (a -> Maybe b) -> Bag a -> Bag b

   ghc	GHC.Data.Bag

   No documentation available.

3. mapMaybeBagM :: Monad m => (a -> m (Maybe b)) -> Bag a -> m (Bag b)

   ghc	GHC.Data.Bag

   No documentation available.

4. mapMaybeFsEnv :: (elt1 -> Maybe elt2) -> FastStringEnv elt1 -> FastStringEnv elt2

   ghc	GHC.Data.FastString.Env

   No documentation available.

5. mapMaybeMissing :: forall (f :: Type -> Type) x y . Applicative f => (Key -> x -> Maybe y) -> WhenMissing f x y

   ghc	GHC.Data.Word64Map.Internal

   Map over the entries whose keys are missing from the other map, optionally removing some. This is the most powerful SimpleWhenMissing tactic, but others are usually more efficient.

   mapMaybeMissing :: (Key -> x -> Maybe y) -> SimpleWhenMissing x y
   

   mapMaybeMissing f = traverseMaybeMissing (\k x -> pure (f k x))
   

   but mapMaybeMissing uses fewer unnecessary Applicative operations.

6. mapMaybeWithKey :: (Key -> a -> Maybe b) -> Word64Map a -> Word64Map b

   ghc	GHC.Data.Word64Map.Internal

   Map keys/values and collect the Just results.

   let f k _ = if k < 5 then Just ("key : " ++ (show k)) else Nothing
   mapMaybeWithKey f (fromList [(5,"a"), (3,"b")]) == singleton 3 "key : 3"
   

7. mapMaybeWithKey :: (Key -> a -> Maybe b) -> Word64Map a -> Word64Map b

   ghc	GHC.Data.Word64Map.Lazy

   Map keys/values and collect the Just results.

   let f k _ = if k < 5 then Just ("key : " ++ (show k)) else Nothing
   mapMaybeWithKey f (fromList [(5,"a"), (3,"b")]) == singleton 3 "key : 3"
   

8. mapMaybeWithKey :: (Key -> a -> Maybe b) -> Word64Map a -> Word64Map b

   ghc	GHC.Data.Word64Map.Strict

   Map keys/values and collect the Just results.

   let f k _ = if k < 5 then Just ("key : " ++ (show k)) else Nothing
   mapMaybeWithKey f (fromList [(5,"a"), (3,"b")]) == singleton 3 "key : 3"
   

9. mapMaybeWithKey :: (Key -> a -> Maybe b) -> Word64Map a -> Word64Map b

   ghc	GHC.Data.Word64Map.Strict.Internal

   Map keys/values and collect the Just results.

   let f k _ = if k < 5 then Just ("key : " ++ (show k)) else Nothing
   mapMaybeWithKey f (fromList [(5,"a"), (3,"b")]) == singleton 3 "key : 3"
   

10. mapMaybeOccEnv :: (a -> Maybe b) -> OccEnv a -> OccEnv b

    ghc	GHC.Plugins

    mapMaybe for b OccEnv.

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