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1. foldToMaybeWithIndexTree :: (b -> b -> b) -> (Int -> Elem y -> b) -> Int -> FingerTree (Elem y) -> Maybe b

   containers	Data.Sequence.Internal.Sorting

   A foldMapWithIndex-like function, specialized to the Option monoid, which takes advantage of the internal structure of Seq to avoid wrapping in Maybe at certain points.

2. exceptToMaybeT :: forall (m :: Type -> Type) e a . Functor m => ExceptT e m a -> MaybeT m a

   transformers	Control.Monad.Trans.Maybe

   Convert a ExceptT computation to MaybeT, discarding the value of any exception.

3. hoistMaybe :: forall (m :: Type -> Type) b . Applicative m => Maybe b -> MaybeT m b

   transformers	Control.Monad.Trans.Maybe

   Convert a Maybe computation to MaybeT.

4. mapMaybeT :: (m (Maybe a) -> n (Maybe b)) -> MaybeT m a -> MaybeT n b

   transformers	Control.Monad.Trans.Maybe

   Transform the computation inside a MaybeT.

   • runMaybeT (mapMaybeT f m) = f (runMaybeT
     m)

5. runMaybeT :: MaybeT (m :: Type -> Type) a -> m (Maybe a)

   transformers	Control.Monad.Trans.Maybe

   No documentation available.

6. suchThatMaybe :: Gen a -> (a -> Bool) -> Gen (Maybe a)

   QuickCheck	Test.QuickCheck

   Tries to generate a value that satisfies a predicate. If it fails to do so after enough attempts, returns Nothing.

7. suchThatMaybe :: Gen a -> (a -> Bool) -> Gen (Maybe a)

   QuickCheck	Test.QuickCheck.Gen

   Tries to generate a value that satisfies a predicate. If it fails to do so after enough attempts, returns Nothing.

8. mapMaybe :: (a -> Maybe b) -> KeyMap a -> KeyMap b

   aeson	Data.Aeson.KeyMap

   Map values and collect the Just results.

9. mapMaybeWithKey :: (Key -> v -> Maybe u) -> KeyMap v -> KeyMap u

   aeson	Data.Aeson.KeyMap

   Map values and collect the Just results.

10. explicitParseFieldMaybe :: (Value -> Parser a) -> Object -> Key -> Parser (Maybe a)

    aeson	Data.Aeson.Types

    Variant of .:? with explicit parser function.

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