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Within LTS Haskell 24.51 (ghc-9.10.3)

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1. readMaybe :: (PrimMonad m, Storable a) => MVector (PrimState m) a -> Int -> m (Maybe a)

   rebase	Rebase.Data.Vector.Storable.Mutable

   No documentation available.

2. imapMaybe :: (Unbox a, Unbox b) => (Int -> a -> Maybe b) -> Vector a -> Vector b

   rebase	Rebase.Data.Vector.Unboxed

   No documentation available.

3. imapMaybeM :: (Monad m, Unbox a, Unbox b) => (Int -> a -> m (Maybe b)) -> Vector a -> m (Vector b)

   rebase	Rebase.Data.Vector.Unboxed

   No documentation available.

4. mapMaybe :: (Unbox a, Unbox b) => (a -> Maybe b) -> Vector a -> Vector b

   rebase	Rebase.Data.Vector.Unboxed

   No documentation available.

5. mapMaybeM :: (Monad m, Unbox a, Unbox b) => (a -> m (Maybe b)) -> Vector a -> m (Vector b)

   rebase	Rebase.Data.Vector.Unboxed

   No documentation available.

6. readMaybe :: (PrimMonad m, Unbox a) => MVector (PrimState m) a -> Int -> m (Maybe a)

   rebase	Rebase.Data.Vector.Unboxed.Mutable

   No documentation available.

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

   rebase	Rebase.Prelude

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

8. fromMaybeS :: Selective f => f a -> f (Maybe a) -> f a

   rebase	Rebase.Prelude

   A lifted version of fromMaybe.

9. leftToMaybe :: Either a b -> Maybe a

   rebase	Rebase.Prelude

   Maybe get the Left side of an Either.

   leftToMaybe ≡ either Just (const Nothing)
   

   Using Control.Lens:

   leftToMaybe ≡ preview _Left
   leftToMaybe x ≡ x^?_Left
   

   >>> leftToMaybe (Left 12)
   Just 12
   

   >>> leftToMaybe (Right 12)
   Nothing
   

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

    rebase	Rebase.Prelude

    Transform the computation inside a MaybeT.

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

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