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  1. untilMaybe :: forall (m :: Type -> Type) a b . Monad m => MSF m a b -> MSF m b Bool -> MSF (MaybeT m) a b

    dunai Control.Monad.Trans.MSF.Maybe

    Run the first msf until the second one produces True from the output of the first.

  2. mapMaybeS :: forall (m :: Type -> Type) a b . Monad m => MSF m a b -> MSF m (Maybe a) (Maybe b)

    dunai Data.MonadicStreamFunction.Util

    Apply an MSF to every input. Freezes temporarily if the input is Nothing, and continues as soon as a Just is received.

  3. elimMaybe :: forall a (p :: Maybe a ~> Type) (s :: Maybe a) . Sing s -> Apply p ('Nothing :: Maybe a) -> (forall (f0 :: a) . () => Sing f0 -> Apply p ('Just f0)) -> Apply p s

    eliminators Data.Eliminator

    No documentation available.

  4. EMaybe :: ElmDatatype -> ElmPrimitive

    elm-export Elm

    No documentation available.

  5. eitherMaybe :: Either () a -> Maybe a

    errors-ext Control.Error.Extensions

    Converts Either to Maybe. Specialization of either. 

    maybeEither . eitherMaybe = id

  6. productMaybeWith :: (a -> b -> Maybe c) -> [[a]] -> [[b]] -> [[c]]

    extrapolate Test.Extrapolate

    Take the product of lists of tiers by a function returning a Maybe value discarding Nothing values.

  7. productMaybeWith :: (a -> b -> Maybe c) -> [[a]] -> [[b]] -> [[c]]

    extrapolate Test.Extrapolate.Core

    Take the product of lists of tiers by a function returning a Maybe value discarding Nothing values.

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

    fmlist Data.FMList

    No documentation available.

  9. eitherToMaybe :: Either e a -> Maybe a

    from-sum Control.FromSum

    Convert an Either to a Maybe. A Right value becomes Just. 

    >>> eitherToMaybe $ Right 3
Just 3
    A Left value becomes Nothing. 
    >>> eitherToMaybe $ Left "bye"
Nothing

  10. fromMaybe :: a -> Maybe a -> a

    from-sum Control.FromSum

    The fromMaybe function takes a default value and a Maybe value. If the Maybe is Nothing, it returns the default value; otherwise, it returns the value contained in the Maybe.

    Examples

    Basic usage: 
    >>> fromMaybe "" (Just "Hello, World!")
"Hello, World!"

    >>> fromMaybe "" Nothing
""
    Read an integer from a string using readMaybe. If we fail to parse an integer, we want to return 0 by default: 
    >>> import GHC.Internal.Text.Read ( readMaybe )

>>> fromMaybe 0 (readMaybe "5")
5

>>> fromMaybe 0 (readMaybe "")
0

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