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runMaybeF :: MaybeF (f :: k -> Type) (a :: k) -> Maybe (f a)functor-combinators Control.Applicative.ListF No documentation available.
runMaybeF :: MaybeF (f :: k -> Type) (a :: k) -> Maybe (f a)functor-combinators Data.Functor.Combinator No documentation available.
data
PMaybe (a :: k -> Type) (b :: Maybe k)functor-products Data.Type.Functor.Product A PMaybe f 'Nothing contains nothing, and a PMaybe f ('Just a) contains an f a. In practice this can be useful to write polymorphic functions/abstractions that contain an argument that can be "turned off" for different instances.
type
XMaybe (f :: k -> Type) = PMaybe XData ffunctor-products Data.Type.Functor.XProduct -
ginger Text.Ginger.Run.Type No documentation available.
-
graphql Language.GraphQL.Execute.OrderedMap Traverse over the elements and collect the Just results.
arbitraryMaybe :: Gen a -> Gen (Maybe a)haskoin-core Haskoin.Util.Arbitrary.Util Generate a Maybe from a Gen a
eitherToMaybe :: Either a b -> Maybe bhaskoin-core Haskoin.Util.Helpers Transform an Either value into a Maybe value. Right is mapped to Just and Left is mapped to Nothing. The value inside Left is lost.
getMaybe :: MonadGet m => m a -> m (Maybe a)haskoin-core Haskoin.Util.Helpers No documentation available.
liftMaybe :: forall (m :: Type -> Type) b a . Monad m => b -> Maybe a -> ExceptT b m ahaskoin-core Haskoin.Util.Helpers