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  1. traverseMaybe :: Applicative f => forall a . () => (a -> f (Maybe b)) -> OrderedMap a -> f (OrderedMap b)

    graphql Language.GraphQL.Execute.OrderedMap

    Traverse over the elements and collect the Just results.

  2. arbitraryMaybe :: Gen a -> Gen (Maybe a)

    haskoin-core Haskoin.Util.Arbitrary.Util

    Generate a Maybe from a Gen a

  3. eitherToMaybe :: Either a b -> Maybe b

    haskoin-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.

  4. getMaybe :: MonadGet m => m a -> m (Maybe a)

    haskoin-core Haskoin.Util.Helpers

    No documentation available.

  5. liftMaybe :: forall (m :: Type -> Type) b a . Monad m => b -> Maybe a -> ExceptT b m a

    haskoin-core Haskoin.Util.Helpers

    Lift a Maybe computation into the ExceptT monad.

  6. putMaybe :: MonadPut m => (a -> m ()) -> Maybe a -> m ()

    haskoin-core Haskoin.Util.Helpers

    No documentation available.

  7. untilMaybe :: Monad m => (a -> Maybe b) -> m a -> m b

    hosc Sound.Osc.Wait

    Repeat action until f does not give Nothing when applied to result.

  8. sqlAddValidCheckMaybeDowntime :: Check -> RawSQL ()

    hpqtypes-extras Database.PostgreSQL.PQTypes.Model.Check

    Add valid check constraint. Warning: PostgreSQL acquires SHARE ROW EXCLUSIVE lock (that prevents updates) on modified table for the duration of the creation. If this is not acceptable, use sqlAddNotValidCheck and sqlValidateCheck.

  9. sqlAddValidFKMaybeDowntime :: RawSQL () -> ForeignKey -> RawSQL ()

    hpqtypes-extras Database.PostgreSQL.PQTypes.Model.ForeignKey

    Add valid foreign key. Warning: PostgreSQL acquires SHARE ROW EXCLUSIVE lock (that prevents data updates) on both modified and referenced table for the duration of the creation. If this is not acceptable, use sqlAddNotValidFK and sqlValidateFK.

  10. sqlCreateIndexMaybeDowntime :: RawSQL () -> TableIndex -> RawSQL ()

    hpqtypes-extras Database.PostgreSQL.PQTypes.Model.Index

    Create an index. Warning: if the affected table is large, this will prevent the table from being modified during the creation. If this is not acceptable, use CreateIndexConcurrentlyMigration. See https://www.postgresql.org/docs/current/sql-createindex.html for more information.

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