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Within LTS Haskell 24.39 (ghc-9.10.3)

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  1. showNumMaybe :: (SqlContext c, Num a, IsString b) => Record c (Maybe a) -> Record c (Maybe b)

    relational-schemas Database.Custom.SQLite3

    Unsafely show number into string-like type in records.

  2. sumMaybe :: (Num a, AggregatedContext ac, SqlContext ac) => Record Flat (Maybe a) -> Record ac (Maybe a)

    relational-schemas Database.Custom.SQLite3

    Aggregation function SUM.

  3. uniqueQueryMaybe' :: UniqueRelation p c r -> QueryUnique (PlaceHolders p, Record c (Maybe r))

    relational-schemas Database.Custom.SQLite3

    Join unique sub-query with place-holder parameter p. Query result is Maybe.

  4. catMaybes :: [Maybe a] -> [a]

    strict-base-types Data.Maybe.Strict

    Analogous to catMaybes in Data.Maybe.

  5. fromMaybe :: a -> Maybe a -> a

    strict-base-types Data.Maybe.Strict

    Given a default value and a Maybe, yield the default value if the Maybe argument is Nothing and extract the value out of the Just otherwise.

  6. listToMaybe :: [a] -> Maybe a

    strict-base-types Data.Maybe.Strict

    Analogous to listToMaybe in Data.Maybe.

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

    strict-base-types Data.Maybe.Strict

    Analogous to mapMaybe in Data.Maybe.

  8. hoistMaybe :: forall (m :: Type -> Type) x a . Monad m => x -> Maybe a -> EitherT x m a

    transformers-either Control.Monad.Trans.Either

    Hoist Maybe a into Right a.

  9. liftMaybeK :: forall (m :: Type -> Type) a . Applicative m => MaybeK a -> MaybeKT m a

    unification-fd Control.Monad.MaybeK

    Lift an MaybeK into an MaybeKT.

  10. lowerMaybeK :: Applicative m => MaybeKT m a -> m (MaybeK a)

    unification-fd Control.Monad.MaybeK

    Lower an MaybeKT into an MaybeK.

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