mapMaybe package:conduit

mapMaybe :: Monad m => (a -> Maybe b) -> ConduitT a b m ()
conduit Data.Conduit.List
Apply a transformation that may fail to all values in a stream, discarding the failures. Subject to fusion Since 0.5.1
mapMaybeMS :: Monad m => (a -> m (Maybe b)) -> StreamConduit a m b
conduit Data.Conduit.Internal.List.Stream
mapMaybeS :: Monad m => (a -> Maybe b) -> StreamConduit a m b
conduit Data.Conduit.Internal.List.Stream
mapMaybeM :: Monad m => (a -> m (Maybe b)) -> ConduitT a b m ()
conduit Data.Conduit.List
Apply a monadic transformation that may fail to all values in a stream, discarding the failures. Subject to fusion Since 0.5.1