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mapM :: Monad m => (a -> m b) -> Stream m a -> Stream m bstreamly-core Streamly.Internal.Data.Stream >>> mapM f = Stream.sequence . fmap f
Apply a monadic function to each element of the stream and replace it with the output of the resulting action.>>> s = Stream.fromList ["a", "b", "c"] >>> Stream.fold Fold.drain $ Stream.mapM putStr s abc
mapM_ :: Monad m => (a -> m b) -> Stream m a -> m ()streamly-core Streamly.Internal.Data.Stream Execute a monadic action for each element of the Stream
mapMaybe :: forall (m :: Type -> Type) a b . Monad m => (a -> Maybe b) -> Stream m a -> Stream m bstreamly-core Streamly.Internal.Data.Stream Map a Maybe returning function to a stream, filter out the Nothing elements, and return a stream of values extracted from Just. Equivalent to:
>>> mapMaybe f = Stream.catMaybes . fmap f
mapMaybeM :: Monad m => (a -> m (Maybe b)) -> Stream m a -> Stream m bstreamly-core Streamly.Internal.Data.Stream Like mapMaybe but maps a monadic function. Equivalent to:
>>> mapMaybeM f = Stream.catMaybes . Stream.mapM f
>>> mapM f = Stream.mapMaybeM (\x -> Just <$> f x)
mapM :: Monad m => (a -> m b) -> StreamK m a -> StreamK m bstreamly-core Streamly.Internal.Data.StreamK No documentation available.
mapMSerial :: Monad m => (a -> m b) -> StreamK m a -> StreamK m bstreamly-core Streamly.Internal.Data.StreamK No documentation available.
mapMWith :: (m b -> StreamK m b -> StreamK m b) -> (a -> m b) -> StreamK m a -> StreamK m bstreamly-core Streamly.Internal.Data.StreamK No documentation available.
mapM_ :: Monad m => (a -> m b) -> StreamK m a -> m ()streamly-core Streamly.Internal.Data.StreamK Apply a monadic action to each element of the stream and discard the output of the action.
mapMaybe :: forall a b (m :: Type -> Type) . (a -> Maybe b) -> StreamK m a -> StreamK m bstreamly-core Streamly.Internal.Data.StreamK No documentation available.
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streamly-core Streamly.Internal.Data.Unfold >>> map2 f = Unfold.mapM2 (\a b -> pure (f a b))
Note that the seed may mutate (e.g. if the seed is a Handle or IORef) as stream is generated from it, so we need to be careful when reusing the seed while the stream is being generated from it.