What is the stream in Flutter?

StreamsSelector is a Flutter widget which select streams from a provider and invokes the builder in response to signal emits in the selector stream. StreamsListener is a Flutter widget which takes a StreamsWidgetListener and a selector and invokes the listener in response to signal emits in the selector.

There are two types of streams in Flutter: single subscription streams and broadcast streams . Single subscription streams are the default. They work well when you’re only using a particular stream on one screen. A single subscription stream can only be listened to once.

initialData. The data that will be used to create the initial snapshot . Providing this value (presumably obtained synchronously somehow when the Stream was created) ensures that the first frame will show useful data.