Streams and sinks are backbones in Dart and Flutter asynchronous programming . … A Stream gives an approach to get a sequence of events. Every event is either an information event, a component of the stream, or an error event, a warning that something has fizzled.
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A controller with the stream it controls . This controller allows sending data, error and done events on its stream. This class can be used to create a simple stream that others can listen on, and to push events to that stream.
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