RxDart adds additional capabilities to Dart Streams and StreamControllers.
Dart comes with a very decent Streams API out-of-the-box; rather than attempting to provide an alternative to this API, RxDart adds functionality from the reactive extensions specification on top of it.
#RxDart does not provide its own Observable class as a replacement for #Dart Streams. Rather, it provides a number of additional Stream classes, operators (extension methods on the Stream class), and Subjects.
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