What is BehaviorSubject, how does it differ from Subject, and in what cases is it better to use?

Question

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What is BehaviorSubject, how does it differ from Subject, and in what cases is it better to use?

Answer 1

https://stackoverflow.com/questions/43348463/what-...
Roughly speaking, BehaviorSubject stores the last sent value, and if you subscribe to it after sending the value, you will immediately get the last sent value, and besides , you can immediately create it with a preset value.