What is the difference between Subject and BehaviorSubject?

Question

I\'m not clear on the difference between a Subject and a BehaviorSubject. Is it just that a BehaviorSubject has the getValue()

Answer 1

BehaviorSubject keeps in memory the last value that was emitted by the observable. A regular Subject doesn't.

BehaviorSubject is like ReplaySubject with a buffer size of 1.