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RxSwift/Documentation/Subjects.md
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Subjects

All of behave exactly the same like described here

Relays

RxCocoa provides two kinds of Relays: PublishRelay and BehaviorRelay. They behave exactly like their parallel Subjects, with two changes:

  • Relays never complete.
  • Relays never emit errors.

In essence, Relays only emit .next events, and never terminate.