ReplaySubject is a type of Observable provided by the RxJS library in TypeScript. It extends the Subject class and allows for the broadcasting of previously emitted values to new subscribers.
ReplaySubject stores the emitted values in a buffer, which can be specified as a maximum number of values or a maximum duration. When a new subscriber subscribes to the ReplaySubject, it immediately receives all the buffered values.
This is different from the regular Subject, which only emits values to subscribers that were subscribed at the time of the emission. ReplaySubject is useful in scenarios where late subscribers need access to previously emitted values.
Overall, ReplaySubject provides a way to cache and replay the emitted values to both current and future subscribers, making it a powerful tool for managing data streams in reactive programming.
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