how to use the replaysubject function from the rxjs library in typescript

To use ReplaySubject in TypeScript, you first need to import it from the rxjs library. Then, create a new instance of ReplaySubject and specify the buffer size. You can then call the next() method to push new values to the subject.

Here is an example:

index.ts
import { ReplaySubject } from 'rxjs';

const subject = new ReplaySubject(3); // buffer size of 3

subject.next('First');
subject.next('Second');
subject.next('Third');

subject.subscribe(value => {
  console.log(`Received value: ${value}`);
});

subject.next('Fourth');
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In this example, we create a new instance of ReplaySubject with a buffer size of 3. We then push 3 values to the subject using the next() method. We subscribe to the subject and log any received values. Finally, we push a fourth value to the subject and it will be stored in the buffer.

When the subscriber receives the values, it will receive all the buffered values in the order they were pushed to the subject, followed by any new values pushed after the subscription.

Output:

index.ts
Received value: First
Received value: Second
Received value: Third
Received value: Fourth
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