signature: interval(period: number, scheduler: Scheduler): Observable

Emit numbers in sequence based on provided timeframe.

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Examples

Example 1: Emit sequence of values at 1 second interval

( StackBlitz | jsBin | jsFiddle )

// RxJS v6+
import { interval } from 'rxjs';
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//emit value in sequence every 1 second
const source = interval(1000);
//output: 0,1,2,3,4,5....
const subscribe = source.subscribe(val => console.log(val));

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Additional Resources

• ​interval​

  📰 - Official docs

• ​Creation operators: interval and timer​

  🎥 💵 - André Staltz

• ​Build your own interval operator​

  🎥 - Kwinten Pisman

📁 Source Code: https://github.com/ReactiveX/rxjs/blob/master/src/internal/observable/interval.ts​