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

Emit numbers in sequence based on provided timeframe.

​​​​

Examples

Example 1: Emit sequence of values at 1 second interval

( StackBlitz | jsBin | jsFiddle )

// RxJS v6+
import { interval } from 'rxjs';
​
//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));

Related Recipes

• ​Alphabet Invasion Game​

• ​Battleship Game​

• ​Breakout Game​

• ​Car Racing Game​

• ​Catch The Dot Game​

• ​Flappy Bird Game​

• ​Matrix Digital Rain​

• ​Memory Game​

• ​Platform Jumper Game​

• ​Space Invaders Game​

• ​Stop Watch​

• ​Tank Battle Game​

• ​Tetris Game​

• ​Uncover Image Game​

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​