# interval

#### 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](https://stackblitz.com/edit/typescript-ohddud?file=index.ts\&devtoolsheight=100) | [jsBin](http://jsbin.com/vigohomabo/1/edit?js,console) | [jsFiddle](https://jsfiddle.net/btroncone/x3mrwzr0/) )

```js
// 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](/learn-rxjs/recipes/alphabet-invasion-game.md)
* [Battleship Game](/learn-rxjs/recipes/battleship-game.md)
* [Breakout Game](/learn-rxjs/recipes/breakout-game.md)
* [Car Racing Game](/learn-rxjs/recipes/car-racing-game.md)
* [Catch The Dot Game](/learn-rxjs/recipes/catch-the-dot-game.md)
* [Flappy Bird Game](/learn-rxjs/recipes/flappy-bird-game.md)
* [Matrix Digital Rain](/learn-rxjs/recipes/matrix-digital-rain.md)
* [Memory Game](/learn-rxjs/recipes/memory-game.md)
* [Platform Jumper Game](/learn-rxjs/recipes/platform-jumper-game.md)
* [Space Invaders Game](/learn-rxjs/recipes/space-invaders-game.md)
* [Stop Watch](/learn-rxjs/recipes/stop-watch.md)
* [Tank Battle Game](/learn-rxjs/recipes/tank-battle-game.md)
* [Tetris Game](/learn-rxjs/recipes/tetris-game.md)
* [Uncover Image Game](/learn-rxjs/recipes/uncover-image-game.md)

### Additional Resources

* [interval](https://rxjs.dev/api/index/function/interval) 📰 - Official docs
* [Creation operators: interval and timer](https://egghead.io/lessons/rxjs-creation-operators-interval-and-timer?course=rxjs-beyond-the-basics-creating-observables-from-scratch) 🎥 💵 - André Staltz

***

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


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