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### `Rx.Observable.interval(period, [scheduler])`
[Ⓢ](https://github.com/Reactive-Extensions/RxJS/blob/master/src/core/linq/observable/interval.js "View in source")
Returns an observable sequence that produces a value after each period.
#### Arguments
1. `period` *(`Number`)*: Period for producing the values in the resulting sequence (specified as an integer denoting milliseconds).
2. `[scheduler]` *(Scheduler=Rx.Scheduler.timeout)*: Scheduler to run the timer on. If not specified, Rx.Scheduler.timeout is used.
#### Returns
*(`Observable`)*: An observable sequence that produces a value after each period.
#### Example
```js
var source = Rx.Observable
.interval(500 /* ms */)
.timeInterval()
.take(3);
var subscription = source.subscribe(
function (x) {
console.log('Next: ' + x);
},
function (err) {
console.log('Error: ' + err);
},
function () {
console.log('Completed');
});
// => Next: {value: 0, interval: 500}
// => Next: {value: 1, interval: 500}
// => Next: {value: 2, interval: 500}
// => Completed
```
### Location
File:
- [/src/core/linq/observable/interval.js](https://github.com/Reactive-Extensions/RxJS/blob/master/src/core/linq/observable/interval.js)
Dist:
- [`rx.lite.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.lite.js)
- [`rx.lite.compat.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.lite.compat.js)
- [`rx.time.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.time.js)
Prerequisites:
- if `rx.time.js`
- [`rx.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.js) | [`rx.compat.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.compat.js)
- [`rx.lite.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.lite.js) | [`rx.lite.compat.js`](https://github.com/Reactive-Extensions/RxJS/blob/master/dist/rx.lite.compat.js)
NPM Packages:
- [`rx`](https://www.npmjs.org/package/rx)
NuGet Packages:
- [`RxJS-All`](https://www.npmjs.org/package/RxJS-Time)
- [`RxJS-Time`](https://www.npmjs.org/package/RxJS-Time)
- [`RxJS-Lite`](http://www.nuget.org/packages/RxJS-Lite/)
Unit Tests:
- [/tests/observable/interval.js](https://github.com/Reactive-Extensions/RxJS/blob/master/tests/observable/interval.js)
|
