# toPromise

#### signature: `toPromise() : Promise`

## Convert observable to promise.

***

⚠ `toPromise` is not a pipable operator, as it does not return an observable.

***

### Examples

**Example 1: Basic Promise**

( [jsBin](http://jsbin.com/favoqecixi/1/edit?js,console) | [jsFiddle](https://jsfiddle.net/btroncone/thykc9up/) )

```js
//return basic observable
const sample = val => Rx.Observable.of(val).delay(5000);
//convert basic observable to promise
const example = sample('First Example')
  .toPromise()
  //output: 'First Example'
  .then(result => {
    console.log('From Promise:', result);
  });
```

**Example 2: Using Promise.all**

( [jsBin](http://jsbin.com/hutiyicaco/1/edit?js,console) | [jsFiddle](https://jsfiddle.net/btroncone/xzu6u7hs/) )

```js
//return basic observable
const sample = val => Rx.Observable.of(val).delay(5000);
/*
  convert each to promise and use Promise.all
  to wait for all to resolve
*/
const example = () => {
  return Promise.all([
    sample('Promise 1').toPromise(),
    sample('Promise 2').toPromise()
  ]);
};
//output: ["Promise 1", "Promise 2"]
example().then(val => {
  console.log('Promise.all Result:', val);
});
```

### Additional Resources

* [toPromise](https://github.com/Reactive-Extensions/RxJS/blob/master/doc/api/core/operators/topromise.md) 📰 - Official Docs

***

> 📁 Source Code: <https://github.com/ReactiveX/rxjs/blob/master/packages/rxjs/src/internal/operators/toPromise.ts>


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