> For the complete documentation index, see [llms.txt](https://junwoo45.gitbook.io/learn-rxjs-korean/llms.txt). Markdown versions of documentation pages are available by appending `.md` to page URLs; this page is available as [Markdown](https://junwoo45.gitbook.io/learn-rxjs-korean/learn-rxjs/recipes-1/conditional/defaultifempty.md).

# defaultIfEmpty

#### signature: `defaultIfEmpty(defaultValue: any): Observable`

## Emit given value if nothing is emitted before completion.

### Examples

**Example 1: Default for empty value**

( [Stackblitz](https://stackblitz.com/edit/typescript-3btzml?file=index.ts\&devtoolsheight=100) | [jsBin](http://jsbin.com/yawumoqatu/1/edit?js,console) | [jsFiddle](https://jsfiddle.net/btroncone/8ex96cov/) )

```javascript
// RxJS v6+
import { defaultIfEmpty } from 'rxjs/operators';
import { of } from 'rxjs';

//emit 'Observable.of() Empty!' when empty, else any values from source
const exampleOne = of().pipe(defaultIfEmpty('Observable.of() Empty!'));
//output: 'Observable.of() Empty!'
const subscribe = exampleOne.subscribe(val => console.log(val));
```

**Example 2: Default for Observable.empty**

( [Stackblitz](https://stackblitz.com/edit/typescript-tyfjhu?file=index.ts\&devtoolsheight=100) | [jsBin](http://jsbin.com/kojafuvesu/1/edit?js,console) | [jsFiddle](https://jsfiddle.net/btroncone/3edw828p/) )

```javascript
// RxJS v6+
import { defaultIfEmpty } from 'rxjs/operators';
import { empty } from 'rxjs';

//emit 'Observable.empty()!' when empty, else any values from source
const example = empty().pipe(defaultIfEmpty('Observable.empty()!'));
//output: 'Observable.empty()!'
const subscribe = example.subscribe(val => console.log(val));
```

### Additional Resources

* [defaultIfEmpty](https://rxjs.dev/api/operators/defaultIfEmpty)

  :newspaper: - Official docs

> :file\_folder: Source Code: <https://github.com/ReactiveX/rxjs/blob/master/src/internal/operators/defaultIfEmpty.ts>