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# `whenEmpty()`
The `whenEmpty` method will execute the given callback when the collection is empty:
```js
const collection = collect([]);
collection.whenEmpty(c => c.push('Mohamed Salah'));
collection.all();
// ['Mohamed Salah']
```
```js
const collection = collect(['Darwin Núñez']);
collection.whenEmpty(
c => c.push('Mohamed Salah'),
c => c.push('Xherdan Shaqiri'),
);
collection.all();
// [
// 'Darwin Núñez',
// 'Xherdan Shaqiri',
// ];
```
[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/whenEmpty.js)