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# `whenNotEmpty()`
The `whenNotEmpty` method will execute the given callback when the collection is not empty:
```js
const collection = collect(['Sadio Mané']);
collection.whenNotEmpty(c => c.push('Mohamed Salah'));
collection.all();
// [
// 'Sadio Mané',
// 'Mohamed Salah',
// ]
```
```js
const collection = collect(['Sadio Mané']);
collection.whenNotEmpty(
c => c.push('Mohamed Salah'),
c => c.push('Xherdan Shaqiri'),
);
collection.all();
// [
// 'Sadio Mané',
// 'Mohamed Salah',
// ];
```
[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/whenNotEmpty.js)