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View File Name : unless.md

# `unless()`

The unless method will execute the given callback when the first argument given to the method evaluates to false:

```js
const collection = collect([1, 2, 3]);

collection.unless(false, items => items.push(4));

collection.all();

// [1, 2, 3, 4]
```

[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/unless.js)