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# `diff()`
The diff method compares the collection against another collection or a plain array based on its values. This method will return the values in the original collection that are not present in the given collection:
```js
const collection = collect([1, 2, 3, 4, 5]);
const diff = collection.diff([1, 2, 3, 9]);
diff.all();
// [4, 5]
```
[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/diff.js)