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# `duplicates()`
The duplicates method retrieves and returns duplicate values from the collection:
```js
const collection = collect(['a', 'b', 'a', 'c', 'b']);
const duplicates = collection.duplicates();
duplicates.all();
// { 2: 'a', 4: 'b' }
```
[View source on GitHub](https://github.com/ecrmnn/collect.js/blob/master/src/methods/duplicates.js)