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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)