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