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Chalarangelo
2021-10-13 20:09:28 +03:00
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snippets/uniqueElementsBy.md
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title: uniqueElementsBy
tags: array,intermediate
firstSeen: 2018-07-18T20:49:07+03:00
lastUpdated: 2020-10-22T20:24:44+03:00
lastUpdated: 2021-10-13T19:29:39+02:00
---
Finds all unique values of an array, based on a provided comparator function.
- Use `Array.prototype.reduce()` and `Array.prototype.some()` for an array containing only the first unique occurrence of each value, based on the comparator function, `fn`.
- Use `Array.prototype.reduce()` and `Array.prototype.some()` to create an array containing only the first unique occurrence of each value, based on the comparator function, `fn`.
- The comparator function takes two arguments: the values of the two elements being compared.
```js