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Angelos Chalaris
2020-09-15 16:28:04 +03:00
parent 040efd4380
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6
snippets/uniqueElementsByRight.md
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@ -5,8 +5,8 @@ tags: array,function,intermediate
Returns all unique values of an array, based on a provided comparator function, starting from the right.
Use `Array.prototype.reduceRight()` and `Array.prototype.some()` for an array containing only the last 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.
- Use `Array.prototype.reduceRight()` and `Array.prototype.some()` for an array containing only the last 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
const uniqueElementsByRight = (arr, fn) =>
@ -27,4 +27,4 @@ uniqueElementsByRight(
],
(a, b) => a.id == b.id
); // [ { id: 0, value: 'e' }, { id: 1, value: 'd' }, { id: 2, value: 'c' } ]
```
```