30-seconds-of-code
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A collection of useful JavaScript snippets.
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### filterNonUnique
Filters out the non-unique values in an array.
Use `Array.filter()` for an array containing only the unique values.
```js
const filterNonUnique = arr => arr.filter(i => arr.indexOf(i) === arr.lastIndexOf(i));
```
```js
filterNonUnique([1, 2, 2, 3, 4, 4, 5]); // [1,3,5]
```