22 lines
679 B
Markdown
22 lines
679 B
Markdown
---
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title: Reject non-matching values
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tags: array
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cover: blog_images/interior-7.jpg
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firstSeen: 2018-04-27T03:17:15+03:00
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lastUpdated: 2020-10-22T20:24:04+03:00
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---
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Filters an array's values based on a predicate function, returning only values for which the predicate function returns `false`.
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- Use `Array.prototype.filter()` in combination with the predicate function, `pred`, to return only the values for which it returns `false`.
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```js
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const reject = (pred, array) => array.filter((...args) => !pred(...args));
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```
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```js
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reject(x => x % 2 === 0, [1, 2, 3, 4, 5]); // [1, 3, 5]
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reject(word => word.length > 4, ['Apple', 'Pear', 'Kiwi', 'Banana']);
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// ['Pear', 'Kiwi']
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```
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