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