17 lines
307 B
Markdown
17 lines
307 B
Markdown
---
|
|
title: negate
|
|
tags: function,beginner
|
|
---
|
|
|
|
Negates a predicate function.
|
|
|
|
- Take a predicate function and apply the not operator (`!`) to it with its arguments.
|
|
|
|
```js
|
|
const negate = func => (...args) => !func(...args);
|
|
```
|
|
|
|
```js
|
|
[1, 2, 3, 4, 5, 6].filter(negate(n => n % 2 === 0)); // [ 1, 3, 5 ]
|
|
```
|