20 lines
404 B
Markdown
20 lines
404 B
Markdown
---
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title: Negate predicate
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tags: function
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expertise: beginner
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firstSeen: 2017-12-24T08:28:52+02:00
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lastUpdated: 2020-09-15T16:28:04+03:00
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---
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Negates a predicate function.
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- Take a predicate function and apply the not operator (`!`) to it with its arguments.
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```js
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const negate = func => (...args) => !func(...args);
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```
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```js
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[1, 2, 3, 4, 5, 6].filter(negate(n => n % 2 === 0)); // [ 1, 3, 5 ]
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```
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