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javascript/snippets/negate.md

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+---
+title: Negate predicate
+type: snippet
+tags: [function]
+cover: blue-bird
+dateModified: 2020-09-15T16:28:04+03:00
+---
+
+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 ]
+```