JavaScript Set has()
The has() Method
Example
// Create a Set
const letters = new Set(["a","b","c"]);
// Does the Set contain "d"?
answer = letters.has("d");
Try it Yourself »
Description
The has() method returns true if a specified value exists in a set.
Syntax
set.has(value)
Parameters
| Parameter | Description |
| value | Required. The value to test for. |
Return Value
| Type | Description |
| Boolean | true if the value exists, otherwise false. |
Browser Support
set.has() is an ECMAScript6 (ES6) feature.
ES6 (JavaScript 2015) is supported in all modern browsers since June 2017:
| Chrome 51 | Edge 15 | Firefox 54 | Safari 10 | Opera 38 |
| May 2016 | Apr 2017 | Jun 2017 | Sep 2016 | Jun 2016 |
set.has() is not supported in Internet Explorer.
