The Set 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 »
const letters = new Set(["a","b","c"]);
// Does the Set contain "d"?
answer = letters.has("d");
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.
The value to test for.
Return Value
Type
Description
Boolean
true if the value exists, otherwise false.
Related Set Methods:
See Also:
Browser Support
set.has() is an ECMAScript6 (ES6 2015) feature.
JavaScript 2015 is supported in all browsers since June 2017:
| Chrome 51 |
Edge 15 |
Firefox 54 |
Safari 10 |
Opera 38 |
| May 2016 | Apr 2017 | Jun 2017 | Sep 2016 | Jun 2016 |