The has()
method returns a boolean indicating whether an element with the specified value exists in a Set
object or not.
Syntax
mySet.has(value);
Parameters
- value
- Required. The value to test for presence in the
Set
object.
Return value
- Boolean
- Returns
true
if an element with the specified value exists in theSet
object; otherwisefalse
.
Examples
Using the has
method
var mySet = new Set(); mySet.add('foo'); mySet.has('foo'); // returns true mySet.has('bar'); // returns false
Specifications
Specification | Status | Comment |
---|---|---|
ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Set.prototype.has' in that specification. |
Standard | Initial definition. |
ECMAScript Latest Draft (ECMA-262) The definition of 'Set.prototype.has' in that specification. |
Draft |
Browser compatibility
Feature | Chrome | Edge | Firefox (Gecko) | Internet Explorer | Opera | Safari |
---|---|---|---|---|---|---|
Basic support | 38 | (Yes) | 13.0 (13.0) | 11 | 25 | 7.1 |
Feature | Android | Chrome for Android | Edge | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
---|---|---|---|---|---|---|---|
Basic support | No support | 38 | (Yes) | 13.0 (13.0) | No support | No support | 8 |