The add() method appends a new element with a specified value to the end of a Set object.
Syntax
mySet.add(value);Parameters
- value
- Required. The value of the element to add to the
Setobject.
Return value
The Set object.
Examples
Using the add method
var mySet = new Set();
mySet.add(1);
mySet.add(5).add("some text"); // chainable
console.log(mySet);
// Set [1, 5, "some text"]
Specifications
| Specification | Status | Comment |
|---|---|---|
| ECMAScript 2015 (6th Edition, ECMA-262) The definition of 'Set.prototype.add' in that specification. |
Standard | Initial definition. |
| ECMAScript 2017 Draft (ECMA-262) The definition of 'Set.prototype.add' in that specification. |
Draft |
Browser compatibility
| Feature | Chrome | Firefox (Gecko) | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|
| Basic support | 38 | 13.0 (13.0) | 11 | 25 | 7.1 |
| Feature | Android | Chrome for Android | Firefox Mobile (Gecko) | IE Mobile | Opera Mobile | Safari Mobile |
|---|---|---|---|---|---|---|
| Basic support | No support | 38 | 13.0 (13.0) | No support | No support | 8 |
Firefox-specific notes
- Prior to Firefox 33 (Firefox 33 / Thunderbird 33 / SeaMonkey 2.30),
Set.prototype.addreturnedundefinedand was not chainable. This has been fixed (bug 1031632). The behavior can be found in Chrome/v8 as well (issue).