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 Set object.

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 Latest Draft (ECMA-262)
The definition of 'Set.prototype.add' in that specification.
Draft  

Browser compatibility

Update compatibility data on GitHub
DesktopMobileServer
ChromeEdgeFirefoxInternet ExplorerOperaSafariAndroid webviewChrome for AndroidEdge MobileFirefox for AndroidOpera for AndroidiOS SafariSamsung InternetNode.js
Basic supportChrome Full support 38Edge Full support 12Firefox Full support 13IE Partial support 11
Notes
Partial support 11
Notes
Notes Returns 'undefined' instead of the 'Set' object.
Opera Full support 25Safari Full support 8WebView Android Full support 38Chrome Android Full support 38Edge Mobile Full support 12Firefox Android Full support 14Opera Android Full support 25Safari iOS Full support 8Samsung Internet Android Full support Yesnodejs Full support Yes

Legend

Full support  
Full support
Partial support  
Partial support
See implementation notes.
See implementation notes.

See also

Document Tags and Contributors

Last updated by: wbamberg,