Web/JavaScript/Reference/Global objects/Set/add

The add() method appends a new element with a specified value to the end of a Set object.

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Syntax

mySet.add(value);

Parameters

value

The value of the element to add to the Set object.

Return value

The Set object with added value.

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

Browser compatibility

The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.

Update compatibility data on GitHub

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	Android webview	Chrome for Android	Firefox for Android	Opera for Android	Safari on iOS	Samsung Internet	Node.js
add	Chrome Full support 38	Edge Full support 12	Firefox Full support 13	IE Partial support 11 Notes' Partial support 11 Notes' Notes' Returns 'undefined' instead of the 'Set' object.	Opera Full support 25	Safari Full support 8	WebView Android Full support 38	Chrome Android Full support 38	Firefox Android Full support 14	Opera Android Full support 25	Safari iOS Full support 8	Samsung Internet Android Full support 3.0	nodejs Full support 0.12 Full support 0.12 Full support 0.10 Disabled' Disabled' From version 0.10: this feature is behind the --harmony runtime flag.

Legend

Full support  

Full support

Partial support  

Partial support

See implementation notes.'

See implementation notes.

User must explicitly enable this feature.'

User must explicitly enable this feature.

See also

• Set
• Set.prototype.delete()
• Set.prototype.has()

Set.prototype.add() by Mozilla Contributors is licensed under CC-BY-SA 2.5.