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Set() constructor

The Set lets you create Set objects that store unique values of any type, whether primitive values or object references.

Try it

Syntax

new Set()
new Set(iterable)

Note: Set() can only be constructed with new. Attempting to call it without new throws a TypeError.

Parameters

iterable Optional

If an iterable object is passed, all of its elements will be added to the new Set.

If you don't specify this parameter, or its value is null, the new Set is empty.

Return value

A new Set object.

Examples

Using the `Set` object

const mySet = new Set();

mySet.add(1); // Set [ 1 ]
mySet.add(5); // Set [ 1, 5 ]
mySet.add(5); // Set [ 1, 5 ]
mySet.add('some text'); // Set [ 1, 5, 'some text' ]
const o = { a: 1, b: 2 };
mySet.add(o);

Specifications

Specification
ECMAScript Language Specification # sec-set-constructor

Browser compatibility

	Desktop						Mobile						Server
	Chrome	Edge	Firefox	Internet Explorer	Opera	Safari	WebView Android	Chrome Android	Firefox for Android	Opera Android	Safari on IOS	Samsung Internet	Deno	Node.js
`Set`	38	12	13	11	25	8	38	38	14	25	8	3.0	1.0	0.12.0 0.10.0
`iterable_allowed`	38	12	13	No	25	9	38	38	14	25	9	3.0	1.0	0.12.0
`new_required`	38	12	42	11	25	9	38	38	42	25	9	3.0	1.0	0.12.0
`null_allowed`	38	12	37	11	25	9	38	38	37	25	9	3.0	1.0	0.12.0 0.10.0