Set() constructor

The Set() constructor creates Set objects.

Try it

Syntax

js

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

js

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

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See also