Set (initial support)Baseline · Widely available

Set objects store unique values of any type.

Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Jul 29, 2015. Widely available since Jan 29, 2018.

How to use ↓Compare browsers

Browser support

DesktopChrome

1–37Not supported

38+Supportedsince Oct 7, 2014

Current: 155

Edge

12+Supportedsince Jul 29, 2015

Current: 154

Firefox

1–12Not supported

13+Supportedsince Jun 5, 2012

Current: 157

Safari

1–7Not supported

8+Supportedsince Oct 16, 2014

Current: 27

MobileChrome Android

18–37Not supported

38+Supportedsince Oct 8, 2014

Current: 155

Firefox Android

4–10Not supported

14+Supportedsince Jun 26, 2012

Current: 157

Safari iOS

1–7Not supported

8+Supportedsince Sep 17, 2014

Current: 27

How to use

This feature is Baseline widely available — use it freely, no fallback needed.

Example

Full syntax and examples are on MDN: Set.

Feature detection

JS · check before using

if (typeof Set !== "undefined") {
  // Set is available
}

Documentation (MDN)

Specification

tc39.es#sec-set-objects ↗

Sub-features

Support for each part of the feature (16). The overall table above shows when the whole feature works.

Sub-feature	Chrome	Edge	Firefox	Safari	Chrome Android	Firefox Android	Safari iOS
Set	38	12	13	8	38	14	8
Set.@@iterator	43	12	36	9	43	36	9
Set.@@species	51	13	41	10	51	41	10
Set.Set	38	12	13	8	38	14	8
Set.Set.iterable_allowed	38	12	13	9	38	14	9
Set.Set.null_allowed	38	12	37	9	38	37	9
Set.add	38	12	13	8	38	14	8
Set.clear	38	12	19	8	38	19	8
Set.delete	38	12	13	8	38	14	8
Set.entries	38	12	24	8	38	24	8
Set.forEach	38	12	25	8	38	25	8
Set.has	38	12	13	8	38	14	8
Set.key_equality_for_zeros	38	12	29	9	38	29	9
Set.keys	38	12	24	8	38	24	8
Set.size	38	12	19	8	38	19	8
Set.values	38	12	24	8	38	24	8