coderef

Array.isArray()Baseline · Widely available

The Array.isArray() static method checks whether a value is an array.

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
1–3Not supported
4+Supportedsince Jan 25, 2010
Current: 155
Edge
12+Supportedsince Jul 29, 2015
Current: 154
Firefox
1–3.6Not supported
4+Supportedsince Mar 22, 2011
Current: 157
Safari
1–4Not supported
5+Supportedsince Jun 7, 2010
Current: 27
MobileChrome Android
18+Supportedsince Jun 27, 2012
Current: 155
Firefox Android
4+Supportedsince Mar 29, 2011
Current: 157
Safari iOS
1–4.2Not supported
5+Supportedsince Oct 12, 2011
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: isArray.

Feature detection

JS · check before using
if ("isArray" in Array || ("prototype" in Array && "isArray" in Array.prototype)) {
  // Array.isArray is available
}

Documentation (MDN)

Specification