Array iteration methodsBaseline · Widely available
Array iteration methods
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.
Browser support
DesktopChrome
1–2Not supported
3+Supportedsince Sep 15, 2009
Current: 155Edge
12+Supportedsince Jul 29, 2015
Current: 154Firefox
1–2Not supported
3+Supportedsince Jun 17, 2008
Current: 157Safari
1–3.1Not supported
4+Supportedsince Jun 8, 2009
Current: 27MobileChrome Android
18+Supportedsince Jun 27, 2012
Current: 155Firefox Android
4+Supportedsince Mar 29, 2011
Current: 157Safari iOS
1–3Not supported
3.2+Supportedsince Apr 3, 2010
Current: 27How to use
This feature is Baseline widely available — use it freely, no fallback needed.
Example
Full syntax and examples are on MDN: every.
Feature detection
JS · check before using
if ("every" in Array || ("prototype" in Array && "every" in Array.prototype)) {
// Array.every is available
}Documentation (MDN)
Specification
- tc39.es#sec-array.prototype.every ↗
- tc39.es#sec-array.prototype.filter ↗
- tc39.es#sec-array.prototype.foreach ↗
- tc39.es#sec-array.prototype.indexof ↗
- tc39.es#sec-array.prototype.lastindexof ↗
- tc39.es#sec-array.prototype.map ↗
- tc39.es#sec-array.prototype.reduce ↗
- tc39.es#sec-array.prototype.reduceright ↗
- tc39.es#sec-array.prototype.some ↗
Sub-features
Support for each part of the feature (9). The overall table above shows when the whole feature works.
| Sub-feature | Chrome | Edge | Firefox | Safari | Chrome Android | Firefox Android | Safari iOS |
|---|---|---|---|---|---|---|---|
| Array.every | 1 | 12 | 1.5 | 3 | 18 | 4 | 1 |
| Array.filter | 1 | 12 | 1.5 | 3 | 18 | 4 | 1 |
| Array.forEach | 1 | 12 | 1.5 | 3 | 18 | 4 | 1 |
| Array.indexOf | 1 | 12 | 1.5 | 3 | 18 | 4 | 1 |
| Array.lastIndexOf | 1 | 12 | 1.5 | 3 | 18 | 4 | 1 |
| Array.map | 1 | 12 | 1.5 | 3 | 18 | 4 | 1 |
| Array.reduce | 3 | 12 | 3 | 4 | 18 | 4 | 3.2 |
| Array.reduceRight | 3 | 12 | 3 | 4 | 18 | 4 | 3.2 |
| Array.some | 1 | 12 | 1.5 | 3 | 18 | 4 | 1 |