GeneratorsBaseline · Widely available

Generator functions (function*) create iterators that return multiple values, one after another, on-demand.

Supported in all major browsers for at least 30 months — safe to use without fallbacks. Baseline since Sep 20, 2016. Widely available since Mar 20, 2019.

How to use ↓Compare browsers

Browser support

DesktopChrome

1–38Not supported

39+Supportedsince Nov 18, 2014

Current: 155

Edge

12–12Not supported

13+Supportedsince Nov 12, 2015

Current: 154

Firefox

1–25Not supported

26+Supportedsince Dec 10, 2013

Current: 157

Safari

1–9.1Not supported

10+Supportedsince Sep 20, 2016

Current: 27

MobileChrome Android

18–38Not supported

39+Supportedsince Nov 12, 2014

Current: 155

Firefox Android

4–25Not supported

26+Supportedsince Dec 10, 2013

Current: 157

Safari iOS

1–9.3Not supported

10+Supportedsince Sep 13, 2016

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: Generator.

Feature detection

JS · check before using

// Syntax can't be tested with an if-statement — an unsupported
// browser fails to parse the whole script. Either transpile for older
// targets (e.g. Babel/TypeScript/esbuild), or probe in isolation:
let supported = true;
try {
  new Function("/* code that uses the syntax */");
} catch {
  supported = false;
}

This is a language syntax feature.

Documentation (MDN)

Specification

Usage share

caniuse.com/es6-generators ↗

Sub-features

Support for each part of the feature (14). The overall table above shows when the whole feature works.

Sub-feature	Chrome	Edge	Firefox	Safari	Chrome Android	Firefox Android	Safari iOS
Generator	39	13	26	10	39	26	10
Generator.next	39	13	26	10	39	26	10
Generator.return	50	13	38	10	50	38	10
Generator.throw	39	13	26	10	39	26	10
GeneratorFunction	39	13	26	10	39	26	10
GeneratorFunction.GeneratorFunction	39	13	26	10	39	26	10
generator_function	49	12	26	10	49	26	10
generator_function.trailing_comma	58	79	52	10	58	52	10
yield	39	12	26	10	39	26	10
yield_star	39	12	27	10	39	27	10
generator_function	39	13	26	10	39	26	10
generator_function.IteratorResult_object	49	13	29	10	49	29	10
generator_function.not_constructable_with_new	50	13	43	10	50	43	10
generator_function.trailing_comma_in_parameters	58	14	52	10	58	52	10