The legacy generator function expression was a SpiderMonkey-specific feature, which is removed in Firefox 58+. For future-facing usages, consider using the
function* expression. Obsolete since Gecko 58 (Firefox 58 / Thunderbird 58 / SeaMonkey 2.55)
This feature is obsolete. Although it may still work in some browsers, its use is discouraged since it could be removed at any time. Try to avoid using it.
The function keyword can be used to define a legacy generator function inside an expression. To make the function a legacy generator, the function body should contain at least one yield expression.
Syntax
function [name]([param1[, param2[, ..., paramN]]]) {
statements
}
Parameters
name- The function name. Can be omitted, in which case the function is anonymous. The name is only local to the function body.
paramN- The name of an argument to be passed to the function. A function can have up to 255 arguments.
statements- The statements which comprise the body of the function. This should contain at least one
yieldexpression.
Description
An overview of the usage is available on the Iterators and Generators page.
Browser compatibility
The compatibility table on this page is generated from structured data. If you'd like to contribute to the data, please check out https://github.com/mdn/browser-compat-data and send us a pull request.
| Feature | Chrome | Edge | Firefox | Internet Explorer | Opera | Safari |
|---|---|---|---|---|---|---|
| Basic support | No | No | 2 — 58 | No | No | No |
| Feature | Android webview | Chrome for Android | Edge mobile | Firefox for Android | Opera Android | iOS Safari | Samsung Internet |
|---|---|---|---|---|---|---|---|
| Basic support | No | No | No | 4 — 58 | No | No | No |