GeneratorFunction() constructor
Baseline
Widely available
This feature is well established and works across many devices and browser versions. It’s been available across browsers since September 2016.
The GeneratorFunction() constructor creates GeneratorFunction objects.
Note that GeneratorFunction is not a global object. It can be obtained with the following code:
js
const GeneratorFunction = function* () {}.constructor;
The GeneratorFunction() constructor is not intended to be used directly, and all caveats mentioned in the Function() description apply to GeneratorFunction().
Syntax
js
new GeneratorFunction(functionBody)
new GeneratorFunction(arg1, functionBody)
new GeneratorFunction(arg1, arg2, functionBody)
new GeneratorFunction(arg1, arg2, /* …, */ argN, functionBody)
GeneratorFunction(functionBody)
GeneratorFunction(arg1, functionBody)
GeneratorFunction(arg1, arg2, functionBody)
GeneratorFunction(arg1, arg2, /* …, */ argN, functionBody)
Note:
GeneratorFunction() can be called with or without new. Both create a new GeneratorFunction instance.
Parameters
See Function().
Examples
Creating and using a GeneratorFunction() constructor
js
const GeneratorFunction = function* () {}.constructor;
const g = new GeneratorFunction("a", "yield a * 2");
const iterator = g(10);
console.log(iterator.next().value); // 20
Specifications
| Specification |
|---|
| ECMAScript® 2026 Language Specification # sec-generatorfunction-constructor |
Browser compatibility
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