argN Optional

Names to be used by the function as formal argument names. Each must be a string that corresponds to a valid JavaScript parameter (any of plain identifier, rest parameter, or destructured parameter, optionally with a default), or a list of such strings separated with commas.

As the parameters are parsed in the same way as function declarations, whitespace and comments are accepted. For example: "x", "theValue = 42", "[a, b] /* numbers */" — or "x, theValue = 42, [a, b] /* numbers */". ("x, theValue = 42", "[a, b]" is also correct, though very confusing to read.)

functionBody

A String containing the JavaScript statements comprising the function definition.

Async generator function objects created with the AsyncGeneratorFunction constructor are parsed when the function is created. This is less efficient than declaring a generator function with an async function* expression and calling it within your code, because such functions are parsed with the rest of the code.

All arguments passed to the function, except the last, are treated as the names of the identifiers of the parameters in the function to be created, in the order in which they are passed.

Invoking the AsyncGeneratorFunction constructor as a function (without using the new operator) has the same effect as invoking it as a constructor.

The following example uses the AsyncGeneratorFunction constructor to create an async generator function.

const AsyncGeneratorFunction = (async function* () {}).constructor;
const createAsyncGenerator = new AsyncGeneratorFunction('a', 'yield a * 2');
const asyncGen = createAsyncGenerator(10);
asyncGen.next().then((res) => console.log(res.value)); // 20

• function*
• async function*
• function* expression
• AsyncGenerator
• Generator
• GeneratorFunction
• AsyncFunction
• Iterators and generators
• Functions