JavaScript (ES2026) reference · Array Methods

JavaScript Array.fromAsync() Method

Create an array from an async iterable or iterable of promises, awaiting each element. Returns a promise.

JavaScript (ES2026) Since ES2026

Syntax

Array.fromAsync(items, mapFn, thisArg)

Parameter	Description
`items`	An async iterable, or an iterable/array-like whose values may be promises.
`mapFn` optional	Called on each awaited element.

A promise for a new array.

Collect an async generatorTry it yourself

async function* countdown() {
  yield 3; yield 2; yield 1;
}
console.log(await Array.fromAsync(countdown()));

Output

[ 3, 2, 1 ]

Await a list of promises in orderTry it yourself

const values = await Array.fromAsync([Promise.resolve(1), 2, Promise.resolve(3)]);
console.log(values);

Output

[ 1, 2, 3 ]

Version	Change
JavaScript ES2026	Added

Array.from() · Create a new array from an iterable or array-like object, with an optional function to map each element.
JavaScript Arrays · tutorial
JavaScript Array Methods · tutorial