AsyncIterator

20201

AsyncIterator next() promiseAsyncIterator.prototype [Symbol.asyncIterator]()

AsyncIterator AsyncIterator.prototype

const AsyncIteratorPrototype = Object.getPrototypeOf(
  Object.getPrototypeOf(Object.getPrototypeOf((async function* () {})())),
);

JavaScript AsyncGenerator web API ReadableStream

next() AsyncIterator.prototype [Symbol.asyncIterator]()

AsyncIterator.prototype [Symbol.iterator]()

AsyncIterator.prototype[Symbol.asyncIterator]()

for await...of

const asyncIterator = (async function* () {
  yield 1;
  yield 2;
  yield 3;
})();
(async () => {
  for await (const value of asyncIterator) {
    console.log(value);
  }
})();
// 123


ECMAScript 2027 LanguageSpecification # sec-asynciteratorprototype

async function*

MDN

20251023 MDN

GitHub

JavaScript
AsyncIterator
1. [Symbol.asyncDispose]()
2. AsyncIterator.prototype[Symbol.asyncIterator]()
Object/Function
1. Object.prototype.__proto__
2. Object.prototype.constructor