| [ Web Proxy ] |
| Viewing: https://developer.mozilla.org/ko/docs/Web/JavaScript/Reference/Global_Objects/AsyncGenerator | [Back] [Original] |
Get to know MDN better
This page was translated from English by the community. Learn more and join the MDN Web Docs community.
This feature is well established and works across many devices and browser versions. Its been available across browsers since 2020 1.
AsyncGenerator async generator function , .
Promise .
AsyncGenerator AsyncIterator .
async function* foo() {
yield await Promise.resolve("a");
yield await Promise.resolve("b");
yield await Promise.resolve("c");
}
let str = "";
async function generate() {
for await (const val of foo()) {
str = str + val;
}
console.log(str);
}
generate();
// Expected output: "abc"
AsyncGenerator JavaScript . AsyncGenerator .
async function* createAsyncGenerator() {
yield await Promise.resolve(1);
yield await Promise.resolve(2);
yield await Promise.resolve(3);
}
const asyncGen = createAsyncGenerator();
asyncGen.next().then((res) => console.log(res.value)); // 1
asyncGen.next().then((res) => console.log(res.value)); // 2
asyncGen.next().then((res) => console.log(res.value)); // 3
, . AsyncGenerator.prototype , AsyncGeneratorFunction JavaScript AsyncGeneratorFunction.prototype.prototype . AsyncGenerator AsyncGeneratorFunction.prototype.prototype .
AsyncGenerator.prototype AsyncGenerator .
AsyncGenerator.prototype.constructor . AsyncGenerator AsyncGeneratorFunction.prototype.
:
AsyncGenerator .
AsyncGenerator.prototype[@@toStringTag]@@toStringTag "AsyncGenerator". Object.prototype.toString() .
AsyncGenerator.prototype.next()AsyncGenerator.prototype.return() return try...finally .
AsyncGenerator.prototype.throw() throw .
. 1~6 . for await...of .
// . .
function delayedValue(time, value) {
return new Promise((resolve /*, reject*/) => {
setTimeout(() => resolve(value), time);
});
}
async function* generate() {
yield delayedValue(2000, 1);
yield delayedValue(100, 2);
yield delayedValue(500, 3);
yield delayedValue(250, 4);
yield delayedValue(125, 5);
yield delayedValue(50, 6);
console.log("All done!");
}
async function main() {
for await (const value of generate()) {
console.log("value", value);
}
}
main().catch((e) => console.error(e));
| Specification |
|---|
| ECMAScript 2027 LanguageSpecification # sec-asyncgenerator-objects |
This page was last modified on 2025 10 9 by MDN contributors.
AsyncGeneratorAsyncIteratorObject/FunctionObject.prototype.__defineGetter__()Object.prototype.__defineSetter__()Object.prototype.__lookupGetter__()Object.prototype.__lookupSetter__()Object.prototype.hasOwnProperty()Object.prototype.isPrototypeOf()Object.prototype.propertyIsEnumerable()Object.prototype.toLocaleString()Object.prototype.toString()Object.prototype.valueOf()Your blueprint for a better internet.
Portions of this content are 19982026 by individual mozilla.org contributors. Content available under a Creative Commons license.
| Web Proxy Viewer | New URL | Original Page |