Generator

20169

Generator

Generator Iterator

const foo = function* () {
  yield "a";
  yield "b";
  yield "c";
};

let str = "";
for (const val of foo()) {
  str = str + val;
}

console.log(str);
// Expected output: "abc"

Generator Generator

function* generator() {
  yield 1;
  yield 2;
  yield 3;
}

const gen = generator(); // "Generator { }"

console.log(gen.next().value); // 1
console.log(gen.next().value); // 2
console.log(gen.next().value); // 3

Generator JavaScript Generator.prototype GeneratorFunction.prototype.prototype GeneratorFunction JavaScript

Generator.prototype Generator

Generator.prototype.constructor: Generator GeneratorFunction.prototype

Generator
Generator.prototype[Symbol.toStringTag]: [Symbol.toStringTag] "Generator" Object.prototype.toString()

Iterator

Generator.prototype.next(): yield
Generator.prototype.return(): return try...finally
Generator.prototype.throw(): throw

function* infinite() {
  let index = 0;

  while (true) {
    yield index++;
  }
}

const generator = infinite(); // "Generator { }"

console.log(generator.next().value); // 0
console.log(generator.next().value); // 1
console.log(generator.next().value); // 2
//


ECMAScript 2027 LanguageSpecification # sec-generator-objects

MDN

20251023 MDN

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