Example to delegate to another generator function using yield*

delegate-to-another-generator.js

function* secondGenerator(a) {
    yield (a + 1);
    yield (a + 2);
    yield (a + 3);
}

function* firstGenerator(a) {
    yield a;
    yield* secondGenerator(a);
    yield (a + 10);
}

let generator = firstGenerator(10);

console.log(generator.next().value); // 10 - {value: 10, done: false}
console.log(generator.next().value); // 11 - {value: 11, done: false}
console.log(generator.next().value); // 12 - {value: 12, done: false}
console.log(generator.next().value); // 13 - {value: 13, done: false}
console.log(generator.next().value); // 20 - {value: 20, done: true}