function* gen() {
  yield* [1, 2, 3].map(x => x * 2);
}

const iterator = gen();
console.log(iterator.next().value);
console.log(iterator.next().value);
console.log(iterator.next().value);
console.log(iterator.next().value);

console.log(MyClass);
class MyClass {
  constructor() {
    this.value = 42;
  }
}

async function foo() {
  console.log('Start');
  await Promise.resolve().then(() => {
    console.log('Inside Promise');
  });
  console.log('End');
}

foo();
console.log('Outside');