hello-async.js

class Hello {
  async greet() {
    return new Promise(res => {
      setTimeout(() => res("Hallo Welt"), 1000);
    });
  }
}

const hello = new Hello();
(async () => {
  try {
    const greet = await hello.greet();
    console.log("Greet: " + greet);
  } catch (e) {
    console.error("could not start: ", e);
  }
})();