const sayHello = () => {
  return new Promise( (resolve, reject) => {
    setTimeout(() => {
      resolve('Hello world');
    }, 500);
  });
}

// Declaring an async function
const printHelloWorld = async () => {
  // Waiting for the promise to be resolved
  result = await sayHello();
  console.log(result);
}

printHelloWorld();