Await/Async example. A function marked as "async" is no longer a regular function but an AsyncFunction that wraps whatever it returns in a Promise.

await-async-example.js

function slowGreeting(timeout) {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      resolve('Hello WorldzZzZzzz');
    }, timeout);
  })
}

// Assigns the promise value to a variable and returns the variable:
async function getSlowGreeting() {
  const greeting = await slowGreeting(1000);
  return greeting;
}

// Returns the promise as a value:
async function getAnotherSlowGreeting() {
  return slowGreeting(2000);
}

getSlowGreeting().then((greeting) => {
  console.log(`getSlowGreeting: ${greeting}`);
});

getAnotherSlowGreeting().then(greeting => {
  console.log(`getAnotherSlowGreeting: ${greeting}`);
})