Javascript fetch JSON with ES7 Async Await

es7-async-await.js

// Async/Await requirements: Latest Chrome/FF browser or Babel: https://babeljs.io/docs/plugins/transform-async-to-generator/
// Fetch requirements: Latest Chrome/FF browser or Github fetch polyfill: https://github.com/github/fetch

// async function
async function fetchAsync () {
  // await response of fetch call
  let response = await fetch('https://api.github.com');
  // only proceed once promise is resolved
  let data = await response.json();
  // only proceed once second promise is resolved
  return data;
}

// trigger async function
// log response or catch error of fetch promise
fetchAsync()
    .then(data => console.log(data))
    .catch(reason => console.log(reason.message))

(async () => {
  'use strict';
  console.clear();
  const getUser = async identifier => await (await fetch(`https://jsonplaceholder.typicode.com/users/${identifier}`)).json();
  try {
    const firstUser = await getUser(1);
    console.log(firstUser);
    const secondUser = await getUser(2);
    console.log(secondUser);
    // there are 10 users in JSONPlaceholder/Users
  } catch (exception) {
    console.error(`Failed to retrieve user informations: (${exception})`);
  }
})();