JavaScript Async-Await

function helloWorld() {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve('Hello World!');
    }, 2000);
  });
}
async function msg() {
  const msg = await helloWorld();
  console.log('Message:', msg);
}
msg(); // Message: Hello World! <-- after 2 seconds

let json = '{ "age": 30 }'; // incomplete data
try {
  let user = JSON.parse(json); // <-- no errors
  console.log( user.name ); // no name!
} catch (e) {
  console.error( "Invalid JSON data!" );
}

function helloWorld() {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve('Hello World!');
    }, 2000);
  });
}
async function msg() {
  const msg = await helloWorld();
  console.log('Message:', msg);
}
msg(); // Message: Hello World! <-- after 2 seconds

let pro1 = Promise.resolve(5);
let pro2 = 44;
let pro3 = new Promise(function(resolve, reject) {
  setTimeout(resolve, 100, 'foo');
});
Promise.all([pro1, pro2, pro3]).then(function(values) {
  console.log(values);
});
// expected => Array [5, 44, "foo"]

function helloWorld() {
  return new Promise(resolve => {
    setTimeout(() => {
      resolve('Hello World!');
    }, 2000);
  });
}
const msg = async function() { //Async Function Expression
  const msg = await helloWorld();
  console.log('Message:', msg);
}
const msg1 = async () => { //Async Arrow Function
  const msg = await helloWorld();
  console.log('Message:', msg);
}
msg(); // Message: Hello World! <-- after 2 seconds
msg1(); // Message: Hello World! <-- after 2 seconds