sample script with and without Async Await

With Async Await.js

async function start() {
  let x1 = await exe(1);
  console.log("x1", x1);
  let x2 = await exe(2);
  console.log("x2", x2);
}

function exe(n) {
  return new Promise((resolve, reject) => {
    let response;

    setTimeout(() => {
      response = `Success ${n}`;
      resolve(response);
    }, 1000);
  });
}

start();

Without Async Await.js

function start() {
  let x1 = exe(1);
  console.log("x1", x1);
  let x2 = exe(2);
  console.log("x2", x2);
}

function exe(n) {
  let response;

  setTimeout(() => {
    response = `Success ${n}`;
  }, 1000);

  return response;
}

start();