Async/Await ES7

async-await.js

async function process() {
  let name="john";
  if (name==="john") {
    return Promise.resolve("My name is john");
  } else {
    return Promise.reject("I am not john");
  }
}


async function start() {
  try {
    let response = await process(); // waiting for the promise
    console.log(response); // promise response
  } catch (error) { // will go here if you're not john
    console.error(error);
  }
}

start();

Check out the corresponding callback-hell example -
https://gist.github.com/warrenca/732f5dc4255e14978e5eabe30187616a or in babel