using-promise-es6-example-2.js

function printAfterTimeout(string, timeout){
  return new Promise((resolve, reject) => {
    setTimeout(function(){
      resolve(string);
    }, timeout);
  });
}

printAfterTimeout('Hello ', 2e3).then((result) => {
  console.log(result);
  return printAfterTimeout(result + 'Reader', 2e3);
}).then((result) => {
  console.log(result);
});
// Hello
// Hello Reader