PromiseChainGenerator.js

'use strict'



let promiseChain = () => {

  return new Promise(function(resolve, reject) {
    resolve(1);
  }).then((val) => {
    return new Promise(function(resolve, reject) {
      resolve(2);
    });
  })

}

promiseChain().then((val => {
  console.log(`Promise Map Output: ${val}`);
})).catch((err) => {
  console.log(`Error Output: ${err}`);
})