Sequential Promise execution

sequential-promise-execution-test.js

// StackOverFlow: http://stackoverflow.com/a/30823708/1248952

function getTimer(name, timeout) {
  return () => new Promise((resolve, reject) => {
    setTimeout(() => {
      console.log(name);
      resolve();
    }, timeout);
  });
}
let p1 = getTimer('p1', 200);
let p2 = getTimer('p2', 10);
let p3 = getTimer('p3', 50);

[p1, p2, p3].reduce((p, fn) => p.then(fn), Promise.resolve()).then(() => {
  console.log('end');
});