Promise.js

var successPromise = new Promise(function (resolve, reject) {
  setTimeout(resolve, 1000);
});

successPromise.then(function () { console.log('this should succeed') });

var failingPromise = new Promise(function (resolve, reject) {
  setTimeout(reject, 1000);
});

failingPromise.catch(function () { console.log('this should fail') });