Example of Reject Promise

RejectPromise.js

var bar = new Promise(function (resolve) {
  setTimeout(function () { reject('error'); }, 50);
});

bar.then(function() {}, function (reject) { 
  console.log('reject:', reject); 
}); // reject:error

bar.catch(function (reject) { 
  console.log('catch:', reject); 
}); // catch:error