JavaScript promise sample

jspromisses.js

let promise = new Promise((resolve, reject) => {
  //invoke async operation, then 
  if (/* success */) { 
      resolve("response received! Success!"); 
  } else { 
      reject(Error("Something failed")); 
  } 
});

promise.then(function(result) { 
  console.log(result); // "response received! Success!" 
}, function(err) {
  console.log(err); // Error: "Something failed" 
});