Promises in javascript - simulation of data fetching request

promises-javascript.js

// SIMULATION OF A DATA FETCHING REQUEST WITH PROMISE

// Fulfilled Promise (data fetched successfully)
var promise1 = new Promise(function(resolve, reject) {
  setTimeout(function() {
    resolve("Promise resolved");
  }, 300);
  setTimeout(function() {
    reject("Promise Rejected");
  }, 500);
});

promise1.then(function(res) {
  console.log("Promise1: " + res);
});


// Rejected Promise (data fetched failed with error msg)
var promise2 = new Promise(function(resolve, reject) {
  setTimeout(function() {
    resolve("Promise resolved");
  }, 500);
  setTimeout(function() {
    reject("Promise Rejected");
  }, 300);
});

promise2.then(function(res) {
  console.log("Promise2: " + res);
}, function(err) {
  console.log("Promise2: " + err);
});