promises.6.js

Promise.race([
  new Promise((resolve, reject) => {
    setTimeout(function() {
      resolve('A');
    }, 500);
  }),
  new Promise((resolve, reject) => { 
    setTimeout(function(){
      resolve('B');
    }, 300);
  }),
  new Promise((resolve, reject) => {
    setTimeout(function(){
      resolve('C');
    }, 500);
  }),
  new Promise((resolve, reject) => {
    setTimeout(function() {
      resolve('D');
    }, 500);
  }),
  new Promise((resolve, reject) => {
    setTimeout(function(){ 
      resolve('E');
    }, 500);
  })
])
.then(result => {
  console.info(result);
})
.catch(reason => {
  console.warn('Failed: ', reason);
});