Promise.all() sample

promise_all.js

var sum = 0
var p1 = new Promise((resolve, reject) => {
  console.log('p1')
  sum = sum + 1
  setTimeout(resolve, 1000, 'one')
})
var p2 = new Promise((resolve, reject) => {
  console.log('p2')
  sum = sum + 1
  setTimeout(reject, 2000, 'two')
})
var p3 = new Promise((resolve, reject) => {
  console.log('p3')
  sum = sum + 1
  setTimeout(resolve, 3000, 'three')
})
var p4 = new Promise((resolve, reject) => {
  console.log('p4')
  sum = sum + 1
  setTimeout((resolve), 4000, 'four')
})
var p5 = new Promise((resolve, reject) => {
  console.log('p5')
  sum = sum + 1
  setTimeout(reject, 5000, 'four')
})

Promise.all([p1, p2, p3, p4, p5])
.then(values => {
  console.log(values)
  console.log('sum :', sum)
}).catch(reason => {
  console.log('error', reason)
})