Nodejs Promise

# The return of the .then function will be the resolved value of the promise.
# tambahkan await sebelum initPromise jika mau menunggu proses
function initPromise() {
  return new Promise(function(res, rej) {
    res("initResolve")
  })
}

initPromise()
  .then(function(result) {
    console.log(result) // "initResolve"
    return "normalReturn"
  })
  .then(function(result) {
    console.log(result) // "normalReturn"
  })

# If the .then function returns a Promise, then the resolved value of that chained promise is passed to the following .then.
function initPromise() {
  return new Promise(function(res, rej) {
    res("initResolve")
  })
}

initPromise()
  .then(function(result) {
    console.log(result) // "initResolve"
    return new Promise(function(resolve, reject) {
       setTimeout(function() {
          resolve("secondPromise")
       }, 1000)
    })
  })
  .then(function(result) {
    console.log(result) // "secondPromise"
  })