.js

setTimeout(() => {
  console.log("hello")
  setTimeout(() => {
    console.log("world")
  }, 1000)
}, 1000)

const setTimeoutPromise = function(text) {
  return new Promise((resolve) => {
    setTimeout(() => {
      console.log(text)
      resolve()
    }, 1000)
  })
}


setTimeoutPromise("hello")
.then(() => setTimeoutPromise("world"))
.then(() => setTimeoutPromise("1"))
.then(() => setTimeoutPromise("2"))
.then(() => setTimeoutPromise("3"))