Paracetamol.js💊| #204: Explica este código JavaScript

const one = () => {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      reject("one")
    }, 5000)
  })
}

const two = () => {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      reject("two")
    }, 2000)
  })
}

const three = () => {
  return new Promise((resolve, reject) => {
    setTimeout(() => {
      reject("three")
    }, 10000)
  })
}

const res = () => {
  return Promise.all([one(), three(), two()])
}

res()
  .then(x => console.log(x))
  .catch(err => console.log(err))