// First promise returns an array after a delay

const getUsers = () => {

  return new Promise((resolve, reject) => {

    return setTimeout(

      () => resolve([{ id: 'ranjeet' }, { id: 'adil' }, { id: 'preet' }]),

      600

    )

  })

}

​

​

// Second promise relies on the result of first promise

const getIdFromUser = (user) => {

  return new Promise((resolve, reject) => {

    return setTimeout(() => resolve(user.id), 500)

  })

}

​

​

// Third promise relies on the result of the second promise

const capitalizeIds = (id) => {

  return new Promise((resolve, reject) => {

    return setTimeout(() => resolve(id.toUpperCase()), 200)

  })

}

​

const runAsyncFunctions = async () => {

  const users = await getUsers()

​

  Promise.all(

    users.map(async (user) => {

      const userId = await getIdFromUser(user)

      console.log(userId)

​

      const capitalizedId = await capitalizeIds(userId)

      console.log(capitalizedId)

    })

  )

​

  console.log(users)

}

​

runAsyncFunctions()