get url and return content and save to file

function getContent(url, timeout, callback) {
  setTimeout(() => {
    callback('content')
  }, timeout)
}

function saveContent(content, callback) {
  setTimeout(() => {
    callback('content saved')
  }, 1000)
}

function log(result) {
  console.log(result)
}

getContent(url, timeout, (content) => {
  saveContent(content, (result) => {
    log(result)
  })
})