//-------------------------------------
// async/await.
//-------------------------------------
const run = async (list) => {
  for (let i = 0; i < list.length; i++) {
    let result = await list[i]()
    if (result) { return true }
  } return false
}

//-------------------------------------
// promise only.
//-------------------------------------
const run = (ps, index) => {
  index = index || 0
  if (index === ps.length) return Promise.resolve(false)
  else return ps[index]().then(x => x ? true : run(ps, index + 1))
}