FUTX_desafio1_resposta.js

function serial(obj, i, farr) {
  if (i === farr.length) {
    console.log(obj)
  } else {
    farr[i](obj, e => {
      serial(e, i + 1, farr)
    })
  }
}

function paralelo (obj, farr) {
  let i = 0
  const output = {obj0: obj}
  farr.forEach(e => {
    e(obj, ee => {
      output[e.name] = ee
      i++
      if (i === farr.length) {
        console.log(output)
      }
    })
  })
}