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✏️ async-map.js

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/*
usage:

// do something to a list of things
asyncMap(myListOfStuff, function (thing, cb) { doSomething(thing.foo, cb) }, cb)
// do more than one thing to each item
asyncMap(list, fooFn, barFn, cb)

module.exports = asyncMap

function asyncMap () {
  var steps = Array.prototype.slice.call(arguments)
    , list = steps.shift() || []
    , cb_ = steps.pop()
  if (typeof cb_ !== "function") throw new Error(
    "No callback provided to asyncMap")
  if (!list) return cb_(null, [])
  if (!Array.isArray(list)) list = [list]
  var n = steps.length
    , data = [] // 2d array
    , errState = null
    , l = list.length
    , a = l * n
  if (!a) return cb_(null, [])
  function cb (er) {
    if (er && !errState) errState = er

var argLen = arguments.length
    for (var i = 1; i < argLen; i ++) if (arguments[i] !== undefined) {
      data[i - 1] = (data[i - 1] || []).concat(arguments[i])
    }
    // see if any new things have been added.
    if (list.length > l) {
      var newList = list.slice(l)
      a += (list.length - l) * n
      l = list.length
      process.nextTick(function () {
        newList.forEach(function (ar) {
          steps.forEach(function (fn) { fn(ar, cb) })
        })
      })
    }

if (--a === 0) cb_.apply(null, [errState].concat(data))
  }
  // expect the supplied cb function to be called
  // "n" times for each thing in the array.
  list.forEach(function (ar) {
    steps.forEach(function (fn) { fn(ar, cb) })
  })
}

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✏️ async-map.js