Might consider using _.map instead of arr.map

[mmiller42]

The original async library allows iterating over "collections" instead of just arrays, i.e. it also iterates over hasOwnProperties of objects. By using Lodash's map method, this could be supported with async-q with minimal code changes.

[kumavis]

just encountered this - would be nice to be able to use an iterator

i created a generator to iterate over more elements than could sanely be put into memory at once

[kumavis]

just checked, seems lodash.map does not handle iterators correctly https://github.com/lodash/lodash/issues/3780

[kumavis]

ok I realize that iterator support may be out of scope of just "collections" support, sorry to piggy back on this issue. For future github travelers, I solved it this way.

const PromisePool = require('es6-promise-pool')

async function eachLimit(iterator, asyncFn, concurrency) {
  const pool = new PromisePool(() => {
    const next = iterator.next()
    if (next.done) return null
    return asyncFn(next.value)
  }, concurrency)
  return pool.start()
}