async map example

gistfile1.txt

function asyncMap (list, doStuff, done) {
  var index = -1;
  var results = [];
  next();

  function next (error, result) {
    if (error) return done(error)
    if (index == list.length) return done(results);

    if (index >= 0) results[index] = result;
    doStuff(list[++index], next);
  };
};