asyncFor(each)

gistfile1.js

exports.asyncFor = function (start, end, eachCallback, endCallback) {
  var helper = function (i) {
    if (i >= end) {
      return process.nextTick(function () {endCallback();});
    }
    eachCallback(i);
    process.nextTick(function () {helper (i+1);});
  };

  return helper(start);
};

exports.asyncForEach = function (array, eachCallback, endCallback) {
  return exports.asyncFor(0, array.length,
    function (i) { eachCallback(array[i]); },
    function (i) { endCallback(); }
  );
};