added unit testing, and started implementing unit tests...phew

node_modules/async/internal/map.js

@@ -0,0 +1,35 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.default = _asyncMap;
+
+var _noop = require('lodash/noop');
+
+var _noop2 = _interopRequireDefault(_noop);
+
+var _wrapAsync = require('./wrapAsync');
+
+var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function _asyncMap(eachfn, arr, iteratee, callback) {
+    callback = callback || _noop2.default;
+    arr = arr || [];
+    var results = [];
+    var counter = 0;
+    var _iteratee = (0, _wrapAsync2.default)(iteratee);
+
+    eachfn(arr, function (value, _, callback) {
+        var index = counter++;
+        _iteratee(value, function (err, v) {
+            results[index] = v;
+            callback(err);
+        });
+    }, function (err) {
+        callback(err, results);
+    });
+}
+module.exports = exports['default'];