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

node_modules/async/forEachOfLimit.js

@@ -0,0 +1,41 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+exports.default = eachOfLimit;
+
+var _eachOfLimit2 = require('./internal/eachOfLimit');
+
+var _eachOfLimit3 = _interopRequireDefault(_eachOfLimit2);
+
+var _wrapAsync = require('./internal/wrapAsync');
+
+var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * The same as [`eachOf`]{@link module:Collections.eachOf} but runs a maximum of `limit` async operations at a
+ * time.
+ *
+ * @name eachOfLimit
+ * @static
+ * @memberOf module:Collections
+ * @method
+ * @see [async.eachOf]{@link module:Collections.eachOf}
+ * @alias forEachOfLimit
+ * @category Collection
+ * @param {Array|Iterable|Object} coll - A collection to iterate over.
+ * @param {number} limit - The maximum number of async operations at a time.
+ * @param {AsyncFunction} iteratee - An async function to apply to each
+ * item in `coll`. The `key` is the item's key, or index in the case of an
+ * array.
+ * Invoked with (item, key, callback).
+ * @param {Function} [callback] - A callback which is called when all
+ * `iteratee` functions have finished, or an error occurs. Invoked with (err).
+ */
+function eachOfLimit(coll, limit, iteratee, callback) {
+  (0, _eachOfLimit3.default)(limit)(coll, (0, _wrapAsync2.default)(iteratee), callback);
+}
+module.exports = exports['default'];