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

node_modules/async/selectLimit.js

@@ -0,0 +1,37 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+  value: true
+});
+
+var _filter = require('./internal/filter');
+
+var _filter2 = _interopRequireDefault(_filter);
+
+var _doParallelLimit = require('./internal/doParallelLimit');
+
+var _doParallelLimit2 = _interopRequireDefault(_doParallelLimit);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * The same as [`filter`]{@link module:Collections.filter} but runs a maximum of `limit` async operations at a
+ * time.
+ *
+ * @name filterLimit
+ * @static
+ * @memberOf module:Collections
+ * @method
+ * @see [async.filter]{@link module:Collections.filter}
+ * @alias selectLimit
+ * @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 {Function} iteratee - A truth test to apply to each item in `coll`.
+ * The `iteratee` is passed a `callback(err, truthValue)`, which must be called
+ * with a boolean argument once it has completed. Invoked with (item, callback).
+ * @param {Function} [callback] - A callback which is called after all the
+ * `iteratee` functions have finished. Invoked with (err, results).
+ */
+exports.default = (0, _doParallelLimit2.default)(_filter2.default);
+module.exports = exports['default'];