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

node_modules/async/seq.js

@@ -0,0 +1,91 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.default = seq;
+
+var _noop = require('lodash/noop');
+
+var _noop2 = _interopRequireDefault(_noop);
+
+var _slice = require('./internal/slice');
+
+var _slice2 = _interopRequireDefault(_slice);
+
+var _reduce = require('./reduce');
+
+var _reduce2 = _interopRequireDefault(_reduce);
+
+var _wrapAsync = require('./internal/wrapAsync');
+
+var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
+
+var _arrayMap = require('lodash/_arrayMap');
+
+var _arrayMap2 = _interopRequireDefault(_arrayMap);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+/**
+ * Version of the compose function that is more natural to read. Each function
+ * consumes the return value of the previous function. It is the equivalent of
+ * [compose]{@link module:ControlFlow.compose} with the arguments reversed.
+ *
+ * Each function is executed with the `this` binding of the composed function.
+ *
+ * @name seq
+ * @static
+ * @memberOf module:ControlFlow
+ * @method
+ * @see [async.compose]{@link module:ControlFlow.compose}
+ * @category Control Flow
+ * @param {...AsyncFunction} functions - the asynchronous functions to compose
+ * @returns {Function} a function that composes the `functions` in order
+ * @example
+ *
+ * // Requires lodash (or underscore), express3 and dresende's orm2.
+ * // Part of an app, that fetches cats of the logged user.
+ * // This example uses `seq` function to avoid overnesting and error
+ * // handling clutter.
+ * app.get('/cats', function(request, response) {
+ *     var User = request.models.User;
+ *     async.seq(
+ *         _.bind(User.get, User),  // 'User.get' has signature (id, callback(err, data))
+ *         function(user, fn) {
+ *             user.getCats(fn);      // 'getCats' has signature (callback(err, data))
+ *         }
+ *     )(req.session.user_id, function (err, cats) {
+ *         if (err) {
+ *             console.error(err);
+ *             response.json({ status: 'error', message: err.message });
+ *         } else {
+ *             response.json({ status: 'ok', message: 'Cats found', data: cats });
+ *         }
+ *     });
+ * });
+ */
+function seq() /*...functions*/{
+    var _functions = (0, _arrayMap2.default)(arguments, _wrapAsync2.default);
+    return function () /*...args*/{
+        var args = (0, _slice2.default)(arguments);
+        var that = this;
+
+        var cb = args[args.length - 1];
+        if (typeof cb == 'function') {
+            args.pop();
+        } else {
+            cb = _noop2.default;
+        }
+
+        (0, _reduce2.default)(_functions, args, function (newargs, fn, cb) {
+            fn.apply(that, newargs.concat(function (err /*, ...nextargs*/) {
+                var nextargs = (0, _slice2.default)(arguments, 1);
+                cb(err, nextargs);
+            }));
+        }, function (err, results) {
+            cb.apply(that, [err].concat(results));
+        });
+    };
+}
+module.exports = exports['default'];