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

node_modules/async/internal/applyEach.js

@@ -0,0 +1,38 @@
+'use strict';
+
+Object.defineProperty(exports, "__esModule", {
+    value: true
+});
+exports.default = applyEach;
+
+var _slice = require('./slice');
+
+var _slice2 = _interopRequireDefault(_slice);
+
+var _initialParams = require('./initialParams');
+
+var _initialParams2 = _interopRequireDefault(_initialParams);
+
+var _wrapAsync = require('./wrapAsync');
+
+var _wrapAsync2 = _interopRequireDefault(_wrapAsync);
+
+function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }
+
+function applyEach(eachfn) {
+    return function (fns /*, ...args*/) {
+        var args = (0, _slice2.default)(arguments, 1);
+        var go = (0, _initialParams2.default)(function (args, callback) {
+            var that = this;
+            return eachfn(fns, function (fn, cb) {
+                (0, _wrapAsync2.default)(fn).apply(that, args.concat(cb));
+            }, callback);
+        });
+        if (args.length) {
+            return go.apply(this, args);
+        } else {
+            return go;
+        }
+    };
+}
+module.exports = exports['default'];