Izmjenjena struktura, dodan backand

web/node_modules/es5-ext/object/first-key.js

@@ -0,0 +1,13 @@
+"use strict";
+
+var value                   = require("./valid-value")
+  , objPropertyIsEnumerable = Object.prototype.propertyIsEnumerable;
+
+module.exports = function (obj) {
+	var i;
+	value(obj);
+	for (i in obj) {
+		if (objPropertyIsEnumerable.call(obj, i)) return i;
+	}
+	return null;
+};