SUM подправлено - 2

sum.js

@@ -1,10 +1,13 @@
-function sum() {
-	var agg = 0;
-	return function() {
-		agg = (arguments.length === 0)?(agg):(agg+arguments[0]);
-	return agg;};
-}
-//fn=sum();
-//fn(10);
-//fn(1);
-//fn();
+sum = (function sumFn() {
+    var agg = 0;
+
+    function innerAgg() {
+        agg = (arguments.length === 0) ? (agg) : (agg + arguments[0]);
+        return innerAgg;
+    };
+    innerAgg.valueOf = function() {
+        return agg;
+    };
+    return innerAgg;
+})()
+