Use pop instead of shift

Author: tshemsedinov

Solutions/3-while.js

@@ -3,7 +3,7 @@
 const sum = (...args) => {
   let value = 0;
   while (args.length > 0) {
-    value += args.shift();
+    value += args.pop();
   }
   return value;
 };

Solutions/4-do-while.js

@@ -4,7 +4,7 @@ const sum = (...args) => {
   if (args.length === 0) return 0;
   let value = 0;
   do {
-    value += args.shift();
+    value += args.pop();
   } while (args.length > 0);
   return value;
 };