diff --git a/sumAll/sumAll.js b/sumAll/sumAll.js
index 1429afa..11d224c 100644
--- a/sumAll/sumAll.js
+++ b/sumAll/sumAll.js
@@ -13,4 +13,22 @@ const sumAll = function(min, max) {
   return sum;
 };
 
+// A more advanced way using reduce method
+
+// const sumAll = function(min, max) {
+//   if(min < 0 || max < 0 || typeof min !== 'number'|| typeof max !== 'number' ) return 'ERROR';
+//   if(min > max){
+//     const temp = min;
+//     min = max;
+//     max = temp;
+//   }
+//   const arr = [];
+//   for(i= min; i <= max; i++){
+//     arr.push(i);
+//   }
+//   return arr.reduce((a, b) => a + b);
+// }
+
+
 module.exports = sumAll;
+