diff --git a/hamming.js b/hamming.js
index 7c7ea3b..1b9d2e0 100644
--- a/hamming.js
+++ b/hamming.js
@@ -1,17 +1,11 @@
-//
-// This is only a SKELETON file for the 'Hamming' exercise. It's been provided as a
-// convenience to get you started writing code faster.
-// Make sure to look at test.script.js--that should give you some hints about what is
-// expected here.
-
-'use strict';
-
 function Hamming() {};
-
 Hamming.prototype.compute = function (strand1, strand2) {
-//
-// YOUR CODE GOES HERE
-//
-};
+var diff = 0;
+for (i = 0; i <strand1.length; i++) {
+  if(strand1[i] != strand2[i]) {
+diff = diff + 7;
+  }
+ }
+return diff;
 
-module.exports = Hamming;
+};