diff --git a/Practice/03_09/script.js b/Practice/03_09/script.js
index 1dd07f08..1a2ae3c3 100755
--- a/Practice/03_09/script.js
+++ b/Practice/03_09/script.js
@@ -23,4 +23,5 @@ const backpack = {
     this.strapLength.left = lengthLeft;
     this.strapLength.right = lengthRight;
   },
+  const keys = Object.keys(backpack);
 };