diff --git a/1-js/06-advanced-functions/09-call-apply-decorators/article.md b/1-js/06-advanced-functions/09-call-apply-decorators/article.md
index 6fc33f17f8..e344998b12 100644
--- a/1-js/06-advanced-functions/09-call-apply-decorators/article.md
+++ b/1-js/06-advanced-functions/09-call-apply-decorators/article.md
@@ -274,7 +274,7 @@ function cachingDecorator(func, hash) {
 }
 
 function hash(args) {
-  return args[0] + ',' + args[1];
+  return Array.from(args).join(',');
 }
 
 worker.slow = cachingDecorator(worker.slow, hash);