"use strict";

let tags = ;

console.log(`Total items ${tags.size}`);
@@ -19,16 +19,92 @@
  tags = 
+new Set();%0A%0Atags.add(%22JavaScript%22);%0Atags.add(%22Programming%22);%0Atags.add(%22Web%22)
 ;%0A%0Aconso

Use Set and methods of Set