JSFiddle - React, Tailwind, and code Playground

HTML

<body>
   <script>
      "use strict";
      console.log(length);
      console.log(length || 0);
      console.log(length);
      
      console.log(blah);
      console.log(blah || 0);
      console.log(blah);
   </script>
</body>