JSFiddle - React, Tailwind, and code Playground

by Aleksandr Tomashov

HTML

<pre>
  <code>
    function isIsogram(str){
      let str2 = str.toUpperCase().split('');
      str2 = str2.filter( tokken => str2.indexOf(tokken) == str2.lastIndexOf(tokken))
      return str2.length == str.length
    }

    isIsogram("Dermatoglyphics") == true
    isIsogram("aba") == false
    isIsogram("moOse") == false 
  </code>
</pre>