text: function isUnique(str){
      const uniqset = {};
      str = str.toLowerCase().replace(/\s/g, "");
      for (char of str) {
          if (uniqset[char]) return false;
          uniqset[char]=1;
      }
      return true;
  }
  
  let str = "holà";
  console.log(isUnique(str));
  
  