text: function isIsogram(word) {
  
    var entered = word;
    if (typeof (entered) === undefined || escape(entered).length === 0) {
      return false;
    }
  
    var passed = true;
  
    wordest = escape(entered).toLowerCase();
  
    var counts = {};
  
    for (var i = 0; i < wordest.length; i++) {
      var letter = wordest.toString().charAt(i);
  
      if (counts[letter]) {
        counts[letter] += 1;
      }
      else {
        counts[letter] = 1;
      }
  
      if (counts[letter] > 1) {
        return passed = false;
      }
    }
  
    return passed;
  };
  