docs: function randomString() {
      var length = arguments.length > 0 && arguments[0] !== undefined ? arguments[0] : 8;
      var charset = arguments.length > 1 && arguments[1] !== undefined ? arguments[1] : 'abcdefghijklmnopqrstuvwxyz';
  
      var text = '';
      for (var i = 0; i < length; i++) {
          text += charset.charAt(Math.floor(Math.random() * charset.length));
      }return text;
  }