function isGroupCollapsed(groupingValue) {
      var args = Array.prototype.slice.call(arguments);
      var arg0 = args[0];
      var level;
      var groupingKey;
      if (args.length === 1 && arg0.indexOf(groupingDelimiter) !== -1) {
        level = arg0.split(groupingDelimiter).length - 1;
        groupingKey = arg0;
      } else {
        level = args.length - 1;
        groupingKey = args.join(groupingDelimiter);
      }
      return toggledGroupsByLevel[level][groupingKey];
    }
/**
     * @param varArgs Either a Slick.Group's "groupingKey" property, or a
     *     variable argument list of grouping values denoting a unique path to the row.
     *     For example, calling isGroupCollapsed('high', '10%') will return whether the
     *     '10%' subgroup of the 'high' setGrouping is collapsed.
     */
@param varArgs Either a Slick.Group's "groupingKey" property, or a
variable argument list of grouping values denoting a unique path to the row.
@param varArgs Either a Slick . Group ' s " groupingKey " property or a variable argument list of grouping values denoting a unique path to the row .
function isGroupCollapsed(groupingValue) {
      var args = Array.prototype.slice.call(arguments);
      var arg0 = args[0];
      var level;
      var groupingKey;
      if (args.length === 1 && arg0.indexOf(groupingDelimiter) !== -1) {
        level = arg0.split(groupingDelimiter).length - 1;
        groupingKey = arg0;
      } else {
        level = args.length - 1;
        groupingKey = args.join(groupingDelimiter);
      }
      return toggledGroupsByLevel[level][groupingKey];
    }
function isGroupCollapsed ( groupingValue ) { var args = Array . prototype . slice . call ( arguments ) ; var arg0 = args [ 0 ] ; var level ; var groupingKey ; if ( args . length === 1 && arg0 . indexOf ( groupingDelimiter ) !== - 1 ) { level = arg0 . split ( groupingDelimiter ) . length - 1 ; groupingKey = arg0 ; } else { level = args . length - 1 ; groupingKey = args . join ( groupingDelimiter ) ; } return toggledGroupsByLevel [ level ] [ groupingKey ] ; }
@param varArgs Either a Slick.Group's "groupingKey" property, or a
     variable argument list of grouping values denoting a unique path to the row.
@param varArgs Either a Slick . Group ' s " groupingKey " property or a variable argument list of grouping values denoting a unique path to the row .