code: function sortData(unorderedData) {
              let {data, dataZeroed} = unorderedData;
  
              if (orderingFunction) {
                  data.sort(orderingFunction);
                  dataZeroed.sort(orderingFunction)
              }
  
              return { data, dataZeroed };
          }
docs: Sorts data if orderingFunction is specified
  @param  {BarChartData}     clean unordered data
  @return  {BarChartData}    clean ordered data
  @private