docs: function (point, i) {
              var series = point.series,
                args = arguments,
                fn = typeof i === 'number' ?
                    // Insert the value in the given position
                  function (key) {
                      var val = key === 'y' && series.toYData ? series.toYData(point) : point[key];
                      series[key + 'Data'][i] = val;
                  } :
                    // Apply the method specified in i with the following arguments as arguments
                  function (key) {
                      Array.prototype[i].apply(series[key + 'Data'], Array.prototype.slice.call(args, 2));
                  };
  
              each(series.parallelArrays, fn);
          }