newArc = function(d, withoutUpdate) {
      var updated;
      if (withoutUpdate) {
        return arc(d)
      } // for interpolate
      updated = $$.updateAngle(d);
      return updated ? arc(updated) : 'M 0 0'
    }
Get values of the data loaded in the chart.

@param {String|Array} targetId This API returns the value of specified target.
@param flat
@return {Array} Data values