text: import { coordEach } from '../meta';
  import { point, checkIfOptionsExist } from '../helpers';
  
  /**
   * Takes one or more features and calculates the centroid using the mean of all vertices.
   * This lessens the effect of small islands and artifacts when calculating the centroid of a set of polygons.
   *
   * @name centroid
   * @param {GeoJSON} geojson GeoJSON to be centered
   * @param {Object} [options={}] Optional Parameters
   * @param {Object} [options.properties={}] an Object that is used as the {@link Feature}'s properties
   * @returns {Feature<Point>} the centroid of the input features
   * @example
   * var polygon = turf.polygon([[[-81, 41], [-88, 36], [-84, 31], [-80, 33], [-77, 39], [-81, 41]]]);
   *
   * var centroid = turf.centroid(polygon);
   *
   * //addToMap
   * var addToMap = [polygon, centroid]
   */
  function centroid(geojson, options) {
      options = checkIfOptionsExist(options);
      let xSum = 0;
      let ySum = 0;
      let len = 0;
      coordEach(geojson, function (coord) {
          xSum += coord[0];
          ySum += coord[1];
          len++;
      }, true);
      return point([xSum / len, ySum / len], options.properties);
  }
  
  export default centroid;
  