text: /** @class */
  function BowlingAlley() {
  	this._lanes = 0;
  }
  
  /**
   * Add a lane to the bowling alley.
   * @also
   * Add the specified number of lanes to the bowling alley.
   * @param {number} [lanes=1] - The number of lanes to add.
   */
  BowlingAlley.prototype.addLanes = function addLanes(lanes) {
  	this._lanes += (typeof lanes === undefined) ? 1 : lanes;
  };
  