code: function dropDatabase(db, cmd, options, callback) {
    executeCommand(db, cmd, options, (err, result) => {
      // Did the user destroy the topology
      if (db.serverConfig && db.serverConfig.isDestroyed()) {
        return callback(new MongoError('topology was destroyed'));
      }
  
      if (callback == null) return;
      if (err) return handleCallback(callback, err, null);
      handleCallback(callback, null, result.ok ? true : false);
    });
  }
docs: Drop a database, removing it permanently from the server.
  
  @method
  @param {Db} db The Db instance to drop.
  @param {Object} cmd The command document.
  @param {Object} [options] Optional settings. See Db.prototype.dropDatabase for a list of options.
  @param {Db~resultCallback} [callback] The results callback