code: function(qName) {
      if (!qName || qName.length === 0) {
        throw new Error('You must specify a queue name.');
      }
      var client = redis.client();
      return client.keysAsync('bull:' + qName + ':*').then(function(keys) {
        if (keys.length) {
          return client.del(keys);
        }
      });
    }
docs: Delete all data of a queue
  @param {String} qName Queue name
  @returns {Promise} A promise when all data of the queue is deleted