code: func (c *asyncClient) Exists(arg0 string) (result FutureBool, err Error) {
  	arg0bytes := []byte(arg0)
  
  	resp, err := c.conn.QueueRequest(&EXISTS, [][]byte{arg0bytes})
  	if err == nil {
  		result = resp.future.(FutureBool)
  	}
  	return result, err
  
  }
docs: /***
  // Redis SORT command.
  func (c *asyncClient) Sort (arg0 string) (result redis.Sort, err Error){
  	arg0bytes := []byte (arg0);
  
  	var resp *PendingResponse;
  	resp, err = c.conn.QueueRequest(&SORT, [][]byte{arg0bytes});
  	if err == nil {result = resp.GetMultiBulkData();}
  	return result, err;
  
  }
  ***/
  // Redis EXISTS command.