code: func (c *Client) Join(channel string) {
  	channel = strings.ToLower(channel)
  
  	// If we don't have the channel in our map AND we have an
  	// active connection, explicitly join before we add it to our map
  	c.channelsMtx.Lock()
  	if !c.channels[channel] && c.connActive.get() {
  		go c.send(fmt.Sprintf("JOIN #%s", channel))
  	}
  
  	c.channels[channel] = true
  	c.channelUserlistMutex.Lock()
  	c.channelUserlist[channel] = map[string]bool{}
  	c.channelUserlistMutex.Unlock()
  	c.channelsMtx.Unlock()
  }
docs: // Join enter a twitch channel to read more messages