code: func NewClient(addr, prefix string) (Statter, error) {
  	sender, err := NewSimpleSender(addr)
  	if err != nil {
  		return nil, err
  	}
  
  	return &Client{prefix: prefix, sender: sender}, nil
  }
docs: // NewClient returns a pointer to a new Client, and an error.
  //
  // addr is a string of the format "hostname:port", and must be parsable by
  // net.ResolveUDPAddr.
  //
  // prefix is the statsd client prefix. Can be "" if no prefix is desired.