optional multiple-return values in ruby

example.rb

# Starts out like this:
def parse_tld(url)
  # do some stuff, get top_level_domain
   return top_level_domain
end

# perfect
tld = parse_tld("example.gobushido.com") # gobushido.com

# ...
# Later, I *may* want both the tld and the subdomains
# 1.) I can change parse_tld to return a hash
#      {:tld => '...', :subdomain => '...'}
#     but I'll need to change all the invocations of parse_tld. 
#     Also, I generally don't need it, but I sometimes I might
# 2.) Return an array so we can do things like tld = parse_tld(url).first, or tld, subdomain = parse_tld(url)
#     But again, I'll have to change the invocations for some information I'll only need every now and then
# 3.) Create a separate function (which is the route I chose) that returns just the subdomain. But now I need two function calls to get the same information, and the logic is essentially the same.
# 2.) Alternative syntax, similar to first, last = [], except that
#     it only returns the first item if there's only one receiver:

def parse_tld(url)
  # do some stuff, get top_level_domain and url_subdomain
  multiple_return top_level_domain, url_subdomain
end

tld = parse_tld("example.gobushido.com") # gobushido.com
tld, subdomain = parse_tld("example.gobushido.com") # tld => gobushido.com, subdomain => example