Conditional String?

conditional_string.rb

#!/usr/bin/env ruby
# I've encountered this pattern in every language I've used:
#
# 1. Given a list of items.
# 2. I want to convert this list to a string.
# 3. Where the items are separated by a comma.
# 4. The last item should not end with a comma.
#
# This is what I'm using, but I feel there's a better way:

hosts = ['taco', 'burrito']

host_list = ''

unless hosts.size == 1
  host_list << "#{hosts.pop}:80, "
end

host_list << "#{hosts.pop}:80"

puts host_list
# Will print: taco:80, burrito:80

The solution: hosts.join(':80, ') + ':80'. Thanks all!