addresses.rb

salutations = [['Mr.', 'Mrs.'], 'Mrs.', ['Mr.', 'Mrs.'], ['Dr.'], 'Ms.']
first_names = ['John', 'Jane', 'Sam', 'Louise', 'Kyle']
last_names = ['Dillinger', 'Cook', 'Livingston', 'Levinger', 'Merlotte']
addresses = ['33 Foolish Lane, Boston, MA 02210',
             '45 Cottage Way, Dartmouth, MA 02342',
             "54 Sally's Court, Bridgewater, MA 02324",
             '4534 Broadway, Boston, MA 02110',
             '4231 Cynthina Drive, Raynham, MA 02767']

mail_list = []
salutations.size.times do
  addr = {}
  salutation = salutations.pop
  if salutation.class == Array
    addr[:salutation] = salutation.join(' & ')
  else
    addr[:salutation] = salutation
  end
  addr[:first_name] = first_names.pop
  addr[:last_name] = last_names.pop
  addr[:address] = addresses.pop
  mail_list << addr
end

mail_list.reverse.each do |addr|
  full_address = ''
  addr.each_key do |k|
    full_address += "\n" if k == :address
    full_address += addr[k] + ' '
  end
  puts full_address + "\n\n"
end