secret_santa.rb

secret_santa.rb

people = ARGV
possible_receivers = people.dup
result = {}

people.each do |p|
  # a person doesn't have to give a gift to himself;
  tmp = possible_receivers.dup
  tmp.delete(p)

  receiver = tmp.sample
  # a person doesn't receive a gift from the person he's given a gift to;
  while result[receiver].nil? == false && result[receiver] == p do
    receiver = tmp.sample
  end

  result[p] = receiver
  possible_receivers.delete(receiver)
end

puts result