Code Challenge Solution

large_hadron_concatenator.rb

DATA = {
  [47, 2, 3, 8] => '84732',
  [47, 40, 4] => '47440',
  [42, 40, 4] => '44240',
  [421, 42, 423] => '42423421',
  [47, 2, 3, 8, 47, 40, 4, 42, 40, 4, 421, 42, 423] => '84747444242423421404032'
}

def large_hadron_concatenator(data)
  data.sort { |a, b| "#{b}#{a}" <=> "#{a}#{b}" }.join
end

DATA.each do |key, value|
  puts large_hadron_concatenator(key) == value
end