fizzbuzzed.rb

# A
100.times do |i|
  case [i % 3 == 0, i % 5 == 0]
  when [true, true]  then puts 'Fizz Buzz'
  when [true, false] then puts 'Fizz'
  when [false, true] then puts 'Buzz'
  else
    puts i
  end
end

# B
FIZZBUZZ = {
  [true, true]  => 'Fizz Buzz',
  [true, false] => 'Fizz',
  [false, true] => 'Buzz'
}

100.times do |i|
  puts FIZZBUZZ[ [i % 3 == 0, i % 5 == 0] ] || i
end