Enumerator を使ったシンプルな FizzBuzz です。
fizzer = [nil, nil, 'Fizz'].cycle
buzzer = [nil, nil, nil, nil, 'Buzz'].cycle
1.upto(100) { |i|
fizz, buzz = fizzer.next, buzzer.next
puts fizz || buzz ? "#{fizz}#{buzz}" : i
}
Array#cycle がクールですね♥
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