Fizzbuzz in Ruby.

fizzbuzz.rb

# not so insane
class Fixnum
  def fizzbuzz
    buffer = ''
    buffer += 'Fizz' if self % 3 == 0
    buffer += 'Buzz' if self % 5 == 0
    buffer.empty? ? self : buffer
  end
end

(1..100).each {|i| puts i.fizzbuzz }

# insane
1.upto 100 do |n|
  puts [[:fizz][n%3], [:buzz][n%5]].join[/.+/m] || n
end