Extensible FizzBuzz implementation (based around string concatenation), written in Ruby.

extensible-fizzbuzz.rb

# Jack Hooper 2014

def fizzbuzz(n)
  output = ""
  output.concat("Fizz") if n.modulo(3).zero?
  output.concat("Buzz") if n.modulo(5).zero?
  return n if output.empty?
  output
end

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