A highly extensible, declarative fizzbuzz with no hardcoded if statements, and no mutation.

fizzbuzz_without_conditionals.rb

applicators = {3 => "fizz", 5 => "buzz"}
fizzbuzz =
  (1..100).map do |n|
    fb = applicators.
           select{|a| n % a == 0}.
           values.join
    [n.to_s, fb].max # "1" > "" and "fizz" > "100000" since "1" < "a"
  end
puts fizzbuzz

Here is my attempt at the same thing. Self is a fizzbuzz module - I have a variety of solution attempts...

def self.no_conditionals
  fizzy = [1,0,0]
  buzzy = [1,0,0,0,0]

  1.upto(100) do |i|
    fizzy.rotate!
    buzzy.rotate!
    str = i.to_s * (1 - (fizzy[0] | buzzy[0]))
    str << "Fizz" * fizzy[0]
    str << "Buzz" * buzzy[0]
    puts str
  end
end