FizzBuzz to 100 in one line of (very compact) ruby. And other variants

fizzbuzz.rb

# How to use and experiment
# $ irb -I. -rfizzbuzz
# => fb = FizzBuzz.new
# => fb.enumerator_with_array_indices.take(30) == FizzBuzz.EXPECTATIONS
# => true

class FizzBuzz
  EXPECTATIONS=[1, 2, "Fizz", 4, "Buzz", "Fizz", 7, 8, "Fizz", "Buzz", 11, "Fizz", 13, 14, "FizzBuzz", 16, 17, "Fizz", 19, "Buzz", "Fizz", 22, 23, "Fizz", "Buzz", 26, "Fizz", 28, 29, "FizzBuzz"]

  def shortest # 100 chars of ruby
    Enumerator.new{|y|i=1;loop{y<<((s=[["Fizz"][i%3],["Buzz"][i%5]].compact.join).empty? ? i : s);i+=1}}
  end
  
  def enumerator_with_array_indices
    Enumerator.new do |y|
      i = 1
      loop do
        str = [["Fizz"][i%3],["Buzz"][i%5]].compact.join
        y << )str.empty? ? i : str)
        i += 1
      end
    end
  end
  
  def enumerator_with_cycles
    Enumerator.new do |y|
      i, fizz, buzz = 1, [nil,nil,"Fizz"].cycle, [nil,nil,nil,nil,"Buzz"].cycle
      loop do
        s = [fizz.next, buzz.next].compact.join
        y << (s.empty? ? i : s)
        i+=1
      end
    end
  end
  
  def enumerator_with_fetch
    Enumerator.new{|y|i=1;loop{y<<{0=>"FizzBuzz"}.fetch(i%15,{0=>"Fizz"}.fetch(i%3,{0=>"Buzz"}.fetch(i%5,i)));i+=1}}
  end
end