Messin with Method Missin

Ruh roh, check this snippet inspired by Metaprogramming Ruby:

class DungeonDice
  def method_missing(method, *args)
    puts 'roll dat die yo'

    5.times do
      number = rand(6) + 1
      puts "spin...spin...spin...#{number}"
    end

    puts "landed on...#{number}"
  end
end

dice_roll = DungeonDice.new
puts dice_roll.yugioh

Nice juicy stack level too deep (SystemStackError). What’s happenin?

Since number is defined within the block, it is out of scope once the last puts statement tries to reference it. Ruby interprets number to then be a method call on self, and since DungeonDice does not have a method called number, it calls method_missing! Dice ROLL!