100日後に死ぬインスタンス

100instance.rb

require 'date'
class Crocodile
  class DeadError < StandardError; end
  def initialize(born = Date.today)
    @born = born
  end

  def move
    if Date.today >= @born + 100
      raise DeadError
    else
      puts '🐊'
    end
  end
end