How to be lazy and shut your leg down

right_one.rb

class NotSoLazyGardener
  def apples
    @apples ||= []
  end

  def pears
    @pears ||= []
  end

  # Good luck in debugging this one
  def fruits
    @fruits = apples + pears
  end
end

sample.rb

lazy = LazyGardener.new
lazy.apples << 1
lazy.pears << 2
lazy.fruits  # => [1, 2]

lazy.apples << 3
lazy.fruits  # => [1, 2] # WTF?


lazy = NotSoLazyGardener.new
lazy.apples << 1
lazy.pears << 2
lazy.fruits  # => [1, 2]

lazy.apples << 3
lazy.fruits  # => [1, 2, 3] # yeah, right!

too_lazy.rb

class LazyGardener
  def apples
    @apples ||= []
  end

  def pears
    @pears ||= []
  end

  # Good luck in debugging this one
  def fruits
    @fruits ||= apples + pears
  end
end