Method Ruby

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class RandomizingArray < Array
  def <<(e)
    insert(rand(size), e)
  end
  def [](i)
    super(rand(size))
  end
end
a = RandomizingArray.new
a << 1 << 2 << 3 << 4 << 5 << 6           # => [6, 3, 4, 5, 2, 1]
p a[0]
p a[0]
p a[0]
p
class RandomizingArray
  remove_method('[]')
end
a[0]                                      # => 6
a[0]                                      # => 6
a[0]                                      # => 6