Array Ruby

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class Array2 < Array
  def [](index)
    if index>0
      super(index-1)
    else
      raise IndexError
    end
  end
  def []=(index,obj)
    if index>0
      super(index-1,obj)
    else
      raise IndexError
    end
  end
end
x = Array2.new
x[1]=5
x[2]=3
x[0]=1  # Error
x[-1]=1 # Error