From: Yossef Mendelssohn <ymendel@...>
Date: 2010-11-04T04:34:11+09:00
Subject: Re: the dark side of inherited methods

On Nov 3, 3:20 am, Robert Klemme <shortcut...@googlemail.com> wrote:
>
> class Rectangle
>   attr_reader :width, :height
>
>   def initialize(width, height)
>     @width = width
>     @height = height
>   end
>
>   def outline
>     2 * ( width + height )
>   end
> end
>
> class Square < Rectangle
>
>   def initialize(x)
>     @width = x
>   end
>
>   def height; width; end
> end

>
> class Rectangle
>   def resize(width, height)
>     raise ArgumentError if width < 0 || height < 0
>     @width = width
>     @height = height
>     self
>   end
> end
>
> class Square
>   def resize(width, height)
>     raise ArgumentError if width < 0 || height < 0 || width != height
>     @width = width
>     self
>   end
> end

I find it interesting that you change a two-argument Rectangle
initialization method to take one argument in Square, but you keep the
resize method as two arguments.

--
-yossef