From: Joel VanderWerf <joelvanderwerf@...>
Date: 2010-11-03T03:25:20+09:00
Subject: Re: the dark side of inherited methods

On 11/02/2010 11:12 AM, James Edward Gray II wrote:
>    A = Struct.new(:x, :y, :z) do
>      def length
>        Math.sqrt(x**2 + y**2 + z**2)
>      end
>    end

How do you fix this?

A = Struct.new :x, :y, :z do
   def length
     Math.sqrt(x**2 + y**2 + z**2)
   end

   def x=(new_x)
     raise ArgumentError if new_x > 100
     super
   end
end

a = A.new
a.x = 1 # NoMethodError