From: Gavin Kistner <gavin@...>
Date: 2005-06-03T07:48:45+09:00
Subject: Re: Implementing a Read-Only array

On Jun 2, 2005, at 11:22 AM, Brian Schr�der wrote:
> Just playing devils advocate here, but if you care about user added
> methods, the user may also add something that acts in effekt like
>
> class Array
>   def mutate(i, v)
>     self[i] = v
>   end
> end

Duly noted and understood.

However...if I've undef'd #[]=, then that won't work, right?


irb(main):003:0> class Array; def mutate(i,v); self[i]=v; end; end

irb(main):004:0> a = []

irb(main):005:0> class << a; undef_method( :'[]=' ); end

irb(main):008:0> a[0] = 0
NoMethodError: undefined method `[]=' for []:Array
         from (irb):8

irb(main):009:0> a.mutate(0,0)
NoMethodError: undefined method `[]=' for []:Array
         from (irb):2:in `mutate'
         from (irb):9