From: Chris Shea <cmshea@...>
Date: 2008-04-23T11:55:04+09:00
Subject: Re: Extending Hast class with custom [] []= methods

On Apr 22, 7:31 pm, Chris Shea <cms...@gmail.com> wrote:
> On Apr 22, 6:15 pm, Daniel Finnie <d...@danfinnie.com> wrote:
>
> > Hi,
>
> > You can use super and/or alias:
>
> > class MyHash < Hash
> >   def [] key
> >     super(key.downcase)
> >   end
> > end
>
> But he asking for case-insensitivity.  If a key is created with
> uppercase letters, you're out of luck.  And if you look for a value
> for a non-string key, that's no good either:
>
> ###
> class MyHash < Hash
>   def [](key)
>     super(key.downcase)
>   end
> end
>
> h = MyHash.new
> h['A'] = 'never findable'
> h['A'] # => nil
> h[1]   # ~> undefined method `downcase' for 1:Fixnum (NoMethodError)
> ###
>
> You could override []= as well (and with more care), but I wonder if a
> different class with a Hash instance variable with mediated access
> would be a better route.
>
> Chris

Or just use Rubinius: http://pastie.textmate.org/185232

!!!
Chris