From: "Jesús Gabriel y Galán" <jgabrielygalan@...>
Date: 2008-04-16T06:40:28+09:00
Subject: Re: Hash or bidimensional Array when key is case insensitive

On Tue, Apr 15, 2008 at 11:27 PM, Iñaki Baz Castillo <ibc@aliax.net> wrote:
> El Martes, 15 de Abril de 2008, Stefan Rusterholz escribió:
>
> > Iñaki Baz Castillo wrote:
>  > > And if I use a Hash I'll do the same:
>  > >
>  > >   method = params_hash.find { |param| param[0] =~ /^method$/i }[1]
>  >
>  > Use a hash and lowercase the keys. If you need to preserve the original
>  > casing, do that in the value, e.g. like this: {key.lowercase => [key,
>  > value], ...}
>
>  Ah ok, it's a good idea :)

Hey, now I got your requirements !! Please ignore my other post...

>  > Another approach would be a special Key class which is like String but
>  > has #hash and #eql? redefined to work as if the String was lowercased.
>
>  Thanks but I don't understnad this point. Do you mean extending the Hash
>  class? I don't think so since there is not any Key class. Could you please
>  explain in more detail you suggestion?

What he means is that instead of lowercasing the key before inserting
in the hash, you create a Key class in a way that the hash will think
two keys are the same if they have the same string ignoring case.
Something like (not tested):

class Key
  attr_reader :key
  def initialize key
    @key = key
   end

  def hash
    @key.downcase.hash
  end

  def eql? other
    @key.downcase.eql? other.downcase
  end
end

and then you populate the hash as:

h[Key.new(method)] = [method, values_for_method]

this way you locate the entry in the hash ignoring case and have the
original value in the value of the hash.

Hope I've explained myself...

Jesus.