From: Robert Klemme <bob.news@...>
Date: 2004-05-21T06:28:47+09:00
Subject: Re: Overriding "", [], and {}


"why the lucky stiff" <ruby-talk@whytheluckystiff.net> schrieb im
Newsbeitrag news:40AD161F.6070107@whytheluckystiff.net...
> Bill Atkins wrote:
>
> >Is there any way to cause "", [], and {} to have different behaviors.
> >I'd like to be able to have {} create OrderedHash's instead of Hash's,
> >but I don't know how to change this behavior.  If I do Hash =
> >OrderedHash, then Hash.new will create an OrderedHash, but {} still
> >gives me an old-fashioned hash.
> >
> >
> This isn't what you're looking for, but I think it's the best answer.
> Both Array and Hash have a builtin [] class method, which can be used to
> define new Arrays or Hashes.
>
>   >> a = Array['goats', 'coats', 'asymptotes']
>   => ["goats", "coats", "asymptotes"]
>   >> h = Hash['g' => 'goats', 'c' => 'coats']
>   => {"c"=>"coats", "g"=>"goats"}
>
> You can use the same class method to get away with really clean
> definitions of new Array/Hash derivatives.  For example, YAML has an
> Omap (ordered hash) class:
>
>   >> o = YAML::Omap['c', 'coats', 'g', 'goats']
>   => [["c", "coats"], ["g", "goats"]]
>   >> o.class
>   => YAML::Omap
>
> _why

or how about

oh = OrderedHash.new.update( {
  "foo" => "bar",
  "bar2 => "foo",
} )

    robert