From: Eric Hodel <drbrain@...7.net>
Date: 2003-12-15T15:12:25-08:00
Subject: Re: [Nuby] Object ID Lookup?

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Jim Moy (web@jimmoy.com) wrote:

> Hi all, a Ruby Nuby here with a question.
>=20
> Is there a way to lookup an object reference from the object's id?=20
> Something to do like the following, but without the need for the lookup
> hash:
>=20
>   a =3D { "a" =3D> 1, "b" =3D> 2 }
>   b =3D { "c" =3D> 4, "d" =3D> 3 }
>   arr =3D [a, b]
>   ids =3D arr.collect {|h| h.id}
>   lookup =3D {}
>   arr.each { |h| lookup[h.id] =3D h }
>   cmp =3D ids.collect {|id| lookup[id]}
>   ids =3D=3D cmp =3D> true
>=20
> In my instance, I've got a reference set of hashes that I'm pointing to
> from multiple arrays.  Those arrays are manipulated depending on sorting
> and other factors.
>=20
> I don't want to get Hash#=3D=3D involved so I'm using the Hash object id'=
s.=20
> After processing is completed, I'd like to get back from the IDs to the
> object references.  The lookup is working, but I was wondering if there
> was a better method.

Not seeing the internals of your code, will Object#equal? (identical
object ids) be able to replace #=3D=3D?

--=20
Eric Hodel - drbrain@segment7.net - http://segment7.net
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