From: "David A. Black" <dblack@...>
Date: 2008-08-30T05:16:20+09:00
Subject: Re: Immutable Ruby

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Hi --

On Sat, 30 Aug 2008, Trans wrote:

>
>
> On Aug 29, 12:18=A0am, Yukihiro Matsumoto <m...@ruby-lang.org> wrote:
>> Hi,
>>
>> In message "Re: Immutable Ruby"
>> =A0 =A0 on Fri, 29 Aug 2008 10:19:15 +0900, Trans <transf...@gmail.com> =
writes:
>>
>> |I was thinking about Erlang a bit today, the fact that it's objects
>> |are all immutable and it's usefulness to concurrency. So I began to
>> |wonder, what would an Immutable Ruby look like?
>>
>> I have once dreamed of a such language, and had a conclusion that was
>> not Ruby at least, although a pretty interesting language.
>
> Does that mean you think Immutable Ruby would be so different a
> language as to no longer be recognizable as Ruby? Perhaps so. The
> prospect is very interesting to me nonetheless. If I did not have to
> worry so much about $$$$, I would very much like to try my hand at
> writing an Immutable Ruby in Erlang.

I don't think it would be recognizable as Ruby. Consider this:

$ ./ruby -ve 'a =3D Object.new; class << a;
    def talk; print "hi\n"; end;
    end; a.talk'
ruby - version 1.0-971225 (i686-linux)
hi

If you change print to puts, it won't know what you mean. And don't
ask a for its .methods either. In other words, per-object differential
behavior was part of Ruby before puts and methods were. I'd say it's
pretty fundamental :-)

(If anyone wants my hacked copy of Ruby 1.0 (hacked to compile on gcc
4.0, for some definitions of "compile"), let me know.)


David

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