[#18974] Perl/Python/Ruby common backend (Perl6) — ptkwt@...1.aracnet.com (Phil Tomson)

There is a thread about using .NET's CLR as a backend for Ruby, but how

17 messages 2001/08/01

[#19064] ANN: Code Amelioration Contest (presented by Ruby Conference 2001) — David Alan Black <dblack@...>

17 messages 2001/08/03
[#19184] Re: ANN: Code Amelioration Contest (presented by Ruby Conference 2001) — John Carter <john.carter@...> 2001/08/06

On Fri, 3 Aug 2001, David Alan Black wrote:

[#19185] Re: ANN: Code Amelioration Contest (presented by Ruby Conference 2001) — David Alan Black <dblack@...> 2001/08/06

Hello --

[#19186] Re: ANN: Code Amelioration Contest (presented by Ruby Conference 2001) — John Carter <john.carter@...> 2001/08/06

On Mon, 6 Aug 2001, David Alan Black wrote:

[#19125] My 1st look @ ruby: No prototypes and problem with String#gsub — stesch@... (Stefan Scholl)

My first ruby program:

23 messages 2001/08/04

[#19192] Some remarks from a nembie in Ruby — Renaud HEBERT <renaud.hebert@...>

After having read the book "Programming Ruby: The Pragmatic Programmer's

38 messages 2001/08/06

[#19269] Re: Perl/Python/Ruby common backend (Parrot, can Ruby play too?) — ptkwt@...1.aracnet.com (Phil Tomson)

In article <72X97.12093$9i1.972452@e420r-atl1.usenetserver.com>,

50 messages 2001/08/07
[#19349] Re: Perl/Python/Ruby common backend (Parrot, can Ruby play too?) — Mathieu Bouchard <matju@...> 2001/08/08

[#19456] Re: Perl/Python/Ruby common backend (Parrot, can Ruby play too?) — Harry Ohlsen <harryo@...> 2001/08/09

Ned Konz wrote:

[#19451] Re: Help! I'm still confused about threadin g in the ML — "Morris, Chris" <chris.morris@...>

> Is there an Outlook option to turn on In-Reply-To or References

14 messages 2001/08/09
[#19453] Re: Help! I'm still confused about threadin g in the ML — Dave Thomas <Dave@...> 2001/08/09

"Morris, Chris" <chris.morris@snelling.com> writes:

[#19506] the way class variables work — David Alan Black <dblack@...>

Hello --

51 messages 2001/08/10
[#19511] Re: the way class variables work — Chris Uzdavinis <chris@...> 2001/08/11

David Alan Black <dblack@candle.superlink.net> writes:

[#19524] order and freedom in Ruby (was: Re: Re: the way class variables work) — David Alan Black <dblack@...> 2001/08/11

Hello --

[#19517] Why not?: Assigning to self — furufuru@... (Ryo Furue)

Hi there,

55 messages 2001/08/11
[#19689] Re: Why not?: Assigning to self — Ron Jeffries <ronjeffries@...> 2001/08/14

On 13 Aug 2001 20:59:54 -0700, furufuru@ccsr.u-tokyo.ac.jp (Ryo Furue)

[#19694] Re: Why not?: Assigning to self — Ned Konz <ned@...> 2001/08/14

On Tuesday 14 August 2001 05:09 am, Ron Jeffries wrote:

[#19695] Re: Why not?: Assigning to self — ts <decoux@...> 2001/08/14

>>>>> "N" == Ned Konz <ned@bike-nomad.com> writes:

[#19696] Re: Why not?: Assigning to self — Ned Konz <ned@...> 2001/08/14

On Tuesday 14 August 2001 07:51 am, you wrote:

[#19697] Re: Why not?: Assigning to self — ts <decoux@...> 2001/08/14

>>>>> "N" == Ned Konz <ned@bike-nomad.com> writes:

[#19700] Re: Why not?: Assigning to self — Ned Konz <ned@...> 2001/08/14

On Tuesday 14 August 2001 08:27 am, you wrote:

[#19701] Re: Why not?: Assigning to self — ts <decoux@...> 2001/08/14

>>>>> "N" == Ned Konz <ned@bike-nomad.com> writes:

[#19703] Re: Why not?: Assigning to self — Ned Konz <ned@...> 2001/08/14

On Tuesday 14 August 2001 09:05 am, Guy Decoux wrote:

[#19704] Re: Why not?: Assigning to self — ts <decoux@...> 2001/08/14

>>>>> "N" == Ned Konz <ned@bike-nomad.com> writes:

[#19708] Re: Why not?: Assigning to self — Ned Konz <ned@...> 2001/08/14

On Tuesday 14 August 2001 09:27 am, you wrote:

[#19709] Re: Why not?: Assigning to self — ts <decoux@...> 2001/08/14

>>>>> "N" == Ned Konz <ned@bike-nomad.com> writes:

[#19713] Re: Why not?: Assigning to self — Ned Konz <ned@...> 2001/08/14

On Tuesday 14 August 2001 09:45 am, you wrote:

[#19750] Re: Why not?: Assigning to self — matz@... (Yukihiro Matsumoto) 2001/08/15

Hi,

[#19819] Re: Why not?: Assigning to self — Ned Konz <ned@...> 2001/08/15

On Tuesday 14 August 2001 08:14 pm, matz wrote:

[#19852] Re: Why not?: Assigning to self — matz@... (Yukihiro Matsumoto) 2001/08/16

Hi,

[#19857] Re: Why not?: Assigning to self — "Florian G. Pflug" <fgp@...> 2001/08/16

On Thu, Aug 16, 2001 at 11:05:59AM +0900, Yukihiro Matsumoto wrote:

[#19858] Re: Why not?: Assigning to self — matz@... (Yukihiro Matsumoto) 2001/08/16

Hi,

[#19867] Re: Why not?: Assigning to self — "Pit Capitain" <pit@...> 2001/08/16

Just a followup at (my) current end of the thread:

[#19550] Forced garbage collection — Lars Christensen <larsch@...>

14 messages 2001/08/11
[#19562] Re: Forced garbage collection — "Nat Pryce" <nat.pryce@...13media.com> 2001/08/12

From: "Lars Christensen" <larsch@cs.auc.dk>

[#19551] /.ed again — Tobias Reif <tobiasreif@...>

Ruy gets slasdotted again ;)

19 messages 2001/08/11

[#19650] Ruby Newbie mailing list — Michael Pence <mikepence@...>

Hello all.

14 messages 2001/08/13
[#19656] RE: Ruby Newbie mailing list — "Louis Brothers" <lcb134@...> 2001/08/13

We had a similar discussion on the OmniWeb Objective-C mailing list not to

[#19659] Re: Ruby Newbie mailing list — Michael Pence <mikepence@...> 2001/08/13

I appreciate your references to Objectionable-C ;-)

[#19685] Compiling Ruby with cygwin and Tk support — Manuel Zabelt <ng@...>

Hello!

13 messages 2001/08/14

[#19718] General (GUI/license) questions — Ryan Tarpine <rtarpine@...>

First: Kero commented in the description of his new Ruby Agenda program

18 messages 2001/08/14

[#19755] "new" returning nil: how to report the failure of object creation — furufuru@... (Ryo Furue)

Hi there,

14 messages 2001/08/15

[#19758] The GUI poll is in, and the results are surprising — Dave Thomas <Dave@...>

40 messages 2001/08/15
[#19774] Re: The GUI poll is in, and the results are surprising — Lars Christensen <larsch@...> 2001/08/15

On Wed, 15 Aug 2001, Dave Thomas wrote:

[#19784] Re: The GUI poll is in, and the results aresurprising — "Lyle Johnson" <ljohnson@...> 2001/08/15

> Please don't forget what Ruby is all about in this discussion! I think

[#19824] Ruby GUI — "Hal E. Fulton" <hal9000@...>

The concept of a new GUI is somewhat appealing,

16 messages 2001/08/15

[#20033] Ruby Article — Joshua Drake <jd.nospam@...>

Hello,

38 messages 2001/08/20

[#20127] Another Possible RCR - Wrappers via Mixins — Stephen White <spwhite@...>

The main difference between mix-ins and multiple inheritence is (to my understanding) that parent classes do not call child code, but mix-ins do.

15 messages 2001/08/22

[#20135] Bruce Eckel's criticism of Ruby — Ned Konz <ned@...>

Python.org links to http://www.mindview.net/Etc/notes.html#Ruby , saying

24 messages 2001/08/22

[#20183] ++ Operator — kamphausen@... (SKa)

Dear Community,

35 messages 2001/08/23
[#20234] Re: ++ Operator — Dave Thomas <Dave@...> 2001/08/24

matz@ruby-lang.org (Yukihiro Matsumoto) writes:

[#20236] Re: ++ Operator — matz@... (Yukihiro Matsumoto) 2001/08/24

Hi,

[#20209] In Ruby 0 is true but nil is false.. or how to shoot yourself?.. — Guillaume Cottenceau <gc@...>

I have a simple Audio-CD database (using CSV format). I was writing a

11 messages 2001/08/23

[#20254] File.readline(s) — Michael Husmann <michael.husmann@...>

I am reading a 55MB ASCII file by using File.readline(s) which takes on

14 messages 2001/08/24

[#20303] New Windows InstallShield version of Ruby — Andrew Hunt <andy@...>

19 messages 2001/08/24

[#20307] Backwards language — "Sean Middleditch" <elanthis@...>

Greetings,

30 messages 2001/08/24

[ruby-talk:19769] Re: "new" returning nil: how to report the failure of object creation

From: Ron Jeffries <ronjeffries@...>
Date: 2001-08-15 12:11:16 UTC
List: ruby-talk #19769
On 14 Aug 2001 20:47:24 -0700, furufuru@ccsr.u-tokyo.ac.jp (Ryo Furue)
wrote:

>Hi there,
>
>How do you report the failure of object creation, that is, if you find
>it impossible to properly initialize the object in the "initialize"
>method?  

I suspect it's generally a bad idea to write code where new can fail,
as using it is problematical.

However, if you must, consider returning an Error Object: an object of
a different class that will respond true to isError? (while
successfully-built objects of course return false).

The error object can optionally contain information about how things
went wrong.

Error Objects typically respond to no messages other than isError? and
some error-related methods that normal objects don't have, and maybe a
few print-related objects. They usually do not respond to the messages
that the real object would have.

That way, if I don't check for Error Objects, the next message I send
to it will fail.

A related technique is to return a Default Object that works but
doesn't do anything.

The core idea is called Null Object, and you can read lots about it at
http://c2.com/cgi/wiki?NullObject .

Ronald E Jeffries
http://www.XProgramming.com
http://www.objectmentor.com

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