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Re: Rosetta: Babbage problem

From Andrew Haley <andrew29@littlepinkcloud.invalid>
Subject Re: Rosetta: Babbage problem
Newsgroups comp.lang.forth
References (1 earlier) <ab981ee5-550e-4be0-ad5d-39471ce05e2e@googlegroups.com> <87mvall6l5.fsf@nightsong.com> <799db5cd-cad1-4fd3-999d-e0effce1fd80@googlegroups.com> <864lwtb38n.fsf@molnjunk.nocrew.org> <87pofhb0qq.fsf@nightsong.com>
Message-ID <RaSdnbjAAfWGj47EnZ2dnUU7-VWdnZ2d@supernews.com> (permalink)
Date 2017-05-10 08:14 -0500

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Paul Rubin <no.email@nospam.invalid> wrote:
> Lars Brinkhoff <lars.spam@nocrew.org> writes:
>> I believe Thinking Forth advises to not pass around boolean flags
> 
> Oh that's interesting, I hadn't known about that.  But don't all the
> usual comparison words like < return flags?  I wonder what the problem
> is.

The idea is that once you know X, you act on it.  And you refactor as
needed to make that possible.  It doesn't always work and it's not a
perfect heuristic, but it's useful to try it if you find yourself
saying IF more than once on the same condition.  Errors are a classic
case, where every word ends up returning a flag, and every caller ends
up testing it.

Andrew.

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Thread

Rosetta: Babbage problem "Robert L." <No_spamming@noWhere_7073.org> - 2017-05-09 08:29 +0000
  Re: Rosetta: Babbage problem mhx@iae.nl - 2017-05-09 12:58 -0700
    Re: Rosetta: Babbage problem Paul Rubin <no.email@nospam.invalid> - 2017-05-09 20:43 -0700
      Re: Rosetta: Babbage problem Julian Fondren <julian.fondren@gmail.com> - 2017-05-09 23:43 -0700
        Re: Rosetta: Babbage problem Lars Brinkhoff <lars.spam@nocrew.org> - 2017-05-10 09:06 +0200
          Re: Rosetta: Babbage problem Julian Fondren <julian.fondren@gmail.com> - 2017-05-10 00:27 -0700
            Re: Rosetta: Babbage problem Lars Brinkhoff <lars.spam@nocrew.org> - 2017-05-10 09:32 +0200
          Re: Rosetta: Babbage problem Paul Rubin <no.email@nospam.invalid> - 2017-05-10 00:59 -0700
            Re: Rosetta: Babbage problem Andrew Haley <andrew29@littlepinkcloud.invalid> - 2017-05-10 08:14 -0500
      Re: Rosetta: Babbage problem mhx@iae.nl - 2017-05-10 02:59 -0700
        Re: Rosetta: Babbage problem Bruno Gauthier <bgauthier@free.fr> - 2017-05-15 12:25 +0200
          Re: Rosetta: Babbage problem mhx@iae.nl - 2017-05-15 04:17 -0700
            Re: Rosetta: Babbage problem Bruno Gauthier <bgauthier@free.fr> - 2017-05-15 13:48 +0200
              Re: Rosetta: Babbage problem Julian Fondren <julian.fondren@gmail.com> - 2017-05-15 04:56 -0700
                Re: Rosetta: Babbage problem Bruno Gauthier <bgauthier@free.fr> - 2017-05-15 16:33 +0200
              Re: Rosetta: Babbage problem mhx@iae.nl - 2017-05-15 10:53 -0700
              Re: Rosetta: Babbage problem albert@cherry.spenarnc.xs4all.nl (Albert van der Horst) - 2017-05-15 21:39 +0200
  Re: Rosetta: Babbage problem "Robert L." <No_spamming@noWhere_7073.org> - 2017-05-18 09:23 +0000
    Re: Rosetta: Babbage problem "Robert L." <No_spamming@noWhere_7073.org> - 2017-05-18 09:29 +0000

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