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From: Rob Pike <robpike@gmail.com>
To: Aharon Robbins <arnold@skeeve.com>
Cc: TUHS main list <tuhs@minnie.tuhs.org>
Subject: Re: [TUHS] The UNIX Command Language (1976)
Date: Wed, 2 Dec 2020 07:13:36 +1100	[thread overview]
Message-ID: <CAKzdPgwR7Y7W-pnY5AVkHOgdkSuCY1iGmqU8qh5BY1OtFajq7Q@mail.gmail.com> (raw)
In-Reply-To: <202012011639.0B1GdjcD031722@freefriends.org>

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Go lets you say "Loop: for ..." and then "break Loop".

-rob


On Wed, Dec 2, 2020 at 3:40 AM <arnold@skeeve.com> wrote:

> > On Tue, Dec 1, 2020 at 8:39 AM <arnold@skeeve.com> wrote:
> > > It was recognized that goto was not necessary if one had proper control
> > > structures in a language (if/else, while), and that code with no (or
> > > minimal) gotos was easier to read and understand.
>
> Warner Losh <imp@bsdimp.com> wrote:
> > This is true for simple flow control. However, when you had to break out
> of
> > multiple levels, or continue not the inner loop, but the middle loop, the
> > use of extra booleans sure made the code less understandable than a
> 'goto'
> > a label that stood in for that purpose... This was something that wasn't
> > well understood by language designers, and even today C and C++ neither
> > have good flow control beyond the basics. Even though both break and
> > continue could take an optional count without breaking old code....
>
> Quite true. Modern Bourne shells let you supply a number to break and
> continue to specify how many loops to break.  Ada, or maybe it was one of
> the Modula-X languages, let you put a label on a loop so that you could
> say `continue outer' or `break outer' and not need the booleans.
>
> This is something that newer languages (C#, Java, Go, ...) could have
> picked
> up but didn't, which I think is too bad.
>
> Arnold
>

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  reply	other threads:[~2020-12-01 20:15 UTC|newest]

Thread overview: 91+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-11-30  3:10 Joachim via TUHS
2020-11-30  8:30 ` Thomas Paulsen
2020-11-30 13:36 ` Brantley Coile
2020-11-30 15:12   ` Tom Ivar Helbekkmo via TUHS
2020-11-30 15:52 ` Clem Cole
2020-11-30 16:25   ` Dan Cross
2020-11-30 16:38     ` Warner Losh
2020-11-30 16:41       ` Dan Cross
2020-11-30 16:37   ` Larry McVoy
2020-11-30 16:54     ` Clem Cole
2020-11-30 18:13       ` Theodore Y. Ts'o
2020-11-30 18:25       ` John Cowan
2020-11-30 18:37         ` Clem Cole
2020-11-30 20:11           ` arnold
2020-11-30 21:49             ` Will Senn
2020-12-01  2:55             ` Jon Steinhart
2020-11-30 18:46         ` Nemo Nusquam
2021-02-10 20:48       ` [TUHS] troff was not so widely usable (was: The UNIX Command Language (1976)) Greg A. Woods
2021-02-10 21:44         ` Larry McVoy
2021-02-10 22:05         ` Clem Cole
2021-02-11 21:58           ` Greg A. Woods
2021-02-12  5:22             ` George Michaelson
2021-02-12 22:13             ` Dave Horsfall
2021-02-12 22:18               ` Ron Natalie
2021-02-10 22:36         ` Jon Steinhart
2021-02-10 23:05           ` George Michaelson
2021-02-11  0:27             ` Ron Natalie
2021-02-11  0:36               ` Larry McVoy
2021-02-11  1:53               ` Clem Cole
2021-02-11  1:59                 ` Richard Salz
2021-02-11  2:04                   ` George Michaelson
2021-02-11  2:44                     ` Richard Salz
2021-02-11  3:02                       ` Steve Nickolas
2021-02-11  4:07                         ` Toby Thain
2021-02-11 16:55                       ` Ron Natalie
2021-02-11 20:27                         ` John Cowan
2021-02-11  2:30                 ` [TUHS] troff was not so widely usable Mary Ann Horton
2021-02-11  2:52                   ` Larry McVoy
2021-02-11  6:42                     ` Andrew Hume
2021-02-11  7:12                       ` Rob Pike
2021-02-11 13:06                         ` John Gilmore
2021-02-11 17:34                           ` Jon Forrest
2021-02-11 18:09                             ` John Cowan
2021-02-11 18:43                               ` Rich Morin
2020-12-01  3:59 ` [TUHS] The UNIX Command Language (1976) jason-tuhs
2020-12-01  4:03   ` Jon Steinhart
2020-12-01  9:27   ` Steve Nickolas
2020-12-01 15:09   ` Jim Capp
2020-12-01 15:35     ` Toby Thain
2020-12-01 15:38     ` arnold
2020-12-01 16:24       ` Warner Losh
2020-12-01 16:39         ` arnold
2020-12-01 20:13           ` Rob Pike [this message]
2020-12-02  7:08             ` arnold
2020-12-02  7:29               ` Rob Pike
2020-12-01 20:20           ` Steffen Nurpmeso
2020-12-01 20:39             ` Bakul Shah
2020-12-01 21:24               ` Dan Cross
2020-12-01 23:44                 ` John Cowan
2020-12-12 19:50           ` scj
2020-12-01 16:47         ` Larry McVoy
2020-12-01 20:13     ` Dave Horsfall
2020-12-01 20:49       ` John Cowan
2020-12-01 16:04 ` Tyler Adams
     [not found] <CAMP=X_mO9oawUpHGOvgVtwVTgcmvdXAc5vrE_+s3d2NsH+1HgA@mail.gmail.com>
2020-12-01  0:00 ` Joachim via TUHS
2020-12-01  0:21   ` Dave Horsfall
2020-12-01  2:23     ` Larry McVoy
2020-12-01  3:13 Norman Wilson
2020-12-02  0:31 ` George Michaelson
2020-12-02  1:06   ` Adam Thornton
2020-12-02 17:02     ` John Cowan
     [not found] <CAKH6PiWA2uN4m0AGp7VRJTQ6XXDLJQweHoHjx2wN=zQYs1onpA@mail.gmail.com>
2020-12-03 20:31 ` M Douglas McIlroy
2020-12-03 20:37   ` Niklas Karlsson
2020-12-03 20:43     ` Larry McVoy
2020-12-03 20:56       ` Ralph Corderoy
2020-12-03 21:01       ` Ben Walton
2020-12-03 21:12       ` Clem Cole
2020-12-04  0:29       ` Dave Horsfall
2020-12-04  0:43         ` Rob Pike
2020-12-04  0:48           ` Larry McVoy
2020-12-04  1:25           ` Dan Cross
2020-12-04  9:27             ` arnold
2020-12-04 11:33               ` Andy Kosela
2020-12-04 13:14                 ` Tyler Adams
2020-12-04 13:17                   ` Niklas Karlsson
2020-12-04 13:22                     ` Tyler Adams
2020-12-04 13:25                       ` Niklas Karlsson
2020-12-04  0:45         ` George Michaelson
2020-12-04  1:10         ` Bakul Shah
2020-12-04  1:17           ` George Michaelson
2020-12-03 20:51     ` M Douglas McIlroy

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