From: Maxim Cournoyer <maxim.cournoyer@gmail.com>
To: zimoun <zimon.toutoune@gmail.com>
Cc: "Ludovic Courtès" <ludo@gnu.org>,
59164@debbugs.gnu.org, 58812@debbugs.gnu.org
Subject: [bug#58812] [bug#59164] Coding style: similarly-named variables
Date: Mon, 21 Nov 2022 15:55:46 -0500 [thread overview]
Message-ID: <87sficqb71.fsf@gmail.com> (raw)
In-Reply-To: <87zgckwdtw.fsf@gmail.com> (zimoun's message of "Mon, 21 Nov 2022 16:02:19 +0100")
Hi Simon,
zimoun <zimon.toutoune@gmail.com> writes:
> Hi Maxim,
>
> On Fri, 18 Nov 2022 at 12:02, Maxim Cournoyer <maxim.cournoyer@gmail.com> wrote:
>
>> The intent was to keep away from the following imperative style, which
>> hurts both readability and debuggability in my opinion:
>>
>> --8<---------------cut here---------------start------------->8---
>> (let* ((my-target "something")
>> (my-target (mutate-once my-target))
>> (my-target (mutate-twice my-target)))
>> (do-something-with my-target))
>> --8<---------------cut here---------------end--------------->8---
>
> Well, ’mutate-*’ is not really mutating. Maybe I miss something and
> from my understanding, this ’let*’reads,
>
> (let ((my-target "something"))
> (let ((my-target (mutate-once my-target)))
> (let ((my-target (mutate-twice my-target)))
> (do-something-with my-target))))
>
>
> and not,
>
> (begin
> (define my-target "something")
> (set! my-target (mutate-once my-target))
> (set! my-target (mutate-twice my-target))
> (do-something-with my-target))
Right. I used "mutated" where I should have used "shadowed by lexical
scoping". The outcome for me is the same; the original value of an
argument (target) in the code gets shadowed, thus is theory it becomes
more difficult to inspect its original value, should we have a debugger
that is able to stop at the place to inspect to print ',locals'.
In practice since using breakpoints/a debugger to debug Guile code
rarely works as intended (in my experience hacking on Guix!), we
typically sprinkle the source with 'pk', and that point becomes moot.
> Well, the former is ’lexical-scope’d so the 3 ’my-target’ are not truly
> an imperative style, I guess.
>
> Back to the pattern, you are suggesting to write,
>
> (let* ((my-target "something")
> (my-target* (mutate-once my-target))
> (my-target** (mutate-twice my-target*)))
> (do-something-with my-target**))
> well, I am not convinced it helps for readibility. And I think, the
> pattern is manually doing what ’let*’ is already doing for you.
The value it provides is that it becomes easy to inspect each
intermediary result in a debugger.
I think we're done expressing the arguments to have on both sides, which
aren't too strong either ways :-). I'm happy to restrain myself using
such a pattern and keep moving forward.
--
Thanks,
Maxim
next prev parent reply other threads:[~2022-11-21 20:56 UTC|newest]
Thread overview: 59+ messages / expand[flat|nested] mbox.gz Atom feed top
2022-10-27 3:41 [bug#58812] [PATCH 0/5] Add --symlink option to 'guix shell' Maxim Cournoyer
2022-10-27 3:50 ` [bug#58812] [PATCH 1/5] Makefile.am: Sort EXTRA_DIST entries Maxim Cournoyer
2022-10-27 3:50 ` [bug#58812] [PATCH 2/5] tests: Add a tests/utils.sh support file Maxim Cournoyer
2022-11-09 21:07 ` [bug#58812] [PATCH 0/5] Add --symlink option to 'guix shell' Ludovic Courtès
2022-11-10 3:38 ` Maxim Cournoyer
2022-11-10 4:23 ` [bug#59164] [PATCH v2 1/4] Makefile.am: Sort EXTRA_DIST entries Maxim Cournoyer
2022-11-10 4:23 ` [bug#59161] [PATCH v2 2/4] install: Validate symlink target in evaluate-populate-directive Maxim Cournoyer
2022-11-10 4:23 ` [bug#59162] [PATCH v2 3/4] guix: shell: Add '--symlink' option Maxim Cournoyer
2022-11-10 4:23 ` [bug#59163] [PATCH v2 4/4] shell: Detect --symlink spec problems early Maxim Cournoyer
2022-10-27 3:50 ` [bug#58812] [PATCH 3/5] install: Validate symlink target in evaluate-populate-directive Maxim Cournoyer
2022-11-09 21:06 ` [bug#58812] [PATCH 0/5] Add --symlink option to 'guix shell' Ludovic Courtès
2022-11-10 3:37 ` Maxim Cournoyer
2022-11-17 17:37 ` [bug#59164] Coding style: similarly-named variables Ludovic Courtès
2022-11-17 18:44 ` [bug#58812] " zimoun
2022-11-18 17:02 ` Maxim Cournoyer
2022-11-21 15:02 ` zimoun
2022-11-21 15:52 ` [bug#59164] " zimoun
2022-11-21 20:55 ` Maxim Cournoyer [this message]
2022-11-22 14:35 ` zimoun
2022-11-25 15:23 ` Guile debugger workgroup? (was: Coding style: similarly-named variables) Maxim Cournoyer
2022-11-26 11:22 ` Guile debugger workgroup? Ludovic Courtès
2022-11-27 3:16 ` Maxim Cournoyer
2022-11-28 10:53 ` Ludovic Courtès
2022-11-28 13:41 ` Attila Lendvai
2022-11-28 14:50 ` Maxim Cournoyer
2022-11-29 8:46 ` Ludovic Courtès
2022-11-30 3:44 ` Attila Lendvai
2022-11-27 12:04 ` zimoun
2022-11-28 0:27 ` Maxim Cournoyer
2022-11-28 11:06 ` Ludovic Courtès
2022-11-28 12:31 ` zimoun
2022-11-27 20:46 ` Attila Lendvai
2022-11-28 0:41 ` David Pirotte
2022-11-28 0:45 ` David Pirotte
2022-11-28 2:06 ` Maxim Cournoyer
2022-11-28 7:22 ` Joshua Branson
2022-11-28 11:09 ` Ludovic Courtès
2022-11-28 14:12 ` Attila Lendvai
2022-11-29 8:54 ` Ludovic Courtès
2022-11-28 12:24 ` Guile debugger workgroup? (was: Coding style: similarly-named variables) Csepp
2022-11-30 7:09 ` Guile debugger workgroup? Jannneke Nieuwenhuizen
2022-11-26 14:47 ` [bug#58812] [bug#59164] Coding style: similarly-named variables Ludovic Courtès
2022-11-17 20:34 ` Maxim Cournoyer
2022-11-20 10:46 ` [bug#58812] " Ludovic Courtès
2022-10-27 3:50 ` [bug#58812] [PATCH 4/5] guix: shell: Add '--symlink' option Maxim Cournoyer
2022-11-09 20:58 ` [bug#58812] [PATCH 0/5] Add --symlink option to 'guix shell' Ludovic Courtès
2022-11-10 3:10 ` Maxim Cournoyer
2022-11-10 14:17 ` Ludovic Courtès
2022-11-10 14:49 ` Maxim Cournoyer
2022-11-10 15:16 ` Maxim Cournoyer
2022-11-14 9:18 ` Ludovic Courtès
2022-11-10 16:05 ` [bug#58812] [PATCH v3 1/4] Makefile.am: Sort EXTRA_DIST entries Maxim Cournoyer
2022-11-10 16:05 ` [bug#58812] [PATCH v3 2/4] install: Validate symlink target in evaluate-populate-directive Maxim Cournoyer
2022-11-10 16:05 ` [bug#58812] [PATCH v3 3/4] guix: shell: Add '--symlink' option Maxim Cournoyer
2022-11-10 16:05 ` [bug#58812] [PATCH v3 4/4] shell: Detect --symlink spec problems early Maxim Cournoyer
2022-11-16 19:03 ` [bug#58812] [PATCH 0/5] Add --symlink option to 'guix shell' zimoun
2022-11-16 19:34 ` Maxim Cournoyer
2022-10-27 3:51 ` [bug#58812] [PATCH 5/5] shell: Detect --symlink spec problems early Maxim Cournoyer
2022-11-15 21:24 ` bug#58812: [PATCH v3 1/4] " Maxim Cournoyer
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