* (unless ...) vs (when (not ...))
@ 2021-07-16 22:42 Hongyi Zhao
2021-07-16 23:12 ` Eric Abrahamsen
2021-07-17 17:52 ` Emanuel Berg via Users list for the GNU Emacs text editor
0 siblings, 2 replies; 3+ messages in thread
From: Hongyi Zhao @ 2021-07-16 22:42 UTC (permalink / raw)
To: help-gnu-emacs
Should I use (unless ...) or (when (not ...))? Which one is preferable?
Regards
--
Assoc. Prof. Hongyi Zhao <hongyi.zhao@gmail.com>
Theory and Simulation of Materials
Hebei Vocational University of Technology and Engineering
No. 473, Quannan West Street, Xindu District, Xingtai, Hebei province
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: (unless ...) vs (when (not ...))
2021-07-16 22:42 (unless ...) vs (when (not ...)) Hongyi Zhao
@ 2021-07-16 23:12 ` Eric Abrahamsen
2021-07-17 17:52 ` Emanuel Berg via Users list for the GNU Emacs text editor
1 sibling, 0 replies; 3+ messages in thread
From: Eric Abrahamsen @ 2021-07-16 23:12 UTC (permalink / raw)
To: Hongyi Zhao; +Cc: help-gnu-emacs
Hongyi Zhao <hongyi.zhao@gmail.com> writes:
> Should I use (unless ...) or (when (not ...))? Which one is preferable?
In terms of compilation, they both turn into `if' statements, so there's
no real difference there. Personally I find that, when I'm "reading" the
code out loud in my head, one approach will sound more natural than the
other, which can make things a little quicker to parse mentally. But it
really depends on what the condition is and how it's tested.
^ permalink raw reply [flat|nested] 3+ messages in thread
* Re: (unless ...) vs (when (not ...))
2021-07-16 22:42 (unless ...) vs (when (not ...)) Hongyi Zhao
2021-07-16 23:12 ` Eric Abrahamsen
@ 2021-07-17 17:52 ` Emanuel Berg via Users list for the GNU Emacs text editor
1 sibling, 0 replies; 3+ messages in thread
From: Emanuel Berg via Users list for the GNU Emacs text editor @ 2021-07-17 17:52 UTC (permalink / raw)
To: help-gnu-emacs
Hongyi Zhao wrote:
> Should I use (unless ...) or (when (not ...))? Which one
> is preferable?
`unless'
--
underground experts united
https://dataswamp.org/~incal
^ permalink raw reply [flat|nested] 3+ messages in thread
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2021-07-16 22:42 (unless ...) vs (when (not ...)) Hongyi Zhao
2021-07-16 23:12 ` Eric Abrahamsen
2021-07-17 17:52 ` Emanuel Berg via Users list for the GNU Emacs text editor
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