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From: Jean Louis <bugs@gnu.support>
To: pietru@caramail.com
Cc: Help Gnu Emacs <help-gnu-emacs@gnu.org>
Subject: Re: Passing a list to an interactive function
Date: Sat, 19 Dec 2020 06:49:09 +0300	[thread overview]
Message-ID: <X914Nb4gHxGnD95c@protected.rcdrun.com> (raw)
In-Reply-To: <trinity-93bf562c-8a6b-4e7d-8921-df847935f634-1608348841972@3c-app-mailcom-bs02>

* pietru@caramail.com <pietru@caramail.com> [2020-12-19 06:34]:
> I decided towards a simpler strategy by passing a string with numbers
> separated by spaces.  But inside the function, I got to convert from
> string to a list containing numbers.
> 
> How  could I convert to a list containing numbers.
> 
> Example of string: "3 5 13"

Function `read-number' ensured you get the number. If function is for
you it is fine, if it is for others you risk not getting a number. If
data goes to database which also accepts string you risk losing
data as you maybe did not get a number.

If user writes spaces before numbers or after numbers or multiple
spaces between you need to remove such.

(setq my-worse-string "  1 2  3 4  5 6    ")

(setq my-string (split-string my-worse-string) ;; it will convert to numbers

my-string becomes => ("1" "2" "3" "4" "5" "6")

      Inspect `split-string' as it can omit nulls and trim
      strings automatically. But I did not here include those
      switches, as it does so by default.

Then you need to convert list of strings to list of numbers:
      
(mapcar #'string-to-number my-string)




  reply	other threads:[~2020-12-19  3:49 UTC|newest]

Thread overview: 15+ messages / expand[flat|nested]  mbox.gz  Atom feed  top
2020-12-18 11:05 Passing a list to an interactive function pietru
2020-12-18 11:30 ` Jean Louis
2020-12-18 11:38   ` pietru
2020-12-18 11:49     ` Joost Kremers
2020-12-18 11:50     ` tomas
2020-12-18 11:56     ` Jean Louis
2020-12-19  2:05     ` pietru
2020-12-19  3:25       ` Jean Louis
2020-12-19  3:34         ` pietru
2020-12-19  3:49           ` Jean Louis [this message]
2020-12-19  4:29             ` pietru
2020-12-19  5:54               ` Jean Louis
2020-12-19 11:03                 ` pietru
2020-12-19  6:23               ` Michael Heerdegen
2020-12-19  6:26                 ` pietru

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