Re: Setting variables, argumunts in defun

[wael-zwaiter]

Is the following valid?

(setq-local devi 0.18
            scal 1.0)

> Sent: Sunday, February 14, 2021 at 4:42 AM
> From: "Philip Kaludercic" <philipk@posteo.net>
> To: "Christopher Dimech" <dimech@gmx.com>
> Cc: wael-zwaiter@gmx.com, "Help Gnu Emacs" <help-gnu-emacs@gnu.org>
> Subject: Re: Setting variables, argumunts in defun
>
> Christopher Dimech <dimech@gmx.com> writes:
>
> > I am trying to use pcase on a string, but do need some direction
> > on how to use it.
>
> Pcase is usually used like this
>
>         (pcase objv
>           ("enable"
>            (setq devi 0.18)
>            (setq scal 0.2))
>           ("disable"
>            (setq devi 0.18)
>            (setq scal 1.0)))
>
> the first element it the expression that the execution depends on, and
> every possible branch starts with a case. What you are doing looks more
> like a cond-expression:
>
>         (cond ((string-equal objv "enable")
>                (setq devi 0.18)
>                (setq scal 0.2))
>               ((string-equal objv "disable")
>                (setq devi 0.18)
>                (setq scal 1.0)))
>
> That being said, it's probably better to use a symbol ('enable and
> 'disable) or a boolean value write this. Exploiting the fact that setq
> can assign multiple variables at one, you could also write
>
>         (if (eq objv 'enable)
>             (setq devi 0.18
>                   scal 0.2)
>           (setq devi 0.18
>                 scal 1.0))
>
> though depending on what you are doing, it might be better to avoid
> setting global variables in the first place.
>
> > (pcase (string-match "enable" objv)
> >       (
> >        (setq devi 0.18)
> >        (setq scal 0.2) )
> >
> >     ( (string-match "disable" objv)
> >      (setq devi 0.0)
> >      (setq scal 1.0) )
> >
> >     )
> >
> >
> >> Sent: Sunday, February 14, 2021 at 4:14 AM
> >> From: wael-zwaiter@gmx.com
> >> To: "Help Gnu Emacs" <help-gnu-emacs@gnu.org>
> >> Subject: Setting variables, argumunts in defun
> >>
> >> I would like to set up devi and scal by selecting either one or
> >> the other.  Wow can I do this in elisp.  Should I pass parameters
> >> to the function.  Can one pass a string, then check its contents?
> >>
> >> (defun deviscal ()
> >>
> >>   (setq devi 0.18)
> >>   (setq scal 0.2)
> >>
> >>   (setq devi 0.0)
> >>   (setq scal 1.0) )
> >>
> >>
> >>
> >>
> >>
> >
> >
>
> --
>       Philip K.
>