Re: Advantage using mapc over dolist

[Heime via Users list for the GNU Emacs text editor <help-gnu-emacs@gnu.org>]

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On Tuesday, December 3rd, 2024 at 6:51 AM, Tomas Hlavaty <tom@logand.com> wrote:

> On Mon 02 Dec 2024 at 17:03, Heime via Users list for the GNU Emacs text editor help-gnu-emacs@gnu.org wrote:
> 
> > Had thought the mapc would be faster.
> 
> 
> mapc calls a function (length list) times, so unless the compiler is
> clever enough to optimize this call away, it will be "slower"
> 
> however, if you want fast code, do not traverse lists whole and linearly
> in the first place. instead, try to place the loop as far outside as
> possible
> 
> > With dolist I can exit with (return) or catch-throw, can one do the
> > same with mapc?
> 
> 
> yes

How can I find an example of exiting prematurely from mapc?
 
> > For what cases is mapc useful?
> 
> 
> for side-effects, if you have the body of the loop as a function
> already

I see