Re: prin1 / princ vs message ?

[Noam Postavsky <npostavs@users.sourceforge.net>]

On Sun, Jul 2, 2017 at 8:21 AM, Jean-Christophe Helary
<jean.christophe.helary@gmail.com> wrote:
>
> I am asking that because I am seeing code where standard-output is not set
> to anything but it's default (the echo area) and still prin1/princ are
> preferred over message. So, why would a developer chose prin1/princ over
> message when there is no stream argument (hence, when the output goes to
> standard output).

Using prin1/princ lets the caller let-bind standard-output to redirect
the output elsewhere, using message would not allow this.

Otherwise, I think the only practical difference is that prin1/princ
to the echo area doesn't support message coalescing, e.g.,
(progn (message "foo") (message "foo")) will show "foo [2 times]" in
*Messages*, whereas (progn (princ "foo") (princ "foo")) will show
"foofoo".