Re: one key-press to comment out lines of code?

[Andreas Röhler]

On 30.04.2014 18:14, Sharon Kimble wrote:
> Whilst I'm still learning emacs and gnus I'm constantly adding code to my
> "setup-testbed.el" file, and then finding later that it doesn't do what its
> expected to do, or I don't like the outcome, so I then comment it
> out. Currently, I'm doing it laboriously by hand, but is it possible to
> highlight it and then with one key-press insert ";" in front of each and every
> line of the code please?
>
> I haven't seen this ability anywhere, but being able to do it would make
> things a whole lot easier for me, so, can it be done please folks?
>
> Sharon.

Maybe try

ar-comment-or-uncomment-lor

Comment line or region, unless it's already commented:
uncomment then.

and available here:

https://launchpad.net/s-x-emacs-werkstatt

ar-comment-lor.el

While this saves  keystrokes and thus using this daily, nonetheless, as for 
Emacs beginners recommend to stay with shipped code.
Also WRT to region comment-dwim is preferable - the region needs to be marked 
than anyway, there is not that saving.

Andreas