Re: problem with mapconcat

[Stephen Berman]

On Thu, 04 Mar 2010 08:36:46 +0100 Andreas Röhler 
<andreas.roehler@easy-emacs.de> wrote:

> Thamer Mahmoud wrote:
>> Thamer Mahmoud <thamer.mahmoud@gmail.com> writes:
>>> Another alternative:
>>>
>>> (mapconcat 'string (string-to-list "abc") "/")
>>>
>>> => "a/b/c"
>> 
>> After sending the above, I realized that this would work too:
>> 
>> (mapconcat 'string "abc" "/")
>> 
>> 
>> 
>> 
>> 
>
> That seems to work either, whats strange for me:
>
> (mapconcat 'list "abc" "/")"a/b/c"

Maybe this helps clarify why that works:

(let (r)
  (dolist (e (string-to-list "abc") r)
    (setq r (concat r (if (null r) "" "/") (list e)))))

Steve Berman