Re: Elisp string function question

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

> What I want is
>
> (defun string-data-p (str)
>   (and (stringp str)
>        (not (string= str "")) ))
>
> Is it a string?
>
> Does it have data?

(string-data-p nil)                 ; nil
(string-data-p "")                  ; nil
(string-data-p "ready for takeoff") ; t

But that is actually much better! It is much clearer to ask if
something is ready than to ask if something isn't empty!

Now I can use `when' instead of `unless', or have it as the
first branch of `if's without an`not'!

Much better!

-- 
underground experts united
https://dataswamp.org/~incal