Re: [External] : Re: Testing whether a list contains at least one non-nil element

[Michael Heerdegen]

<tomas@tuxteam.de> writes:

> If you are doing it "by hand", why not indulge in Lisp's
> "classic elegance", like so:
>
>   (defun has-non-nil (lst)
>     (cond
>      ((null lst) nil)
>      ((consp lst) (or (not (null (car lst))) (has-non-nil (cdr lst))))
>      (t (error "Not a proper list! You cheater!"))))

You don't want to implement such functions in Emacs with recursion
because you'll easily hit `max-lisp-eval-depth' when they are called.
Sorry to tell you, but a loop is the preferable way in Elisp.

Michael.