Newbie: references in elisp

Newbie: references in elisp

[Pawel]

Hallo group members!
I want my function return one than one element. I C I do it using references. Is there something like reference in elisp? .. or maybe I should use lists with some additional trick?

regards
Pawel

Re: Newbie: references in elisp

[Andreas Roehler]

Pawel wrote:

> Hallo group members!
> I want my function return one than one element. I C I do it
> using references. Is there something like reference in elisp?
> .. or maybe I should use lists with some additional trick?
> 
> regards
> Pawel

;; Just one possibility:

(setq my-list '("a" "b" "c"))

(car my-list) => "a"

(defun one-by-one (my-list) 
  "This is an example"
  (let ((many my-list))
  (while many
    (insert (car many))
    (setq many (cdr many)))))

(one-by-one my-list) => abc

__
Andreas Roehler

Re: Newbie: references in elisp

[Andreas Roehler]

Pawel wrote:

> Hallo group members!
> I want my function return one than one element. I C I do it
> using references. Is there something like reference in elisp?
> .. or maybe I should use lists with some additional trick?
> 
> regards
> Pawel

;; Just one possibility:

(setq my-list '("a" "b" "c"))

(car my-list) => "a"

(defun one-by-one (my-list) 
  "This is an example"
  (let ((many my-list))
  (while many
    (insert (car many))
    (setq many (cdr many)))))

(one-by-one my-list) => abc

__
Andreas Roehler

Re: Newbie: references in elisp

[Harold Lee]

On Jan 23, 9:12 am, Pawel <n...@wp.pl> wrote:
> Hallo group members!
> I want my function return one than one element. I C I do it using references. Is there something like reference in elisp? .. or maybe I should use lists with some additional trick?

I guess you mean returning more than one value? Try
MULTIPLE-VALUE-BIND, taken from Common Lisp:

http://www.lisp.org/HyperSpec/Body/mac_multiple-value-bind.html

Thus you can define a function that returns multiple values:

(defun f () (values 1 2))

And get at the values like this:

(multiple-value-bind (a b)
    (f)
  (format "a is %d and b is %d" a b))