ansaurus

Question

Answer 1

+4 A:

(set! a (list a b))
(set! b (car a))
(set! a (cadr a))

eljenso 2009-02-09 22:24:17

Answer 2

+20 A:

(rotatef a b)

ayrnieu 2009-02-10 01:28:27

Answer 3

A:

Also:

(let ((a b) (b a)) ...)

khedron 2009-07-09 00:33:49

That does not change the variables' values, it only creates new lexical bindings.

dmitry_vk 2009-07-09 05:47:21

@dmitry-vk: That's often all you need. It depends on what you're doing, of course.

khedron 2009-07-09 05:48:41

LISP variable exchange