Re: member returns list

[Michael Heerdegen]

Emanuel Berg <embe8573@student.uu.se> writes:

> Or is it something else?

The `car' of the result of `member' is the actual element you were
searching.  Since `member' tests with `equal', that can be a different
object.  So it can be useful to have access to it.

But `member' returns a whole sublist.  This gives you also a simple mean
to modify a list, like in this example:

(let ((list '(1 2 3 4 5)))
  (let ((list1 (member 3 list)))
    (when list1 (setcar list1 -3))
    list))

   ==> (1 2 -3 4 5)


Michael.