Re: How do lisp gurus truncate?

[Giorgos Keramidas <keramida@ceid.upatras.gr>]

On Thu, 23 Jul 2009 19:31:29 +0200, pjb@informatimago.com (Pascal J. Bourguignon) wrote:
>Giorgos Keramidas <keramida@ceid.upatras.gr> writes:
>> My only concern about find/nthcdr is that if the list can get very very
>> long, you are essentially going to iterate over it twice.  But I am not
>> sure if there's a function like `find' that will return the cons cell
>> instead of the value at position N.
>
> Too bad you discarded member earlier...  In Common Lisp it takes a
> :test argument like find and other functions.  In emacs, a variant
> named member* provides the same feature:
>
> (require 'cl)
> (member* 3 '(1.5 2.5 3.5 4.5 5.5) :test (function <)) --> (3.5 4.5 5.5)

Thank you!  I should have look a bit better at the member docs :)