Re: How do lisp gurus truncate?

[pjb@informatimago.com (Pascal J. Bourguignon)]

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)


-- 
__Pascal Bourguignon__