memq

Purpose
Search for item in list using eq as the comparison function.

Package   :gbbopen-tools

Module   :gbbopen-tools

Arguments and values

Returns
The tail of list beginning with item if item is present; nil otherwise.

Description
Memq is a convenient shorthand for:

  (member item (the list list) :test #'eq)

See also
    counted-delete
    assq
    delq
    delq-one

Examples

  > (memq 'b '(a b c b))
  (b c b)
  > (memq 'x '(a b c b))
  nil
  >

memq