(member item list)

Identify the first occurrence of an item in the list.

This function identifies the first occurrence of an item in a list. A list is returned, beginning with the first occurrence of the item and containing any items following it. This is useful if you need to make a change to a particular item in the list, but you aren't sure exactly where the item is.

Examples

	Code	Returns
(setq a '(1 2 3 4 3 2 1))	(1 2 3 4 3 2 1)
(member 3 a)	(3 4 3 2 1)
(- (length a) (length (member 3 a)))	2

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(length list)

(list expression …)

(setq symbol1 statement1 [symbol2 statement2] ...)

LISP Compatibility

Programming Overview of LISP (LISt Processing) Language