identity

identity Function

Syntax:

identity object → object

Arguments and Values:

object—an object.

Description:

Returns its argument object.

Examples:

(identity 101) → 101 
(mapcan #’identity (list (list 1 2 3) ’(4 5 6))) → (1 2 3 4 5 6) 

Notes:

identity is intended for use with functions that require a function as an argument.

(eql x (identity x)) returns true for all possible values of x, but (eq x (identity x)) might return false when x is a number or character .

identity could be defined by

(defun identity (x) x)

Expanded Reference: identity

tip

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(identity )