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identity (Function)

— Function: identity object object
Arguments and Values:

object—an object.


Returns its argument object.

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

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)