identity

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ANSI Common Lisp 5 Data and Control Flow 5.3 Dictionary of Data and Control Flow

5.3.37 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)

Allegro CL Implementation Details:

None.

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