identity (ANSI and GNU Common Lisp Document)

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#### 5.3.37 identity [Function]

`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)