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)