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14.2.7 atom [Function]

atom objectgeneralized-boolean

Arguments and Values::

object—an object.

generalized-boolean—a generalized boolean.

Description::

Returns true if object is of type atom; otherwise, returns false.

Examples::
      (atom 'sss) ⇒  true
      (atom (cons 1 2)) ⇒  false
      (atom nil) ⇒  true
      (atom '()) ⇒  true
      (atom 3) ⇒  true
Notes::
      (atom object) == (typep object 'atom) == (not (consp object))
      == (not (typep object 'cons)) == (typep object '(not cons))