atom (ANSI and GNU Common Lisp Document)

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#### 14.2.7 atom [Function]

`atom` object ⇒ generalized-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))