atom

atom Function

Syntax:

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))

Expanded Reference: atom

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(atom )