atom (Function)

Syntax:

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))