CLHS: Function CONSP

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Function CONSP

Syntax:

consp object => generalized-boolean

Arguments and Values:

object---an object.

generalized-boolean---a generalized boolean.

Description:

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

Examples:

     (consp nil) =>  false
     (consp (cons 1 2)) =>  true

The empty list is not a cons, so

     (consp '()) ==  (consp 'nil) =>  false

Side Effects: None.

Affected By: None.

Exceptional Situations: None.

See Also:

listp

Notes:

     (consp object) ==  (typep object 'cons) ==  (not (typep object 'atom)) ==  (typep object '(not atom))

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