CLHS: Function FUNCTIONP

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Function FUNCTIONP

Syntax:

functionp object => generalized-boolean

Arguments and Values:

object---an object.

generalized-boolean---a generalized boolean.

Description:

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

Examples:

     (functionp 'append) =>  false
     (functionp #'append) =>  true
     (functionp (symbol-function 'append)) =>  true
     (flet ((f () 1)) (functionp #'f)) =>  true
     (functionp (compile nil '(lambda () 259))) =>  true
     (functionp nil) =>  false
     (functionp 12) =>  false
     (functionp '(lambda (x) (* x x))) =>  false
     (functionp #'(lambda (x) (* x x))) =>  true

Side Effects: None.

Affected By: None.

Exceptional Situations: None.

See Also: None.

Notes:

     (functionp object) ==  (typep object 'function)

The following X3J13 cleanup issue, not part of the specification, applies to this section:

- FUNCTION-TYPE:X3J13-MARCH-88

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