(boundp item)

Determine whether an item has a value.

The boundp function determines if item has a corresponding value bound to it. If item does have a value bound to it, LISP returns T. If not, or if item is bound to nil, a nil is returned.

 

Examples

Code Returns
(setq x nil y 7)  
(boundp 'x) nil
(boundp 'y) T
(boundp 'z) nil

 

NOTE The boundp function is the opposite of the null function.

 

Tell me about...

(atom item)

(atoms-family format [symbol1 symbol2 ...])

(numberp item)

(setq symbol1 statement1 [symbol2 statement2] ...)

(type item)

LISP Compatibility

Programming Overview of LISP (LISt Processing) Language

 

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