boundp
symbol => generalized-boolean
symbol--a symbol.
generalized-boolean--a generalized boolean.
Returns true if symbol is bound; otherwise, returns false.
(setq x 1) => 1 (boundp 'x) => true (makunbound 'x) => X (boundp 'x) => false (let ((x 2)) (boundp 'x)) => false (let ((x 2)) (declare (special x)) (boundp 'x)) => true
Should signal an error of type type-error if symbol is not a symbol.
The function bound determines only whether a symbol has a value in the global environment; any lexical bindings are ignored.