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10.2.17 boundp [Function]

boundp symbol => generalized-boolean

Arguments and Values::

symbol—a symbol.

generalized-boolean—a generalized boolean.

Description::

Returns true if symbol is bound; otherwise, returns false.

Examples::
      (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
Exceptional Situations::

Should signal an error of type type-error if symbol is not a symbol.

See Also::

set , setq , symbol-value , makunbound

Notes::

The function bound determines only whether a symbol has a value in the global environment; any lexical bindings are ignored.