- dict-update! DICT KEY DEF-VAL-PROCEDURE #!optional FUNCprocedure
Invokes FUNC on either the existing value for KEY in the DICT, or the result of the DEF-VAL-PROCEDURE when no existing value. The result then becomes the value for KEY in the DICT.
Returns the updated value for KEY in the DICT.
- FUNC
- (* -> *) ; identity
DEF-VAL-PROCEDURE must not return (void)!