- (make-box [INITIAL [IMMUTABLE? #f]]) -> boxprocedure
Returns a BOX with, optional, initial value INITIAL.
The BOX is mutable unless the IMMUTABLE? argument is #t.
An attempt to mutate an immutable box will signal an exception.
Returns a BOX with, optional, initial value INITIAL.
The BOX is mutable unless the IMMUTABLE? argument is #t.
An attempt to mutate an immutable box will signal an exception.