Thank you Harm and Aaron!
I tested your solutions;they both work and I think there are pretty clear!! But I think, next days I will try to explain what I'm doing.
Thanks a lot!!!
g.
On 2019-04-06 9:50 am, Thomas Morley wrote:
> Though, I'd think you should rethink whatever you plan, I'm very
> skeptic about always resetting a toplevel defined list.
> It's too destructive.
Also, it is convention to use an exclamation point as a suffix when
naming procedures that may modify the structure of arguments to produce
their results. This makes it easier for users to know where side
effects might exist.
Consider this:
%%%%
#(define (1+last! lst) (list-set! lst (- (length lst) 1) (1+ (last
lst))))
#(define foo '(1 2 3))
#(1+last! foo)
#(format #t "\nfoo = ~a" foo)
#(1+last! foo)
#(format #t "\nfoo = ~a" foo)
%%%%
-- Aaron Hill
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