[REBOL] Re: Reverse select?
From: ale870:gm:ail at: 10-Aug-2007 22:09
I agree with you. It could be a good refinement a /reverse option!
On 8/10/07, Tim Johnson <tim-johnsons-web.com> wrote:
>
> On Wednesday 08 August 2007, Anton Rolls wrote:
> > SELECT does not have any refinement to control
> > search direction.
> >
> > You could do:
> >
> > select reverse copy states "Wyoming"
> >
> > But I don't recommend that because it's quite inefficient,
> > which would affect large datasets.
> A function (such as my 'before function)
> that uses:
>
> either found: find data key[pick data (index? found) - 1][none]
>
> Is easy enough to write and is probably acceptably efficient,
> but to implement it in the "C" code so that 'select would
> have a 'before refinement would be most useful...
> and speed up performance.
>
> MTCW
> Tim
>
> > Regards,
> >
> > Anton.
> >
> > > Hello,
> > >
> > > regarding the solution proposed by Gregg, I have a question:
> > > >> select reverse states "Wyoming"
> > >
> > > I think in such case the solution could be very slow, since Rebol
> > > reverses the data every time.
> > > Is it right?
> > >
> > > If so, is there any way to avoid the reverse process, but
> communicating
> > > to Rebol to search in back?
> > >
> > > Thank you!
>
> --
> To unsubscribe from the list, just send an email to
> lists at rebol.com with unsubscribe as the subject.
>
--
--Alessandro
