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[REBOL] Re: Maplist?

From: tim:johnsons-web at: 8-Sep-2001 14:23

On Sat, Sep 08, 2001 at 04:54:46PM -0400, David Ness wrote:
> I've look thru the documentation, but haven't had the answer to a very > simple question jump out at me yet. > > Question: > What converts ["123" "45667"] to [123 45667]
That's one question: here's one way to do it: ndx: 1 loop length? test[change at test ndx to-integer test/:ndx ndx: ndx + 1] == 3 ; the loop returns the final value of ndx
>> test ; let's look at test
== [123 45667] ;NOTE: 'test was changed
> or generalizing: > How do I generate the block that is the result of applying some > function to each element of an existing block (the classical > Lisp `Maplist') function;
This is a different case, if I understand your question. A second block would be created, and one would want to test the type of each member of the source block ; you might have something like this: dst: make block! length? test ; save memory reallocation internally ndx: 1 loop length? test[append dst to-integer test/:ndx ndx: ndx + 1]
>> test
== ["123" "4567"] ; is not changed
>> dst
== [123 4567] ; new block as a result
> perhaps more importantly, > what documentation should I look at that would point me in the > direction to solutions to this class of problems...
If I've understood you here, the core user's manual goes into series if great depth with charts and everything. PS: I wish I know more about lisp, I think a knowledge of lisp would add to the rebol "literature". Perhaps you're the one? HTH Tim
> -- > To unsubscribe from this list, please send an email to > [rebol-request--rebol--com] with "unsubscribe" in the > subject, without the quotes.
-- Tim Johnson <[tim--johnsons-web--com]>