The repeat for each only goes in forward sequential order starting at
the beginning, except for arrays where the order is indeterminate.
I have requested a sequential access enhancement to allow for
constructing this type of looping in a more flexible way (like
parallel instantiation, starting at an arbitrary point, and reverse
order), to make it possible to wander all over your data sequentially
with the speed of the repeat for each method. However, it would be
most useful with some improved string delimiter handling. Bugzilla #
2773
Having a reverse order repeat for each might be up to twice as slow
as the forward version depending on how it is implemented, because it
has to go backwards to the previous delimiter then forward to pick up
the data, though it could pick up the data in reverse order on the
way back. However, even twice as slow would be much faster than any
other method.
Dennis
On Jun 27, 2005, at 3:57 AM, Robert Brenstein wrote:
It sounds like you're looking for a feature that doesn't yet exist
(or at least I'm not aware of it). I could see having a property
that defines the direction in which the 'repeat for each'
structure does its looping, like this:
set the repeatDirection to "descending" -- or "down",
"reverse", ???
repeat for each element x in y
-- actions
end repeat
That would be a nice feature indeed. No harm in requesting it!
Phil Davis
I would prefer
repeat for each element x in y descending
but I doubt whether this would have the performance anywhere close
to ascending 'for each' so it is probably pointless to have it. As
far as I know, the speed of 'repeat for each' comes from processing
elements sequentially and thus without having to recalculate the
list pointer position.
Robert
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