At 12:10 AM +0100 4/15/06, Mark O'Neill wrote:
Now, aside from the obvious that DownTo is in reverse order are
there any gains in using DownTo?
DownTo also allows you to avoid repeatedly calculating the loop
termination point.
for i = 0 to UBound(MyArray)
Calculates UBound EVERY time through the loop
for i = UBound(MyArray) DownTo 0
Only calculates UBound prior to the first iteration through the loop
Now UBound isn't particularly expensive, so it might not matter much.
However the benchmark example from earlier today had an expensive
termination condition and so calculating it on every loop iteration
made a BIG difference in overall speed. In that case you might choose
to use DownTo, or just calculate the termination condition once and
cache it.
dim z as integer = ExpensiveMethod()
for i as integer = 0 to z
Next
Regards,
Joe Huber
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