On Oct 17, 2007, at 6:28 PM, Paul McNett wrote:
> I guess what gets me about VFP arrays is that there isn't such a thing
> as an empty one. When you initialize an array, it comes with a single
> element, initialized to .F. So when you go to populate it, you have to
> have special code to either not redimension it for the first
> element, or
> to remove the bogus extra element after you are done populating.
>
> Other than that, an array index is fundamentally an offset from the
> beginning. 0-based preserves that relationship, so that the first
> element has no offset, the second element is offset by 1, etc.
>
> Do you commonly find yourself writing code like:
>
> alen(aTemp, 1) - 1
>
> ? If so, that indicates that 0-based would be better.
Actually, "zero-based" doesn't mean that it can have zero elements;
it only means that you reference the first element by 0 instead of 1.
All Python sequences can be empty.
The index of a sequence (list, tuple, array) is thought of as either
the absolute position of the element, or the offset from the
beginning. The former is 1-based, since the first position is #1, the
second is #2, etc.; the latter is 0-based, since the first position
is at the beginning and thus not offset (offset=0), the second
element is offset by 1 from the beginning, etc.
-- Ed Leafe
-- http://leafe.com
-- http://dabodev.com
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