Dar,
I don't agree with this. Commas are significant items. The -1 is supposed to be the same as saying the last. If I replace the -1 with a 10, then it decides that the last comma is significant. If I had a 10 comma empty list in "it" and if I were to:
repeat 10 times; get item 1 to -1 of it; end repeat
I would have nothing left. But:
repeat 10 times; get item 1 to 100 of it; end repeat
would preserve all the commas.
Removing a comma destroys part of the list structure. Just because it is empty now does not mean it will not have some data later. A single item line has no comma. A comma goes between items as you said. A single line has no return. Returns go between lines. But you are right in that if I ask Rev how many items are on the lines, it says:
6,5,6
And that is why the -1 get translated into a 5 instead of a 6.
IMHO this is not a good compromise. I don't like this at all! It can lead to all sorts of subtle bugs. If this is the way it is supposed to be, then it needs a significant amount of tutorial documentation to keep programmers from getting tripped up.
Dennis
On May 13, 2005, at 10:00 PM, Dar Scott wrote:
On May 13, 2005, at 7:08 PM, Dennis Brown wrote:
Notice the missing last comma on the second line. It does not matter how many commas I append, it will always leave off the last one unless there is another character at the end. Unless I do not understand how this is supposed to work, this is a bug. Yes?
I believe the way it works is correct.
It accommodates the best compromise in being able to represent both an empty list and a list of one item that is empty.
If comma is between, then those look the same. You can't represent both. If the comma is after, then you can represent both.
Now a comma in between is just fine for lists that do not have any empty items. In that case, the empty string means the empty list. So, for non-empty items, the traditional list is fine.
If items can be empty, then it would be better to represent lists with the comma at the end of each item. In both cases the number of items and item representation works.
The same applies to lines. I think that is easier to accept. For items, it is harder; a comma should go between things.
Dar Scott
-- ********************************************** DSC (Dar Scott Consulting & Dar's Lab) http://www.swcp.com/dsc/ Programming and software **********************************************
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