|There's more than one way to do things|
Oddly enough, the $wheel < 0 may be unnecessary
When I originally posted my suggestion, it was purely on the basis of reading the code snippet in the OP. In general, when doing this kind of iteration with a while loop, I check the range of the index before attempting to use it to access the array.
Only after discipulus refuted the idea, did I download the snippet and play with it and found that as posted, it "worked okay".
It took a little more investigation to understand that it gets away with it because of perl's propensity to accept negative array indices.
The funny thing is, that in one way, coding it "wrongly" has a benefit:
With the rise and rise of 'Social' network sites: 'Computers are making people easier to use everyday'
Examine what is said, not who speaks -- Silence betokens consent -- Love the truth but pardon error.
"Science is about questioning the status quo. Questioning authority".
In the absence of evidence, opinion is indistinguishable from prejudice.
In reply to Re^3: Untillian Headache or about the semantic of until