SPUG: interesting while() behavior and hosting recs
John W. Krahn
krahnj at telus.net
Thu Sep 30 23:59:49 CDT 2004
DeRykus, Charles E wrote:
> An array (AV) can meaningfully be evaluated in scalar context so
> I'd expect @empty to fail. However, () is a list in scalar context
As Randal has pointed out many times and as the FAQ clearly states:
perldoc -q "What is the difference between a list and an array"
[snip]
As a side note, there's no such thing as a list in scalar context.
> which doesn't behave in a predictable manner.
That is because it doesn't exist.
In the expression:
while () { ... }
there is NO list.
As a side note, and has been recently discused on comp.lang.perl.misc,
parentheses do not create a list.
http://groups.google.com/groups?threadm=UjE6d.138341%24D%25.46143%40attbi_s51
John
--
use Perl;
program
fulfillment
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