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| | defined - test whether a value, variable, or function is defined (Site not responding. Last check: 2007-11-03) |
 | | On the other hand, use of defined() upon aggregates (hashes and arrays) is not guaranteed to produce intuitive results, and should probably be avoided. |
 | | Using undef() on these, however, does clear their memory and then report them as not defined anymore, but you shouldn't do that unless you don't plan to use them again, because it saves time when you load them up again to have memory already ready to be filled. |
 | | This counterintuitive behavior of defined() on aggregates may be changed, fixed, or broken in a future release of Perl. |
| www.perl.com /doc/manual/html/pod/perlfunc/defined.html (571 words) |
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