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Why don't my tied hashes make the defined/exists distinction?

by faq_monk (Initiate)
on Oct 08, 1999 at 00:20 UTC ( #629=perlfaq nodetype: print w/ replies, xml ) Need Help??

Current Perl documentation can be found at perldoc.perl.org.

Here is our local, out-dated (pre-5.6) version:

They may or may not implement the EXISTS() and DEFINED() methods differently. For example, there isn't the concept of undef with hashes that are tied to DBM* files. This means the true/false tables above will give different results when used on such a hash. It also means that exists and defined do the same thing with a DBM* file, and what they end up doing is not what they do with ordinary hashes.

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