Is this a bug in Perl (nested hash)?

C. Abney cabney at cyberpass.net
Wed Apr 12 01:11:04 CDT 2000


~sdpm~
On Tue, 11 Apr 2000, John R. Comeau wrote:

> Checking for the existence of a nested key like $hash{key0}{key00}
> causes $hash{key0} to exist.  Is that the way it's supposed to work?
> I would think that merely checking for the existence of
> $hash{key0}{key00} would not cause $hash{key0} to exist.

The short answer is "use exists()."  The long answer is FTCFMTE. :-)

It has something to do though, I suspect, with how autovivification is
done by perl.

perldoc perlfaq4, perldoc perlfunc

CA
-- 
Einstein himself said that God doesn't roll dice. But he was wrong. And
in fact, anyone who has played role-playing games knows that God
probably had to roll quite a few dice to come up with a character like
Einstein.  -- Larry Wall                                     C. Abney

~sdpm~

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