On Tue, 5 Jun 2001, Marcelo E. Magallon <[EMAIL PROTECTED]> wrote,
> Perhaps also noteworthy is the fact that things like '$foo{bar} eq ""'
> make the key 'bar' spring into existance in %foo. -w tells you about
> it.
You mean $foo{bar}{baz} eq "".
perl -wle 'my %foo; if ($foo{bar} eq "")
{print exists $foo{bar} ? 1 : 0}'
Use of uninitialized value at -e line 1.
0
perl -wle 'my %foo; if ($foo{bar}{baz} eq "")
{print exists $foo{bar} ? 1 : 0}'
Use of uninitialized value at -e line 1.
1
>From the article (by Uri Guttman) in,
http://tlc.perlarchive.com/articles/perl/ug0002.shtml
"...autovivification happens when Perl automatically create
a reference of the appropriate type when an undefined scalar
value is dereferenced."
I've been using it a lot of times without realizing it. I just learned
it myself.
s.a.n
--
Hasanuddin Tamir: [EMAIL PROTECTED] - Trabas: www.trabas.com
