Re: Perl autovivifyies object property when using exists

> how I work around this?

perl -MData::Dump -E 'no autovivification;
                      my $fs4 = {_structure => {}};
                      exists $fs4->{_structure}{BLAH}{TEST}{Crap};
                      dd $fs4->{_structure};'
{}
[download]

map{substr$_->[0],$_->[1]||0,1}[\*||{},3],[[]],[ref qr-1,-,-1],[{}],[sub{}^*ARGV,3]

Comment on Re: Perl autovivifyies object property when using exists Select or Download Code

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Re^2: Perl autovivifyies object property when using exists by Danny (Chaplain) on Apr 03, 2024 at 19:56 UTC
Nice. I figured there was some pragma-like way to change this behavior, but never heard of "no autovivification".	[reply]
Re^3: Perl autovivifyies object property when using exists by LanX (Saint) on Apr 04, 2024 at 19:26 UTC
It's worth noting that the default behavior of `no autovivification` doesn't disable it in case of assignments aka `store` Which is great because that's DWIM for most. But surprising given the name of the pragma... `DB<5> no autovivification; $h->{a}{b}{c} = 42 DB<6> x $h 0 HASH(0xb400007e0b2fd8b8) 'a' => HASH(0xb400007e0b2ea7f8) 'b' => HASH(0xb400007e0b2eac30) 'c' => 42 DB<7>` [download] From the `autovivification` docs Possible unimports: `no autovivification qw<fetch store exists delete>;` But store is not default `no autovivification; # defaults to qw<fetch exists delete>` Cheers Rolf _{(addicted to the Perl Programming Language :) see Wikisyntax for the Monastery}	[reply] [d/l] [select]
Re^4: Perl autovivifyies object property when using exists by Danny (Chaplain) on Apr 04, 2024 at 21:50 UTC
Assignment "store" was the first thing I tested when I installed it yesterday :)	[reply]