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Here's a little snip I put together messing around with autovivification. Perhaps some monks that feel queasy about this topic may find it useful.

For a more in depth tutorial on the topic The Bad, the Ugly, and the Good of autovivification may be of interest. Cheers :)

use strict; use warnings; use Test::More qw(no_plan); use Data::Dumper; my %hash = (a => 'a', b => 'b'); ok( ! exists($hash{c}), "hash -- c doesn't exist"); ok( ! exists($hash{c}), "hash -- c still doesn't exist"); ok( ! defined($hash{c}), "hash -- c not defined either"); my $hashref = { %hash }; ok( ! exists($hashref->{c}), "hashref -- c doesn't exist"); ok( ! exists($hashref->{c}), "hashref -- c still doesn't exist"); ok( ! exists( $hashref->{c}->{d} ), "hashref, deeper -- c->{d} doesn't + exist"); ok( ! exists( $hashref->{c}->{d} ), "hashref -- c->{d} still doesn't e +xist"); ok( ! exists($hashref->{c}), "hashref -- c still doesn't exist"); #fai +ls. c does exist. ok( ! defined($hashref->{c}), "hashref -- c still doesn't exist"); #fa +ils. c is an empty hashfref, which is something other than undef.

In reply to Autovivification for dummies (using Test::More) by tphyahoo

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