One option is to short circuit the autovivification:
use strict;
use warnings;
my %Hash;
$Hash{44.52}{param1}{key1} = [ 101.01, 'val1' ];
$Hash{95.01}{param2}{key2} = [ 101.02, 'val2' ];
my $neededVal = 80.0;
if ( exists $Hash{$neededVal}
and exists $Hash{$neededVal}{param1}
and exists $Hash{$neededVal}{param1}{key1} )
{
print "DEFINED";
}
else {
for ( keys %Hash ) {
print "$_\n";
}
}
Output:
95.01
44.52
Update I: Added the needed defined, in case of an earlier (for example) $Hash{$neededVal}{param1}{key1} = 0.
Update II: Replaced defined with exists. Thank you, choroba.
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