#!/usr/bin/env perl

use 5.030;
use warnings;

use Storable;

my ($hashfile, $serial_data_for);
INIT {
    $hashfile = 'pm_11148149_storable_first_run.sto';
    $serial_data_for = -e $hashfile ? retrieve($hashfile) : {};
}

my @keys = qw{key1 key2 key3};
my @vals = qw{data1 data2 data3};
$serial_data_for->@{@keys} = @vals;

store($serial_data_for, $hashfile);

##</code><code>##

#!/usr/bin/env perl

use 5.030;
use warnings;

use Storable;
use Data::Dump;

warn "Perl version: $^V\n";

my ($hashfile, $serial_data_for);
INIT {
    $hashfile = 'pm_11148149_storable_first_run.sto';
    $serial_data_for = -e $hashfile ? retrieve($hashfile) : {};
}

say 'Serialised data:';
dd $serial_data_for;

my @keys = qw{key1 key2 key3};
my @vals = qw{data1 data2 data3};
$serial_data_for->@{@keys} = @vals;

store($serial_data_for, $hashfile);

##</code><code>##

ken@titan ~/tmp
$ rm pm_11148149_storable_first_run.sto

ken@titan ~/tmp
$ ls -l pm_11148149_storable_first_run.sto
ls: cannot access 'pm_11148149_storable_first_run.sto': No such file or directory

ken@titan ~/tmp
$ ./pm_11148149_storable_first_run_1.pl
Perl version: v5.30.0
Serialised data:
{}

ken@titan ~/tmp
$ ls -l pm_11148149_storable_first_run.sto
-rw-r--r-- 1 ken None 69 Nov 12 13:00 pm_11148149_storable_first_run.sto

ken@titan ~/tmp
$ ./pm_11148149_storable_first_run_1.pl
Perl version: v5.30.0
Serialised data:
{ key1 => "data1", key2 => "data2", key3 => "data3" }

ken@titan ~/tmp
$ 

##</code><code>##

sub DoIHaveThisData {
    my ($hash, $key) = @_;
    return exists $hash->{$key};
}