use strict;
use JSON;
my %hash = %{from_json(do{ local $/ = <DATA> })};
__DATA__
{
"440035528809":"6946395707444",
"332679554392":"162874763688655",
"913537320343":"56726180700920"
}

##</code><code>##

use 5.010;
open my $perl, '>', 'perl.pl';
open my $data, '>', 'data.pl';
open my $json, '>', 'json.pl';

print $perl <<'CODE';
use strict;
my %hash = (
CODE

print $data <<'CODE';
use strict;
my %hash;
while (<DATA>)
{
	my ($k, $v) = split /\t/o;
	$hash{$k} = $v;
}
__DATA__
CODE

print $json <<'CODE';
use strict;
use JSON;
my %hash = %{from_json(do{ local $/ = <DATA> })};
__DATA__
{
CODE

my $last = 100_000;
for (1 .. $last)
{
	my $k = int rand 1_000_000_000_000;
	my $v = int rand 1_000_000_000_000_000;
	my $comma = $_==$last?'':',';
	print $perl "$k=>'$v',\n";
	print $data "$k\t$v\t\n";
	print $json "\"$k\":\"$v\"$comma\n";
}

print $perl <<'CODE';
);
CODE

print $json <<'CODE';
}
CODE

close $perl;
close $json;
close $data;
say "Standard Perl hash...";
system("time perl perl.pl");
say "Reading TSV from __DATA__...";
system("time perl data.pl");
say "Reading JSON from __DATA__...";
system("time perl json.pl");
unlink "perl.pl";
unlink "data.pl";
unlink "json.pl";