from non perl programer

Question

Any perl expert can help me to understand this block of perl code

  $a=18;
$b=55;
$c=16;
$d=88;
$mtk = {
    'A'     => [$a, $b],
     'M'   => [$c, $d]

    };

is this dictionary hold char and pair and how to access key and values thanks a lot

Reading about Perl data structures, should help you as well. — Craig Treptow
– Craig Treptow, Commented Jan 16, 2013 at 19:36

gpojd · Accepted Answer · 2013-01-16 19:42:54Z

8

$a, $b, $c, and $d are scalars. $mtk is a reference to a hash of arrayrefs. You can access it like:

print $mtk->{A}[0]; ## 18

I'd suggest the book Learning Perl if you are just getting started and struggling with this code.

perldoc perlreftut

edited Jan 16, 2013 at 19:42

answered Jan 16, 2013 at 19:37

gpojd

23.2k8 gold badges45 silver badges71 bronze badges

Sign up to request clarification or add additional context in comments.

Comments

Atento · Accepted Answer · 2013-01-16 19:46:10Z

1

This is a hash ref for array refs as values. Here is a traverse code below:

for my $key (sort keys %$mtk) {
    print "Current key is $key\n";
    for my $val (@{ $mtk->{$key} }) {
        print "... and one of value is $val\n";
    }
}

The output will be

Current key is A
... and one of value is 18
... and one of value is 55
Current key is M
... and one of value is 16
... and one of value is 88

answered Jan 16, 2013 at 19:46

Atento

8467 silver badges7 bronze badges

Collectives™ on Stack Overflow

from non perl programer

2 Answers 2

Comments

Comments

Your Answer

Hot Network Questions

Collectives™ on Stack Overflow

2 Answers 2

Comments

Comments

Your Answer

Sign up or log in

Post as a guest

Related