perlhashrefperl-hash

Perl access value from Hash Reference

In my Perl code, I ended up having a hash reference like below. I would like to access an individual element from it. I tried multiple ways, but I was not able to fetch it.

#!/usr/bin/perl
#use strict;
use Data::Dumper;
my %h={'one'=>1,'two'=>2};
print Dumper($h{'one'});

Output

$VAR1 = undef;
Solution

  • Use parentheses to construct your hash, not braces:

    use strict;
use warnings;
use Data::Dumper;

my %h = ('one'=>1, 'two'=>2);
print Dumper($h{'one'});

    Braces are used to construct a hash reference.

    Also, add use warnings;, which would have generated a message that there was a problem with your code.

    Or, if you really wanted a hashref:

    my $h = {'one'=>1, 'two'=>2};
print "$h->{one}\n";