Documentation: Perl Data Structures Cookbook and Perl references and nested data structures.
#!/usr/bin/perl
use warnings;
use strict;
use Data::Dumper;
my @file_attachments = (
{file => 'test1.zip', price => '10.00', des
+c => 'the 1st test'},
{file => 'test2.zip', price => '12.00', des
+c => 'the 2nd test'},
{file => 'test3.zip', price => '13.00', des
+c => 'the 3rd test'},
{file => 'test4.zip', price => '14.00', des
+c => 'the 4th test'}
);
# Get the number of items (hashes) in the array.
my $file_no = scalar (@file_attachments);
# $file_no is now: 4 in this instance as there is 4 hashes in the arra
+y.
# Looping through the hash and printing out all the hash "file" elemen
+ts.
for my $file_attachment (@file_attachments)
{
print "$file_attachment\n";
}
# Looping through the hash and printing out all the hash "price" eleme
+nts.
for my $file_attachment (@file_attachments)
{
print $file_attachment->{price}, "\n";
}
# Looping through the hash and printing out all the hash "desc" elemen
+ts.
for my $file_attachment (@file_attachments)
{
print $file_attachment->{desc}, "\n";
}
# Change price to an array reference.
$file_attachments[0]{price} = [12, 12.5];
$file_attachments[1]{price} = [ $file_attachments[1]{price} ];
push @{ $file_attachments[1]{price} }, 10.5;
$file_attachments[2]{price} = [];
@{ $file_attachments[2]{price} } = (13, 13.5);
print Dumper \@file_attachments;
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