On the subject of style: I like to decompose nested-structure dereferences into "sensical" single-layer dereferences, as below:
#! /usr/bin/perl -w
use strict;
my @AoH=( { chapter => "Basic",
page => [
{ paragraph => "lesson1"},
{ paragraph => "lesson2"}
]
},
{ chapter => "Advanced",
page => [
{ paragraph => "lesson3"},
{ paragraph => "lesson4"}
]
}
);
foreach my $ch (@AoH) {
print $ch->{'chapter'}, "\n";
my $page = $ch->{'page'};
foreach my $paras (@$page) {
print "\t", $paras->{'paragraph'}, "\n";
}
}
I find this makes code using these structures easier to read, although longer. It's a judgement call as to whether your structure is dense enough to warrant the extra code.
(I also like to use -> for every deref and single-quote every hash key, but that's a whole different issue....)
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