This is a hash of hash references that contain array references. (I think ;)
To print them out, you have to dereference the entire structure as an array. See the full sample program below for further details on this dereferencing and accessing individual elements.
say @{ $An{$id}->{b} };
I couldn't find the original thread, so I have no idea what is in the lettered arrays, so I just threw something together as an example:
#!/usr/bin/perl
use warnings;
use strict;
use 5.10.0;
my @bb = ( 41..60 );
my @cc = ( 21..40 );
my @IDs = ( 1..20 );
my %An;
my $idx = 0;
foreach my $n (@IDs) {
push @{$An{$n}->{b}} , $bb[$idx];
push @{$An{$n}->{c}} , $cc[$idx];
$idx++;
}
# $An{$id}->{b} is an array reference.
# To access its elements, we must dereference it
# by encompassing the data structure within the
# array dereferencing operator: @{}
# to iterate over the entire array reference
# note the @{} block surrounding the data structure
say map { $_, ' ' } @{ $An{1}->{b} };
# to print out a single element of the aref
say @{ $An{1}->{b} }[0];
# to print out the zeroeth element contained
# in the 'b' value of each %An ID key:
for my $id ( @IDs ){
say @{ $An{ $id }->{ b } }[0];
}
As for your other question, you should always declare your variables in the smallest scope possible... ie. as close to the block you are going to use them in, and where possible, within the block you'll use them in. Having a whole boatload of variables declared needlessly at the top of the program is both unsightly and makes for hard to follow code.
-
Are you posting in the right place? Check out Where do I post X? to know for sure.
-
Posts may use any of the Perl Monks Approved HTML tags. Currently these include the following:
<code> <a> <b> <big>
<blockquote> <br /> <dd>
<dl> <dt> <em> <font>
<h1> <h2> <h3> <h4>
<h5> <h6> <hr /> <i>
<li> <nbsp> <ol> <p>
<small> <strike> <strong>
<sub> <sup> <table>
<td> <th> <tr> <tt>
<u> <ul>
-
Snippets of code should be wrapped in
<code> tags not
<pre> tags. In fact, <pre>
tags should generally be avoided. If they must
be used, extreme care should be
taken to ensure that their contents do not
have long lines (<70 chars), in order to prevent
horizontal scrolling (and possible janitor
intervention).
-
Want more info? How to link
or How to display code and escape characters
are good places to start.
|