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Re: How can I populate attributes of a hash into another ?

by Random_Walk (Parson)
on Jul 19, 2013 at 14:12 UTC ( #1045365=note: print w/ replies, xml ) Need Help??


in reply to How can I populate attributes of a hash into another ?

I would flip the data model around. One book may contain multiple chapters. They will also normally be sequentially numbered so I'd make an array of them.

#!/usr/bin/perl use strict; use warnings; my %book = ( name => 'ABC - an adventure', author => 'monk', isbn => '123-890', issn => '@issn', chapter => [], ); $book{chapter}[1] = { name => 'Testing Times', page => 2, }; $book{chapter}[2] = { name => 'Importing Hash', page => 99, }; print "$book{name}\n"; my $i = 1; while (exists $book{chapter}[$i]) { print "Ch: $i '$book{chapter}[$i]{name}' ($book{chapter}[$i]{page} +)\n"; $i++ }
Output:
ABC - an adventure Ch: 1 'Testing Times' (2) Ch: 2 'Importing Hash' (99)

Cheers,
R.

Pereant, qui ante nos nostra dixerunt!


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