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Re: Dynamically create a foreach loop within a foreach loop?

by kcott (Bishop)
on Dec 11, 2013 at 15:56 UTC ( #1066642=note: print w/replies, xml ) Need Help??


in reply to Dynamically create a foreach loop within a foreach loop?

G'day jdlev,

Here's an example using recursion. You'll need to modify this depending on what you want to do in the innermost loop: I just print the values. Also note that I've used 'sort keys %hash' to get consistent output; you may not need the additional overhead of sorting (in this case, just use 'keys %hash').

#!/usr/bin/env perl use strict; use warnings; my %x = ( a => 1, b => 2 ); my %y = ( c => 3, d => 4 ); my %z = ( e => 5, f => 6 ); multi_for([\%x, \%y, \%z]); sub multi_for { my ($hashes, $values, $index) = @_; $values = [] unless defined $values; $index = 0 unless defined $index; if ($#$hashes >= $index) { my %hash = %{$hashes->[$index]}; for (sort keys %hash) { multi_for($hashes, [@$values, $hash{$_}], $index + 1); } } else { # Do something with $values, e.g. print "@$values\n"; } }

Output:

1 3 5 1 3 6 1 4 5 1 4 6 2 3 5 2 3 6 2 4 5 2 4 6

-- Ken

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