comment on

Recursion is the trick:

use strict;
use warnings;

my %hash = (
    1 => {
        a => {
            i => 'level 3',
            ii => 'level 3',
            iii => 'level 3',
            },
        b => {
            i => 'level 3',
            ii => 'level 3',
            iii => 'level 3',
            },
        },
    2 => {a => 'level2', b => 'level2'},
    3 => 'level 1',
    4 => 'level 1',
    );
    
print dumpHash(\%hash);


sub dumpHash {
    my ($element, $indent) = @_;
    
    $indent ||= '';
    
    return "$indent$element\n" unless 'HASH' eq ref $element;
    
    my $str= '';
    for my $key (sort keys %$element) {
        $str .= "$indent$key =>\n";
        $str .= dumpHash ($element->{$key}, $indent . '    ');
    }
    
    return $str;
}
[download]

Prints:

1 =>
    a =>
        i =>
            level 3
        ii =>
            level 3
        iii =>
            level 3
    b =>
        i =>
            level 3
        ii =>
            level 3
        iii =>
            level 3
2 =>
    a =>
        level2
    b =>
        level2
3 =>
    level 1
4 =>
    level 1
[download]

DWIM is Perl's answer to Gödel

In reply to Re: Traverse an unknown multi-dimensional hash by GrandFather
in thread Traverse an unknown multi-dimensional hash by Anonymous Monk

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