#!/usr/bin/env perl
use strict;
use warnings;
use Data::Dump;

sub collectLeaves ($) {
    my ( $ds, $leaves ) = @_;
    $leaves = defined($leaves) ? $leaves : [];
    if ( ref $ds eq 'ARRAY' ) {
        &collectLeaves( $_, $leaves ) for ( @{$ds} );
    }
    elsif ( ref $ds eq 'HASH' ) {
        &collectLeaves( $ds->{$_}, $leaves ) for ( keys %{$ds} );
    }
    else {
        push @{$leaves}, $ds;
    }
    return @{$leaves};
}

my $hash = {
    key1 => [ 3,4,5,6 ],
    key2 => [ 7,8,9,10 ],
    key3 => [
        d1 => {
            42 => [ 'blue' ],
            58 => [ 7 ],
        }
    ]
};

my @wanted = grep { $_ == 7 } collectLeaves $hash;

dd @wanted;

# (7, 7)

[download]
Here is a way. You can also write a more customized sub for your data structure. Not sure if this passes the test for elegant though :)

In reply to Re: howto map/grep a complex structure by trippledubs
in thread howto map/grep a complex structure by Anonymous Monk

Title:
Use:  <p> text here (a paragraph) </p>
and:  <code> code here </code>
to format your post, it's "PerlMonks-approved HTML":


  • Posts are HTML formatted. Put <p> </p> tags around your paragraphs. Put <code> </code> tags around your code and data!
  • Titles consisting of a single word are discouraged, and in most cases are disallowed outright.
  • Read Where should I post X? if you're not absolutely sure you're posting in the right place.
  • Please read these before you post! —
  • Posts may use any of the Perl Monks Approved HTML tags:
    a, abbr, b, big, blockquote, br, caption, center, col, colgroup, dd, del, details, div, dl, dt, em, font, h1, h2, h3, h4, h5, h6, hr, i, ins, li, ol, p, pre, readmore, small, span, spoiler, strike, strong, sub, summary, sup, table, tbody, td, tfoot, th, thead, tr, tt, u, ul, wbr
  • You may need to use entities for some characters, as follows. (Exception: Within code tags, you can put the characters literally.)
            For:     Use:
    & &amp;
    < &lt;
    > &gt;
    [ &#91;
    ] &#93;
  • Link using PerlMonks shortcuts! What shortcuts can I use for linking?
  • See Writeup Formatting Tips and other pages linked from there for more info.