my %hash = (
  response => {
    blogs    => [
      {
        url     => 'equipo.tumblr.com',
        name    => 'equipo',
        updated => 1346015230,
      },
      {
        url     => 'linux.tumblr.com',
        name    => 'linuxmint',
        updated => 1345967468,
      },
    ],
  },
);
my @urls = map { $_->{url} } @{$hash{response}{blogs}};

[download]

perldoc perlreftut and peldoc perlref can get you started with references. perldsc and perllol can walk you through manipulating datastructures built using references. I used map (perldoc -f map) to perform the actual data structure transform. But if you're new to some of this it might be easier to achieve the same thing using a foreach loop (perldoc perlsyn) and push (perldoc -f push):

my @urls;
foreach my $blog ( @{$hash{response}{blogs}} ) {
    push @urls, $blog->{url};
}

[download]

Either way @url ends up containing the same list of URL's.

If you don't mind spending a little on a good book, Intermediate Perl is a great tutorial on references, data-structures, classes, and objects (as well as a few other useful things).


Dave

In reply to Re: help to get hash elements by davido
in thread help to get hash elements by danny0085

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.