I'm not sure a tutorial is needed. Some common sense guidelines and an example may help:

Umm, actually that's about all you need for guidelines. Don't make whatever code you come up with too complicated to grok. That generally means avoid multiple grep and map usages in one statement. So your example could become:

for $hk (keys %$hash) {
    print "$hk\n" for grep {$_ eq $search} @{$hash->{$hk}->{member}};
}

[download]

for some gain. But trying to roll the whole lot into one statement would be counterproductive.

Premature optimization is the root of all job security

In reply to Re: howto map/grep a complex structure by GrandFather
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.