Definedness: Explain the difference between false and undefined. Show how to test for each.

Hashes: Show how to test for the existence of a hash key.

Autovivification: Show how to fetch the value in $foo->{'bar'}->{'baz'} without causing $foo->{'bar'} to spring into existence if it didn't exist to begin with.

Sorting: Show how to sort "foo123", "bar123", "baz345", "baz123" numerically first, alphabetically second.

List manipulation: Show how to find how many times the number 5 exists in map {int(rand(6)+1)} 1..20.


Dave

In reply to Re: RFC: Self Assessment Perl by davido
in thread RFC: Self Assessment Perl by LanX

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.