Beefy Boxes and Bandwidth Generously Provided by pair Networks
Clear questions and runnable code
get the best and fastest answer

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
It doe not return undef in scalar context, it still returns the empty list, but that will evaluate to undef.

I don't think this kind of distinction is particularly useful --- the docs clearly state that in scalar context a bare return returns undef ... whether that is because the empty list evaluates to undef in scalar context or that an undef is explicitly returned is not relevant to this discussion.

Using return without args just means: return wantwarray()? () : undef; and if that is the behaviour you desire, using a bare return is clear, concise, well documented, and convenient.

If your sub normally returns a list with more than one element, use an explicit return ();.

I don't see how that is more explicit. Both return; and return (); are exactly the same --- calling return with no arguments --- and they both do the context sensitive polymorhpic return (undef or empty list). Your way does not seem to me to be more explicitly passing an empty list any more than print (); vs print; is more explicitly passing an empty list to the print function.

In reply to Re: Re: Re: undef'ing @arrays caveat by danger
in thread undef'ing @arrays caveat by vladb

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, 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, 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.
  • Log In?

    What's my password?
    Create A New User
    and all is quiet...

    How do I use this? | Other CB clients
    Other Users?
    Others browsing the Monastery: (4)
    As of 2018-07-19 23:36 GMT
    Find Nodes?
      Voting Booth?
      It has been suggested to rename Perl 6 in order to boost its marketing potential. Which name would you prefer?

      Results (421 votes). Check out past polls.