Beefy Boxes and Bandwidth Generously Provided by pair Networks
Just another Perl shrine

comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
The sub is always returning a scalar or a list. Never an array.

The context of the caller is provided to the last expression evaluated in the subroutine. That expression then evaluates to a scalar or list, and that scalar or list is returned.

In your ret_array, a scalar context evaluation of @_ is clearly the number of elements of the _ array, while a list context evaluation is the current contents of the _ array. But it's not "returning" the array. It's returning a copy of the contents (as a list), or the count (as a scalar).

Similarly, for the ret_list subroutine, a scalar context is passed down to the subroutine to cause the last element of that slice to be returned (as a scalar), or in a list context, the entire contents of the _ array are returned (as a list).

Again, at no time is the "array" returned. You're either returning the last expression evaluated in a list context as a list, or the last expression evaluated in a scalar context as a scalar.

-- Randal L. Schwartz, Perl hacker

In reply to Re: Sub cannot return an array? by merlyn
in thread Dereference an array reference by fmogavero

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 the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others chilling in the Monastery: (4)
    As of 2021-04-17 11:08 GMT
    Find Nodes?
      Voting Booth?

      No recent polls found