Beefy Boxes and Bandwidth Generously Provided by pair Networks
Pathologically Eclectic Rubbish Lister
 
PerlMonks  

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
I am getting slightly different behaviours depending on whether I use
screwed $_;
or
screwed "$_";
I use AS 5.6.1
In the first, screwed()::@_ gets clobbered, in the second screwed()::@_ is OK, but @instances is still clobbered.

And if I could just add, to the original poster, that
map {function($_)} @array;
is generally frowned upon - map returns a list, and by not having map on the RHS of an assignment
@result_set = map {function($_)} @array
, that list is considered being used in a void context. This means, in this case, all the hard work of creating a list of results via the map is wasted, the list is thrown away. Because screwed() doesn't explicitly return a value, it defaults to using the return value of the close() statement at the end of the sub. If you really dont care about the return values of applying a function using the elements of an array as parameters, it is 'better'(tm) to use this idiom
foreach (@array) {sub_without_meaningful_return($_)}
This makes it clear that the function has side-effects - that is, the function uses and possibly changes some variable outside its scope- in screwed()'s case, STDOUT is used.
merlyn has lectured me once on this - so I now pass this on.

In reply to Re: opening a file destroys nulling entries in a list?!?! by leriksen
in thread opening a file destroys nulling entries in a list?!?! by matpalm

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!
  • 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?
    Username:
    Password:

    What's my password?
    Create A New User
    Chatterbox?
    and the web crawler heard nothing...

    How do I use this? | Other CB clients
    Other Users?
    Others browsing the Monastery: (7)
    As of 2015-07-03 03:17 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The top three priorities of my open tasks are (in descending order of likelihood to be worked on) ...









      Results (47 votes), past polls