Beefy Boxes and Bandwidth Generously Provided by pair Networks
We don't bite newbies here... much

Comment on

( #3333=superdoc: print w/ replies, xml ) Need Help??
sub swap { my ($a, $b) = \(@_); ( $$a, $$b ) = ( $$b, $$a ); } my ($x,$y)=(42,666); $\="\n"; print "($x,$y)"; #> (42,666) swap($x,$y); print "($x,$y)"; #> (666,42)
is that idea new?


for completeness, this works too:

sub swap { my $a = \shift; my $b = \shift; ( $$a, $$b ) = ( $$b, $$a ); }

Cheers Rolf

UPDATE: I was asked if this example accomplishes anything that the following doesn't:
sub swap { ($_[0], $_[1] ) = ( $_[1], $_[0] ); }
no it doesn't ) I just wanted to meditate about a pattern to have named aliases.

Compare PBP's critic about using unreadable variables like $_[0].

of course swap() is too short to profit from named arguments.

) except by not dieing on literals.

In reply to RFC: Idiom for named read-write arguments (aliases) instead of using $_[0] etc by LanX

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
  • Outside of code tags, you may need to use entities for some characters:
            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 taking refuge in the Monastery: (5)
    As of 2015-03-31 02:47 GMT
    Find Nodes?
      Voting Booth?

      When putting a smiley right before a closing parenthesis, do you:

      Results (660 votes), past polls