Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl-Sensitive Sunglasses

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??

Personally, I go with passing in hash refs most of the time, or shifting off when I only have a single parameter. And in all cases, I just deal with undefs as appropriate. Which sometimes means don't do anything about them - I want the fatal warning (I enable fatal warnings, too, did I forget to mention that?). If it's optional, I use the defined-or operator, // to use either the value or a default:

sub say_hello { my $opts = shift; my $hello_sub = $opts->{hello_sub} // sub { my $o = shift; say "hell +o, ", $o->{who} // 'world' }; $hello_sub->($opts); } say_hello(); # says "hello, world" say_hello({ who => 'temporal'}); # says "hello, temporal" say_hello({ hello_sub => sub { my $o = shift; say "wazzup, ", $o->{zup +} // 'homie' }, zup => 'bro' }); # says "wazzup, bro"
Ok, so the example is getting a bit ridiculous, but you get the idea :-)

I don't check parameters. Almost ever. I've been bitten by too many tools trying to be too smart about their inputs, but when I feed them objects with string overloading or filehandles that aren't files and they fail just because the author didn't realise how automorphic perl variables can be, it gets annoying. Don't assume that the person calling your code is less smart than you. Carp if you have to, but it might just work if you try.

In reply to Re: sub argument passing? (TIMTOWTDI) by Tanktalus
in thread sub argument passing? (TIMTOWTDI) by temporal

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 cooling their heels in the Monastery: (4)
    As of 2018-02-21 05:54 GMT
    Find Nodes?
      Voting Booth?
      When it is dark outside I am happiest to see ...

      Results (275 votes). Check out past polls.