Beefy Boxes and Bandwidth Generously Provided by pair Networks
laziness, impatience, and hubris

comment on

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

This turns sub1 and sub2 into closures (see 'What's a closure?'). While it is not always necessary to use BEGIN blocks, without them (i.e. normal blocks), declaration order becomes significant.

Update: A trick I use occasionally is to declare a set of lexical variables in a BEGIN block along with access functions. Within the program, only the access functions are visible.

BEGIN { my ($var1, $var2, $var3); my @array1; my %hash1; sub var1 { $var1 = $_[0] if @_; $var1 } sub var2 { $var2 = $_[0] if @_; $var2 } sub var3 { $var3 = $_[0] if @_; $var3 } # for arrays and hashes, call in scalar context and # dereference to manipulate contents sub array1 { wantarray ? @array1 : \@array1 } sub hash1 { wantarray ? %hash1 : \%hash1 } }

Of course, rather than hand code access functions for every variable, I typically define a hash containing my variables as keys, and an AUTOLOAD to define access functions dynamically on first use.


If you GIVE a man a fish you feed him for a day
TEACH him to fish and you feed him for a lifetime

In reply to Re(2): using strict and functions by dmmiller2k
in thread using strict and functions by idunno

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 drinking their drinks and smoking their pipes about the Monastery: (2)
    As of 2021-03-07 10:01 GMT
    Find Nodes?
      Voting Booth?
      My favorite kind of desktop background is:

      Results (120 votes). Check out past polls.