Beefy Boxes and Bandwidth Generously Provided by pair Networks
Perl Monk, Perl Meditation
 
PerlMonks  

Comment on

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

Use a tied hash.

package DefaultHash; sub TIEHASH { my $class = shift; my $default = shift; my $self; $self->{_DEFAULT} = $default; $self->{_HASH} = {}; return bless $self, $class; } sub FETCH { my $self = shift; my $key = shift; return exists $self->{_HASH}{$key} ? $self->{_HASH}{$key} : $self->{_DEFAULT} } sub EXISTS { my $self = shift; my $key = shift; return exists $self->{_HASH}{$key}; } sub FIRSTKEY { my $self = shift; my $foo = keys %{$self->{_HASH}}; # Reset each return each %{$self->{_HASH}}; } sub NEXTKEY { my $self = shift; return each %{$self->{_HASH}}; } sub CLEAR { my $self = shift; $self->{_HASH} = {}; } sub DELETE { my $self = shift; my $key = shift; return delete $self->{_HASH}{$key}; } sub STORE { my $self = shift; my $key = shift; my $value = shift; $self->{_HASH}{$key} = $value; } package main; tie( my %hash, 'DefaultHash', 'a default value' ); %hash = ( a => 1, b => 2, c => 3 ); print "$_ => $hash{$_}\n" for qw(a b c d);


TGI says moo


In reply to Re: Default Hash Key by TGI
in thread Default Hash Key by tford

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
  • 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?
    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 making s'mores by the fire in the courtyard of the Monastery: (5)
    As of 2014-08-31 04:14 GMT
    Sections?
    Information?
    Find Nodes?
    Leftovers?
      Voting Booth?

      The best computer themed movie is:











      Results (294 votes), past polls