Beefy Boxes and Bandwidth Generously Provided by pair Networks
Just another Perl shrine

Comment on

( #3333=superdoc: print w/replies, xml ) Need Help??
Hide the complexity behind an interface.
package My::FieldMap; our %INTERNAL_VALUES = ( 'foo|bar' => 'fb_val' ); our %INTERNAL_NAMES = ( 'foo|bar' => 'fb_val' ); sub _build_key { return lc( join '|', @_); } sub get_internal_name_value { shift if $_[0] eq __PACKAGE__; # Can call as pkg method my $ext_name = shift; my $ext_value = shift; my $composite_key = _build_key( $ext_name, $ext_value ); # probably want to put some error checking code here. # What do you do if called in scalar context? # What if one or both keys don't exist? return ( $INTERNAL_NAMES{$composite_key}, $INTERNAL_VALUES{$composite_key} ); }

Use it like this:

my ($in,$iv) = My::FieldMap->get_internal_name_value( $ext_name, $ext_ +value ); # or my ($in,$iv) = My::FieldMap::get_internal_name_value( $ext_name, $ext_ +value );

Now, when you have to deal with millions of field/name pairs, and you move to Redis or memcached to store them, you just have to update the lookup function.

A good interface with horrible code behind it is 10000% better than the most elegant snippets sprinkled everywhere.

TGI says moo

In reply to Re: A question of style: Composite keys to multiple values by TGI
in thread A question of style: Composite keys to multiple values by Voronich

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 contemplating the Monastery: (2)
    As of 2017-12-18 00:44 GMT
    Find Nodes?
      Voting Booth?
      What programming language do you hate the most?

      Results (466 votes). Check out past polls.