my $hash = { a => 'b' };
$hash->{$x}

[download]

would be less confusing (no needless use of references) and less complicated (two fewer operations and one less variable) as 

my %hash = ( a => 'b' );
$hash{$x}

[download]

It's also much faster.

Results:
hash vs hash ref: hash is 30-40% faster.
inline vs hash: hash is 30-40% faster.
global vs local hash: global is 600-700% faster. (Would be even faster if the hash had more elements.)

Benchmark code and numbers: 

use strict;
use warnings;

use Benchmark qw( cmpthese );

{
   my $test_const_hr   = q{                                           
+my $e = $const_hr->{a};              };
   my $test_const_hash = q{                                           
+my $e = $const_hash{a};              };
   my $test_built_hr   = q{ my $built_hr   = { a => 'A', b => 'B' };  
+my $e = $built_hr->{a};              };
   my $test_built_hash = q{ my %built_hash = ( a => 'A', b => 'B' );  
+my $e = $built_hash{a};              };
   my $test_inline_hr  = q{                                           
+my $e = { a => 'A', b => 'B' }->{a}; };

   our $const_hr   = { a => 'A', b => 'B' };
   our %const_hash = ( a => 'A', b => 'B' );

   $_ = 'use strict; use warnings; our $const_hr; our %const_hash; ' .
+ $_
      for $test_const_hr,
          $test_const_hash,
          $test_built_hr,
          $test_built_hash,
          $test_inline_hr;

   cmpthese(-3, {
      const_hr    => $test_const_hr,
      const_hash  => $test_const_hash,
      built_hr    => $test_built_hr,
      built_hash  => $test_built_hash,
      inline_hr   => $test_inline_hr,
   });
}

[download]
                Rate  inline_hr   built_hr built_hash   const_hr const
+_hash
inline_hr   209314/s         --        -3%       -27%       -87%      
+ -90%
built_hr    216267/s         3%         --       -24%       -87%      
+ -90%
built_hash  285632/s        36%        32%         --       -83%      
+ -86%
const_hr   1638207/s       683%       657%       474%         --      
+ -22%
const_hash 2103430/s       905%       873%       636%        28%      
+   --

[download]

In reply to Re: How to access a static hash. by ikegami
in thread How to access a static hash. by gam3

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!
  • 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, details, 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, summary, 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.