Re^2: Formatting dynamic method names

[clinton]

Interesting - here are the results:

#!/usr/bin/perl
use strict;
use warnings;
use Benchmark qw(cmpthese);

package foo;
{
    sub set_var1 { }
    sub set_var2 { }
    sub set_var3 { }
    sub set_var4 { }
    sub set_var5 { }
}

package main;

my $object = bless {}, 'foo';
my %hash = map { ( "var$_" => $_ ) } ( 1 .. 5 );

sub temp_var {
    for ( keys %hash ) {
        my $method = "set_$_";
        $object->$method( $hash{$_} );
    }
}

sub reused_lexical {
    my $method;
    for ( keys %hash ) {
        $method = "set_$_";
        $object->$method( $hash{$_} );
    }
}

sub deref {
    for ( keys %hash ) {
        $object ->${ \"set_$_" }( $hash{$_} );
    }
}

cmpthese( 1_000_000,
          {  temp_var       => \&temp_var,
             deref          => \&deref,
             reused_lexical => \&reused_lexical,
          }
);

                       Rate          deref       temp_var reused_lexic
+al
    deref          173010/s             --           -21%           -2
+7%
    temp_var       218818/s            26%             --            -
+8%
    reused_lexical 238095/s            38%             9%             
+--

(Note: these benchmarks are for interest only, and are firmly in the field of premature optimization)