#!/usr/bin/perl
use warnings;
use strict;

use Benchmark qw{ cmpthese };

sub precat {
    my ($string, $prefix) = @_;
    $string = $prefix . $string;
    $string
}

sub Substr {
    my ($string, $prefix) = @_;
    substr $string, 0, 0, $prefix;
    $string
}

sub subst {
    my ($string, $prefix) = @_;
    $string =~ s/^/$prefix/;
    $string
}

use Test::More;
is precat('def', 'abc'), 'abcdef', 'correct concat';
is Substr('def', 'abc'), 'abcdef', 'same substr';
is subst('def', 'abc'), 'abcdef', 'same subst';
done_testing(3);

cmpthese( -3,
           { precat => q( precat 'def', 'abc' ),
             substr => q( Substr 'def', 'abc' ),
             subst  => q( subst  'def', 'abc' ),
           });


##</code><code>##

ok 1 - correct concat
ok 2 - same substr
ok 3 - same subst
1..3
            Rate  subst precat substr
subst  1770916/s     --   -38%   -47%
precat 2860656/s    62%     --   -15%
substr 3350927/s    89%    17%     --


##</code><code>##

($q=q:Sq=~/;[c](.)(.)/;chr(-||-|5+lengthSq)`"S|oS2"`map{chr |+ord
}map{substrSq`S_+|`|}3E|-|`7**2-3:)=~y+S|`+$1,++print+eval$q,q,a,