#!/usr/bin/env perl

use strict;
use warnings;

use Benchmark 'cmpthese';

my @x = qw{ABC DEF BXB};
my ($i, $c) = qw{1 B};

cmpthese 0 => {
    index => sub { $i == index($_, $c, $i) ? 1 : 0 for @x },
    substr => sub { $c eq substr($_, $i, 1) ? 1 : 0 for @x },
};