sub gene_length {
    my @gls = sort map { length } keys %genome;
    die "Invalid genotype" unless $gls[0] == $gls[$#gls];
    return $gls[0];
}

##</code><code>##

use List::Util 'first';
sub check_for_winner {
    return first { get_result($_) == $target } @population
}

##</code><code>##

use List::Util 'sum';
sub get_population_fitness_score {
    return sum map { get_fitness_score($_) } @population;
}