gaNextGeneration.rb

nextGeneration = -> population {
  population = selection[population]
  elite = population.take(1).flatten
  nextPop = []

  (0..population.length / 2 - 1)
      .each{crossover[
          [] << population[rand(population.length - 1)] << population[rand(population.length - 1)],
          rand(population[1].length - 1)]
      .map{|g| nextPop << g}}
  nextPop = nextPop
              .map{|n| (0..n.length - 1)
              .map{|p| rand(0.0..1.0) < 0.05 ? Genotype[1] : n[p] }.flatten }
  nextPop.sort_by { |n| -fitness[n]}.take(nextPop.length - 1) << elite }