Genetic Algorithm Reproduction transcribed to JavaScript

genetic_reproduction.js

GA.evolvePopulation = function (generation) {
    var newGeneration = new Population(generation.populationSize(), false);
    var elitismOffset = 0;
    //keep best offsrping from past generation in first position if elitism is enabled
    if (GA.elitism) {
        newGeneration.saveTour(0, pop.getFittest());
        elitismOffset = 1;
    }
    //choose parent and "mate" - create new offspring from current generation
    for (var i = elitismOffset; i < newGeneration.populationSize(); i++) {
        //select parents
        var parent1 = GA.parentSelection(generation);
        var parent2 = GA.parentSelection(generation);
        var child = GA.crossover(parent1, parent2);
        newGeneration.saveOffspring(i, child);
    }
    //mutation - don't mutate first offsprint if elitism enabled
    for (var i = elitismOffset; i < newGeneration.populationSize(); i++) {
        GA.mutate(newGeneration.getTour(i));
    }
    return newGeneration;
}