Returning a function (CodeCombat) / helper

gistfile1.txt

// Your goal is to keep at least one flower alive for 60 seconds.
// set 3 new locations
var LOCATIONS = [
    {x: 72, y: 44},
    {x: 49, y: 59},
    {x: 50, y: 25},
    {x: 23, y: 43}
];
// loop through all locations 
// build a tower on each of them
hero.findLocationsAndBuildTowers = function (nextTower) {
    for (var pos; pos = nextTower(); ) hero.buildXY("arrow-tower", pos.x, pos.y);
};





// summon new soldiers if there is enough money
hero.summonSoldiers = function() {
    if (hero.gold > hero.costOf("soldier")) {
        hero.summon("soldier");
    }
};

hero.commandSoldiers = function(nextSoldier, go) {
    for (var soldier; soldier = nextSoldier(); ) {
        if (!soldier.spot) hero.command(soldier, "defend", soldier.spot = go() || go());
    }
};

// collect gold
hero.collectGoldForSoldiers = function() {
    var items = hero.findItems();
    var item = hero.findNearest(items);
    if (item) {
        var itemPos = item.pos;
        hero.move(itemPos);
    }
};

// STRATEGY
var nextPosition = makeGetNext(LOCATIONS);
var nextTower = makeGetNext(LOCATIONS);
while (true) {
    var enemies = hero.findEnemies();
    hero.collectGoldForSoldiers();
    hero.summonSoldiers();
    var soldiers = hero.findByType("soldier");
    hero.commandSoldiers(makeGetNext(soldiers), nextPosition);
    if (soldiers.length >= 12) { 
        hero.findLocationsAndBuildTowers(nextTower);
    }
}
// Helper
function makeGetNext (path) {
  var len = path.length + 1;
  var position = 0;
  return function getNext () {
    var location = path[position%len];
    position += 1;
    return location;
  };
}