module.exports = function(ecs, game) {
ecs.addEach(function decayLifeSpan(entity, elapsed) {
var lifeSpan = game.entities.getComponent(entity, "lifeSpan");
lifeSpan.current += elapsed;
if (lifeSpan.current >= lifeSpan.max) {
game.entities.destroy(entity);
}
}, "lifeSpan");
};