let gravity;

​

function setup() {

  createCanvas(windowWidth, windowHeight - 100);

  gravity = createVector(0, 0.2);

}

​

function draw() {

  background(0);

  if (random(1) < 0.13) {

    fireworks.push(new Firework());

  }

​

  for (let i = fireworks.length - 1; i >= 0; i--) {

    fireworks[i].update();

    fireworks[i].show();

    if(fireworks[i].done()) {

      fireworks.splice(i, 1);

    }

  }

}