let bubbles = [];

function setup() {

  createCanvas(600, 600);

}

​

function draw() {

  background(0);

  for(let i = 0; i < bubbles.length; i++) { 

    bubbles[i].show();

    bubbles[i].move();

  }

}

​

function mouseDragged() {

  bubbles.push(new Bubble(mouseX, mouseY, random(10, 18)));

}