​

function setup() {

  createCanvas(400, 400);

  rectMode(CENTER);

  for (var i = 0; i < 10; i++) {

    cars[i] = new Car(random(50, 100), random(20, 50),

                                    random(0, width), random(0, height),

                                        random(0, 3));

  }

}

​

function draw() {

  background(220);

  for (var i = 0; i < cars.length; i++) {

    cars[i].display();

    cars[i].move();

    cars[i].reset();

  }

}

​

class Car {

  constructor(height, width, x, y, speed) {

    this.height = height;

    this.width = width;

    this.x = x;

    this.y = y;

    this.speed = speed;

  }

  display() {

    rect(this.x, this.y, 

         this.height, this.width);

  }

  move() {

    this.x = this.x + this.speed;

  }

  reset() {

    if (this.x > width) {

      this.x = 0;

    }

  }

}

​