6.4. Randomizing shapes

Now that you have a quick and easy way to create shapes, there's nothing to stop you randomizing their creation. The cool thing is that because you're using objects, it's dead simple. First off, you need to change the Shape class to define a width and height:

var Shape = function(x, y, width, height) {
        this.x = x;
        this.y = y;
        this.width = width;
        this.height = height;
};