TypeScript Access Static Variables Using Instances

Question

So in most OOP languages static variables can also be called class variables, ie their value is shared among all instances of this class. For example,

Answer 1

First option is to create instance accessors to static variable:

class GreenBullet
{
   static ammo: number = 0;
   get ammo(): number { return GreenBullet.ammo; }
   set ammo(val: number) { GreenBullet.ammo = val; }
}
var b1 = new GreenBullet();
b1.ammo = 50;
var b2 = new GreenBullet();
console.log(b2.ammo); // 50

If you want all subclasses of Bullet (including itself) to have separate ammo count, you can make it that way:

class Bullet
{
   static ammo: number = 0;
   get ammo(): number { return this.constructor["ammo"]; }
   set ammo(val: number) { this.constructor["ammo"] = val; }
}
class GreenBullet extends Bullet { }
class PinkBullet extends Bullet { }

var b1 = new GreenBullet();
b1.ammo = 50;
var b2 = new GreenBullet();
console.log(b2.ammo); // 50
var b3 = new PinkBullet();
console.log(b3.ammo); // 0

On a side note, I'm fairly sure you should not store bullet count in a static variable.