how to define a static property in the ES6 classes [duplicate]

Answer 1

One way of doing it could be like this:

let _cards = [];
class Game{
    static get cards() { return _cards; }
}

Then you can do:

Game.cards.push(1);
console.log(Game.cards);

You can find some useful points in this discussion about including static properties in es6.

Answer 2

class Game{
   constructor(){}
}
Game.cards = [];

Game.cards.push(1);
console.log(Game.cards);

You can define a static variable like that.