class Game {
    constructor() {
        // public field
        this.name = "unknown";
        this.year = 2000;
    }
}

// up to ES6
function GameES5() {
    // public field
    this.name = "unknown";
    this.year = 2000;

    // private field 
    var developer = "unknown";
}

//Support: TC39: Stage 3, Node: 12+, Chrome: 74+
class GameFields {
    // public field
    name = "unknown";
    year = 2000;

    // private field
    #developer = "unknown";

    showDeveloper() {
        console.log(this.#developer);
    }
}