let Parent = Object.assign(
    Object.create(null),
    {
        new: function () {
            let obj = Object.create(this);
            return obj;
        },
        greet: function () {
            console.log("Hello!");
        }
    }
);

let Child = Object.assign(
    Object.create(Parent),
    {
        new: function (name) {
            let obj = Object.create(this);
            obj.name = name;
            return obj;
        },
        greet: function () {
            Parent.greet.call(this);
            console.log(`I'm ${this.name}`);
        }
    }
);

let someone = Parent.new();
someone.greet();

let alice = Child.new("Alice");
alice.greet();