medium-10.js

function Base() {}
Base.prototype.foo = function() {return 'foo in Base';};
Base.bar = function() {return 'bar in Base';};

function Child() {}
Object.setPrototypeOf(Child, Base);
Object.setPrototypeOf(Child.prototype, Base.prototype);

const homeCtor = Child;
const homeProto = Child.prototype;
Child.prototype.foo = function() {
    // super.foo();
    return Object.getPrototypeOf(homeProto).foo.call(this);
};
Child.bar = function() {
    // super.bar();
    return Object.getPrototypeOf(homeCtor).bar.call(this);
};

const obj = new Child;
console.log(obj.foo()); // foo in Base
console.log(Child.bar()); // bar in Base