ES6 JS Classes Inheritance

class Mall {
    constructor(shopname) {
        this.shopname = shopname;
    }
    shopisPresent() {
        return this.shopname +
            ' is present in the  ';
    }
}

class Shop extends Mall {
    constructor(name, mallname) {
        super(name);
        this.mallname = mallname;
    }
    showShop() {
        return this.shopisPresent() +
            this.mallname;
    }
}

class Kiosk extends Shop {
    constructor(name, mallname) {
        super(name, mallname);
    }
    shopisPresent() {
        return super.shopisPresent() +
            this.mallname + ", pss";
    }
}

let newMall = new Shop(
    "Domino", "Select City Walk Mall"
);
let newKiosk = new Kiosk(
    "Domino", "Select City Walk Mall"
);
console.log(newMall.showShop());
console.log(newKiosk.shopisPresent());