super.js

// ES6 style
class Gorilla extends Animal {
    constructor(name, weight) {
        super(name, weight);
    }

    showVigour() {
        return `${super.eat()} ${this.poundChest()}`;
    }

    dailyRoutine() {
        return `${super.wakeUp()} ${this.poundChest()} ${super.eat()} ${super.sleep()}`;
    }
    // ...
}

// Traditional style
function Gorilla(name, weight) {
    Animal.call(this, name, weight);
}

Gorilla.prototype = Object.create(Animal.prototype);
Gorilla.prototype.constructor = Gorilla;

Gorilla.prototype.showVigour = function () {
    return `${Animal.prototype.eat.call(this)} ${this.poundChest()}`;
}

Gorilla.prototype.dailyRoutine = function() {
    return `${Animal.prototype.wakeUp.call(this)} ${this.poundChest()} ${Animal.prototype.eat.call(this)} ${Animal.prototype.sleep.call(this)}`;
}
// ...