methods-comparison.js

// ES6 style
class Animal {
    // ...
    eat() {
        return `${this.name} is eating!`;
    }

    sleep() {
        return `${this.name} is going to sleep!`;
    }

    wakeUp() {
        return `${this.name} is waking up!`;
    }
    // ...
}

// Traditional style
Animal.prototype.eat = function() {
    return `${this.name} is eating!`;
}

Animal.prototype.sleep = function() {
    return `${this.name} is going to sleep!`;
}

Animal.prototype.wakeUp = function() {
    return `${this.name} is waking up!`;
}