What are some examples of classes in JavaScript?

What are some examples of classes in JavaScript?

In JavaScript, a class is a blueprint for creating objects. Here’s a simple example:

class Car {
    constructor(brand, model) {
        this.brand = brand;
        this.model = model;
    }
    displayInfo() {
        return `Car: ${this.brand} ${this.model}`;
    }
}

const myCar = new Car('Toyota', 'Corolla');
console.log(myCar.displayInfo()); // Car: Toyota Corolla

Can you explain the constructor and methods in this example?

Sure! The constructor is a special method that initializes new objects. In this case, it sets the brand and model properties. The displayInfo method is a regular method that returns a string with the car's information.

What if I want to add more features to the Car class?

You can easily add more methods or properties. For example, you could add a method to calculate the age of the car:

class Car {
    constructor(brand, model, year) {
        this.brand = brand;
        this.model = model;
        this.year = year;
    }
    calculateAge() {
        return new Date().getFullYear() - this.year;
    }
}

Can you show me how to create a subclass?

Absolutely! You can create a subclass using the extends keyword. For example:

class ElectricCar extends Car {
    constructor(brand, model, year, batteryCapacity) {
        super(brand, model, year);
        this.batteryCapacity = batteryCapacity;
    }
    displayBattery() {
        return `Battery Capacity: ${this.batteryCapacity} kWh`;
    }
}