Rediscovering JavaScript

Creating Properties

JavaScript now supports C#-style properties. From the caller point of view, a property gives an illusion of a field but works as a method. Let’s revisit the Car class we created earlier and introduce another method that returns a value and then turn that into a property.

Suppose we want to know how old a car is. The year of make is provided when an instance is created. We use the getAge() method to find the age of the car, like so:

getAge() {
  return new Date().getFullYear() - this.year;
}

The method subtracts the year of make from the current year. We invoke this method using the familiar method call syntax:

const car = new Car(2007);

console.log(car.getAge());

That works, but getAge() is a Java-style getter. ...