Classes

Classes are templates for creating an object. It encapsulates data with code to work on with data. The keyword class is used to create a class. And a specific method called constructor is used for creating and initializing an object created with a class. An example of car class is shown below.

class Car {
  constructor(name, year) {
    this.name = name;
    this.year = year;
  }
  age() {
    let date = new Date();
    return date.getFullYear() - this.year;
  }
}

let myCar = new Car("Toyota", 2021);
console.log(myCar.age()) // 1

Class must be defined before its usage.

In the class body, methods or constructors are defined and executed in strict mode. Syntax not adhering to the strict mode results in error.