Classes and objects

The notion of classes and objects is fundamental to programming languages. JavaScript allows them to be used as well.

A class is used to represent any type of data. For example, people, customers, cars, and so on. We can define a class to represent each of these types of elements, for example, a Person class to represent people, a Client class to represent customers, and a Car class to represent cars.

Note

Note that the class name traditionally begins with an uppercase letter.

An object, on the other hand, will be a particular element of a class (this element will be also called an instance). For example, among all the people of the class Person, the person identified by his name “Clinton” and his first name “Bill” represents a particular object of the class Person. This object can be associated, for example, with the variable p in the program. We can thus create variables to identify each object associated with the class...