Define & Instantiate Classes in JavaScript

In JavaScript, a class is a reusable template for creating standardized objects.

Classes are used to describe the internal data structure of these objects (their properties) and implement their functionalities (their methods).

In this lesson, you will learn how to declare classes, define their properties and methods, and create objects from them.

Define a class

In JavaScript, classes are defined using the class keyword:

class ClassName {  // class body}

Where:

• ClassName is the user-defined name of the class.
• {} is the body of the class that contains its fields and methods.

Note: By convention, class names always start with a capital letter and are written in CamelCase.

Instantiate a class

To instantiate a class, which means creating a object from it (i.e. an instance), you can use the new keyword, followed by the name of the class, and a pair of parentheses ():