Defining a class
Learn to define a class with the class keyword.
What is a class?
A class is a template used to create objects. In JavaScript it is declared with the class keyword and has a body between curly braces.
The template describes how to make objects; it is not an object itself. From one class you can create as many instances as you need.
Classes work like real-world molds: a 'User' class defines the shared structure for every user.
Class declaration
A class declaration starts with the class keyword, followed by the class name and a body in curly braces.
class User {
// body goes here
}Class names usually start with a capital letter (for example User, Product). The body can be empty; we will add methods and a constructor later.
A declaration does not create an object by itself; it only defines the template.
Exercise Empty-bodied class
Declare a class named Account with an empty body.
Show example solution
Start the class name with a capital letter.
Example solution:
class Account {}Test yourself
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Which keyword declares a class in JavaScript?
- function
- class
- object
- struct
Show answer
class — Correct! The class keyword starts a class declaration.
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Complete the class declaration
class ____ { }Show answer
class User { } -
Match the concepts
- class
- declares a class
- { }
- class body
- class User {}
- empty-bodied class
- User
- class name