How can you define a class in JavaScript?

Defining a class in JavaScript is accomplished by using the class keyword, which is a part of the ECMAScript 2015 (ES6) specification. When you use this keyword, you initiate the creation of a class, which is a blueprint for creating objects with shared properties and methods. The syntax follows this structure: you write class ClassName { ... }, where ClassName is the identifier for your class.

Classes in JavaScript provide a clearer, more syntactical way to create objects and handle inheritance compared to the older function-based constructor approach. They can include a constructor method for initializing instance properties, as well as other methods defined on the class prototype. This modern, class-based approach aligns with object-oriented programming principles and improves code readability.

Using the define keyword, function declarations for creating objects, or the object keyword does not adhere to the JavaScript class syntax and will not successfully create a class. Therefore, the correct use of the class keyword is what allows developers to harness the capabilities of classes in a clean and effective manner.