JavaScript Tutorial: Classes & Objects
ES6 classes, constructor, methods, getters/setters, static methods, and private fields.
Build your own types
Classes are blueprints for custom objects. Before ES6 classes (2015), JavaScript used function constructors — messy and error-prone. Classes give us clean syntax for the same prototype-based system underneath.
One important difference from Python/Java: JavaScript classes are syntactic sugar over prototypes — the mechanics are different even if the syntax looks similar.
What you'll learn in this JavaScript classes & objects tutorial
This interactive JavaScript tutorial has 7 hands-on exercises. Estimated time: 22 minutes.
- Your first class — A class is a blueprint for creating objects with the same structure.
- Add methods to a class — Add two methods to the `BankAccount` class:
- Getters and setters — Getters and setters look like properties but call functions:
- Static methods — no instance needed — `static` methods belong to the class itself, not instances:
- Private fields with # — ES2022 added real private fields with `#`. Unlike the old `_name` convention, these actually enforce privacy:
- Method chaining — Method chaining lets you call multiple methods in sequence:
- Build a shopping cart class — Final challenge — no starter code.
JavaScript Classes & Objects concepts covered
- Build your own types