Module 5 · 5 chapters

JavaScript Advanced Concepts

Once you are comfortable with functions and data structures, the next step is the patterns professional codebases use every day. Promises coordinate asynchronous work, classes organize related behavior, and try/catch keeps applications from crashing on unexpected input.

This module bridges beginner syntax and production-ready JavaScript. You will learn when to reach for Map instead of a plain object, how Set eliminates duplicates, and how error handling turns fragile scripts into reliable software.

Chapters in this module

Promises & AsyncA Promise represents a value that may not exist yet — pending, fulfilled, or rejected. Learn construction, .then/.catch/.finally chains, combinators, and how promises paved the way for async/await.
ClassesLearn Classes in JavaScript — covering Class Basics, Constructor, Methods, Static Members with interactive visual examples and step-by-step explanations.
InheritanceLearn Inheritance in JavaScript — covering extends, super(), Method Overriding, Multilevel Inheritance with interactive visual examples and step-by-step explanations.
Map, Set & WeakMapLearn Map, Set & WeakMap in JavaScript — covering Map, Set, WeakMap & WeakSet, When to Use What with interactive visual examples and step-by-step explanations.
Error HandlingLearn Error Handling in JavaScript — covering try / catch / finally, Built-in Error Types, Custom Errors, Best Practices with interactive visual examples and step-by-step explanations.

Start with Promises & Async