JavaScript

Master JavaScript runtime engine, closures, event loop, async patterns, ES6+, and OOP — 172 topics across 18 chapters.

Start Learning View Modules

172

Topics

18

Chapters

25h

Est. Time

Progress0/172 (0%)

All Modules

Click any topic to start learning

1

JS Fundamentals

10 topics

0% done

1Introduction to JavaScript 2How JavaScript Runs (Engines & Runtime)3Variables — var, let, const 4Data Types — Primitives & Reference 5Type Coercion & Conversion 6Operators 7Template Literals & String Methods 8Conditional Statements 9Loops 10Error Handling

2

Functions

10 topics

0% done

1Function Declarations vs Expressions 2Arrow Functions 3Parameters — Default, Rest, Destructured 4Return Values & Implicit Returns 5IIFE (Immediately Invoked Function Expressions)6Higher-Order Functions 7Callback Functions 8Recursion 9Pure Functions & Side Effects 10Function Composition & Currying

3

Scope & Closures

7 topics

0% done

1Global Scope vs Local Scope 2Block Scope & Lexical Scope 3Hoisting — Variables & Functions 4The Temporal Dead Zone (TDZ)5Closures — How & Why 6Practical Closure Patterns 7Memory Leaks from Closures

4

Objects & Prototypes

10 topics

0% done

1Object Literals & Property Access 2Computed Properties & Property Shorthand 3Object Destructuring 4Object Methods 5Shallow Copy vs Deep Copy 6The this Keyword — Rules & Binding 7call, apply, bind 8Prototypal Inheritance 9The Prototype Chain 10Object.create & Object.getPrototypeOf

5

Arrays & Iterables

11 topics

0% done

1Array Creation & Access 2Array Destructuring 3Mutating Methods 4Non-Mutating Methods 5forEach vs map vs for...of 6Spread Operator & Rest Patterns 7Array-like Objects & Array.from 8Iterators & the Iterable Protocol 9Generators 10Sets & WeakSets 11Maps & WeakMaps

6

Asynchronous JavaScript

11 topics

0% done

1The Call Stack & Event Loop 2Microtasks vs Macrotasks 3setTimeout, setInterval, requestAnimationFrame 4Callbacks & Callback Hell 5Promises 6Promise Combinators 7async / await 8Error Handling with async/await 9Top-Level Await 10Abort Controller & Cancelling Async Operations 11Async Iterators & for await...of

7

DOM Manipulation

11 topics

0% done

1What is the DOM?2Selecting Elements 3Creating & Inserting Elements 4Modifying Attributes & Classes 5Event Listeners 6Event Object & Event Flow 7Event Delegation 8Form Handling & Validation 9Scroll Events & Intersection Observer 10MutationObserver 11Shadow DOM Basics

8

Browser APIs & Web APIs

14 topics

0% done

1localStorage & sessionStorage 2Cookies 3Fetch API 4XMLHttpRequest (Legacy)5URL & URLSearchParams 6History API & Navigation 7Geolocation API 8Notifications API 9Clipboard API 10Web Workers 11Service Workers & Caching Basics 12WebSockets 13Server-Sent Events (SSE)14File API & Blob

9

ES6+ Modern JavaScript

14 topics

0% done

1let & const (Recap & Edge Cases)2Destructuring (Advanced Patterns)3Spread & Rest Operators (Deep Dive)4Symbols & Well-Known Symbols 5Proxy & Reflect 6Tagged Template Literals 7Optional Chaining (?.)8Nullish Coalescing (??)9Logical Assignment Operators (&&=, ||=, ??=)10Structured Clone & structuredClone()11Import Assertions & Import Attributes 12Array.groupBy & Object.groupBy 13Promise.withResolvers 14Decorators

10

Modules & Bundling

8 topics

0% done

1Script Tags & Global Scope Problems 2CommonJS — require & module.exports 3ES Modules — import & export 4Named Exports vs Default Exports 5Dynamic Imports — import()6Module Resolution & Node.js ESM 7Tree Shaking 8Bundlers Overview — Webpack, Vite, Rollup, esbuild

11

OOP in JavaScript

9 topics

0% done

1Constructor Functions & the new Keyword 2ES6 Classes — Syntax & Semantics 3Class Fields — Public & Private (#)4Static Methods & Properties 5Inheritance — extends & super 6Mixins & Composition over Inheritance 7Abstract Patterns (Simulating Abstract Classes)8The instanceof Operator & Symbol.hasInstance 9Getter & Setter Accessors

12

Functional Programming

8 topics

0% done

1FP Principles — Immutability, Purity, Referential Transparency 2First-Class Functions 3Higher-Order Functions (Deep Dive)4Currying & Partial Application 5Function Composition & Piping 6Monads, Functors & Maybe Pattern (Conceptual)7Immutable Data Structures (Object.freeze, Immer)8Transducers

13

Design Patterns

11 topics

0% done

1Module Pattern & Revealing Module Pattern 2Singleton Pattern 3Factory Pattern 4Observer Pattern (PubSub)5Strategy Pattern 6Decorator Pattern 7Proxy Pattern 8Command Pattern 9Iterator Pattern 10Mediator Pattern 11MVC / MVVM / Flux Patterns

14

Performance & Optimization

10 topics

0% done

1JavaScript Engine Internals (V8, JIT Compilation)2Memory Management & Garbage Collection 3Memory Leaks — Common Causes & Detection 4Debounce & Throttle 5requestAnimationFrame for Smooth Animations 6Virtual DOM vs Direct DOM 7Lazy Loading & Code Splitting 8Web Vitals — LCP, FID, CLS, INP 9Performance Profiling with DevTools 10Web Workers for CPU-Intensive Tasks

15

Testing JavaScript

8 topics

0% done

1Why Testing Matters 2Unit Testing with Jest 3Testing Async Code 4Mocking — Functions, Modules, Timers 5Integration Testing Concepts 6End-to-End Testing with Playwright/Cypress (Overview)7Test-Driven Development (TDD)8Code Coverage

16

Security

8 topics

0% done

1Cross-Site Scripting (XSS) — Stored, Reflected, DOM-Based 2Cross-Site Request Forgery (CSRF)3Content Security Policy (CSP)4Sanitizing User Input 5CORS — Cross-Origin Resource Sharing 6Secure Cookie Flags (HttpOnly, Secure, SameSite)7Prototype Pollution 8Supply Chain Attacks (npm)

17

JavaScript Projects

5 topics

0% done

1Build a Stopwatch/Timer App 2Build an Infinite Scroll Feed 3Build a Kanban Board (Drag & Drop)4Build a Markdown Previewer 5Build a Mini Search Engine (Client-Side)

18

JavaScript Interview Prep

7 topics

0% done

1Top 50 JavaScript Interview Questions 2Tricky Output-Based Questions 3Polyfills — bind, map, filter, reduce, Promise.all, debounce, throttle 4Event Loop Execution Order Questions 5Closure & Hoisting Gotchas 6this Keyword Edge Cases 7Machine Coding Patterns — JavaScript