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beginner 4 hours 176 lessons 34 modules

JavaScript Fundamentals

Learn JavaScript from scratch with hands-on projects and real-world examples

By Avinash Jha

Module 1 Introduction to JavaScript

Understand what JavaScript is, where it runs, and write your first script.

📄 What is JavaScript? 10 min 📄 History of JavaScript 10 min 📄 How JavaScript Runs 10 min 📄 Setting Up Your Environment 10 min 📄 Your First Script 10 min 📄 JavaScript Syntax Basics 10 min

Module 2 Variables and Data Types

Declare variables and work with JavaScript's primitive and reference types.

📄 var, let, and const 10 min 📄 Differences Between var, let, and const 10 min 📄 Primitive Types Overview 10 min 📄 Strings 10 min 📄 Numbers 10 min 📄 Booleans 10 min 📄 null and undefined 10 min 📄 Symbol 10 min 📄 BigInt 10 min 📄 Basic Objects and Arrays 10 min 📄 Type Conversion and Coercion 10 min

Module 3 Operators

Use arithmetic, logical, bitwise, and comparison operators in JavaScript.

📄 Arithmetic Operators 10 min 📄 Logical Operators 10 min 📄 Bitwise Operators 10 min 📄 Comparison Operators 10 min 📄 == vs === 10 min

Module 4 Control Flow

Control the execution of your programs with loops and branching statements.

📄 if / else 10 min 📄 for Loops 10 min 📄 while Loops 10 min 📄 switch Statement 10 min 📄 break and continue 10 min

Module 5 Conditionals

Write expressive conditional logic with operators and modern syntax.

📄 Ternary Operator 10 min 📄 Truthy and Falsy Values 10 min 📄 Logical Short-Circuiting 10 min 📄 Nullish Coalescing 10 min 📄 Optional Chaining 10 min

Module 6 Functions

Define and use functions, the core building block of JavaScript.

📄 Declarations vs Expressions 10 min 📄 Parameters and Return Values 10 min 📄 Default Parameters 10 min 📄 Rest Parameters 10 min 📄 Immediately Invoked Function Expressions (IIFE) 10 min

Module 7 Scope and Closures

Understand scope, hoisting, closures, and higher-order functions.

📄 Global vs Function Scope 10 min 📄 Block Scope 10 min 📄 Hoisting 10 min 📄 Closures 10 min 📄 Closure Scope 10 min 📄 Higher-Order Functions 10 min 📄 Functions as Arguments 10 min 📄 Functions as Return Values 10 min

Module 8 Arrays

Store collections of data and transform them with built-in array methods.

📄 Array Basics 10 min 📄 forEach 10 min 📄 map 10 min 📄 filter 10 min 📄 reduce 10 min 📄 find 10 min 📄 some and every 10 min 📄 sort 10 min 📄 reverse 10 min 📄 flat and flatMap 10 min 📄 includes 10 min 📄 entries 10 min

Module 9 Objects

Work with key-value data using objects, their methods, and JSON.

📄 Object Basics 10 min 📄 Properties and Methods 10 min 📄 Object.keys, values, and entries 10 min 📄 Working with JSON 10 min

Module 10 The this Keyword

Master how this is determined and how to control execution context.

📄 Understanding this 10 min 📄 Context Binding 10 min 📄 bind() 10 min 📄 call() 10 min 📄 apply() 10 min

Module 11 ES6+ Features

Write modern JavaScript with arrow functions, destructuring, and more.

📄 What Are ES6+ Features? 10 min 📄 Arrow Functions 10 min 📄 Template Literals 10 min 📄 Destructuring 10 min 📄 Spread Operator 10 min 📄 Rest Operator 10 min

Module 12 Modules

Organize code into reusable modules using import and export.

📄 Introduction to Modules 10 min 📄 import / export Syntax 10 min 📄 Default vs Named Exports 10 min 📄 Writing Modular Code 10 min

Module 13 Classes and Inheritance

Use ES6 classes, inheritance, and static members for object-oriented code.

📄 Class Syntax 10 min 📄 Constructors 10 min 📄 Methods 10 min 📄 Inheritance with extends 10 min 📄 Static Methods 10 min 📄 Getters and Setters 10 min

Module 14 Prototypes and Inheritance

Understand JavaScript's prototype chain and prototypal inheritance.

📄 The Prototype Chain 10 min 📄 Object.create() 10 min 📄 __proto__ 10 min 📄 Prototypal Inheritance 10 min

Module 15 Error Handling

Handle and create errors gracefully to build robust applications.

📄 try / catch Blocks 10 min 📄 The finally Block 10 min 📄 Throwing Errors 10 min 📄 Error Types 10 min 📄 Custom Errors 10 min

Module 16 Asynchronous Programming

Handle non-blocking operations with callbacks and async/await.

📄 Synchronous vs Asynchronous 10 min 📄 Callbacks 10 min 📄 Callback Hell 10 min 📄 async / await 10 min 📄 Error Handling with catch 10 min

Module 17 Promises

Manage asynchronous results with promises and chaining.

📄 Introduction to Promises 10 min 📄 Creating a Promise 10 min 📄 then, catch, and finally 10 min 📄 Promise Chaining 10 min 📄 Promise.all, race, allSettled, and any 10 min

Module 18 The Event Loop

Understand how the JavaScript engine schedules and runs your code.

📄 JavaScript Engine and Runtime 10 min 📄 The Call Stack 10 min 📄 Microtasks 10 min 📄 Macrotasks 10 min 📄 Concurrency Model 10 min

Module 19 APIs and Fetch

Communicate with REST APIs using fetch and handle CORS.

📄 Using fetch 10 min 📄 Interacting with REST APIs 10 min 📄 Handling JSON 10 min 📄 What Is CORS? 10 min 📄 Why CORS Exists 10 min 📄 Solving CORS Errors 10 min

Module 20 Functional Programming

Apply functional programming principles to write predictable code.

📄 Pure Functions 10 min 📄 Immutability 10 min 📄 Currying 10 min 📄 Function Composition 10 min

Module 21 Advanced Asynchronous Patterns

Explore generators, async iterators, and observables.

📄 Generators 10 min 📄 Async Iterators 10 min 📄 Observables (e.g. RxJS) 10 min

Module 22 Metaprogramming

Inspect and customize language behavior with proxies, reflect, and symbols.

📄 Proxies 10 min 📄 Reflect 10 min 📄 Symbols 10 min 📄 Iterators ([Symbol.iterator]) 10 min

Module 23 Memory Management

Understand garbage collection and avoid memory leaks.

📄 Garbage Collection 10 min 📄 Avoiding Memory Leaks 10 min 📄 Weak References (WeakMap) 10 min

Module 24 Performance Optimization

Make your JavaScript faster with proven optimization techniques.

📄 Memoization 10 min 📄 Lazy Loading 10 min 📄 Debouncing 10 min 📄 Throttling 10 min

Module 25 Security

Protect your applications from common web security threats.

📄 Preventing XSS 10 min 📄 Preventing CSRF 10 min 📄 Sanitizing Input 10 min

Module 26 Design Patterns

Solve common problems with established JavaScript design patterns.

📄 Module Pattern 10 min 📄 Factory Pattern 10 min 📄 Singleton Pattern 10 min 📄 Observer Pattern 10 min

Module 27 Debugging

Find and fix bugs efficiently using developer tools and techniques.

📄 Console Methods 10 min 📄 Browser DevTools 10 min 📄 Breakpoints and Stepping 10 min 📄 Debugging Common Errors 10 min

Module 28 Testing

Write tests to verify your code with popular testing frameworks.

📄 Types of Testing 10 min 📄 Unit Testing 10 min 📄 Integration Testing 10 min 📄 Jest 10 min 📄 Mocha 10 min

Module 29 Browser Environment

Manipulate the DOM and interact with the browser.

📄 The DOM 10 min 📄 Selecting Elements 10 min 📄 Creating Elements 10 min 📄 Modifying Elements 10 min 📄 Types of Selectors 10 min

Module 30 Events

Handle, propagate, and create browser events with full control.

📄 Event-Driven Programming 10 min 📄 Different Types of Events 10 min 📄 Event Handling 10 min 📄 addEventListener 10 min 📄 Click and Hover Handlers 10 min 📄 Custom Events 10 min 📄 Event Bubbling 10 min 📄 Event Capturing 10 min 📄 Event Delegation 10 min 📄 Event Methods (stopPropagation, stopImmediatePropagation, preventDefault) 10 min

Module 31 Node.js Environment

Run JavaScript outside the browser with Node.js.

📄 What Is Node.js? 10 min 📄 Running JavaScript with Node 10 min 📄 Modules in Node (CommonJS vs ESM) 10 min 📄 npm and Packages 10 min 📄 Working with the File System 10 min

Module 32 Project Based Learning

Apply everything you've learned by building a real project.

📄 Project Overview 10 min 📄 Planning Your Project 10 min 📄 Building the Project 10 min 📄 Deploying Your Project 10 min

Module 33 Interview Questions

Prepare for JavaScript interviews with common questions and challenges.

📄 Core Concepts Questions 10 min 📄 Coding Challenges 10 min 📄 Tricky Questions 10 min 📄 System Design Basics 10 min

Module 34 Certification

Complete the final assessment and earn your certificate.

📄 Final Assessment 10 min 📄 Getting Certified 10 min