JavaScript

JavaScript

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Section 1: Getting Started

6Lessons ·
- 1: JavaScript in the Browser and Node.js
  
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- 2: Setting Up a Development Environment
  
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- 3: Using the Browser Console and DevTools
  
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- 4: Linking and Loading Scripts on a Page
  
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- 5: History and Evolution of JavaScript (ES1-ES2025)
  
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- 6: How JavaScript Engines Work: V8 Overview
  
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Section 2: Core Syntax and Types

10Lessons ·
- 7: Variables: var, let, and const
  
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- 8: Primitive Types Explained
  
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- 9: Type Coercion Rules
  
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- 10: Strict Equality vs Loose Equality
  
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- 11: Operators and Expressions
  
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- 12: Operator Precedence
  
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- 13: Template Literals
  
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- 14: Tagged Templates
  
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- 15: typeof and instanceof
  
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- 16: Practice Exercise: Type Coercion Puzzles
  
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Section 3: Strings and Numbers in Depth

6Lessons ·
- 17: String Methods: slice, substring, split
  
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- 18: String Methods: includes, startsWith, endsWith
  
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- 19: String Methods: padStart, padEnd, trim
  
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- 20: Number Methods and Precision Issues
  
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- 21: The Intl API for Formatting Numbers and Dates
  
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- 22: Practice Exercise: Building a Text Formatter Utility
  
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Section 4: Control Flow

5Lessons ·
- 23: Conditional Statements
  
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- 24: Loops: for, while, for...of, for...in
  
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- 25: Switch Statements
  
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- 26: Labeled Statements and Loop Control
  
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- 27: Practice Exercise: Building a Number Guessing Game
  
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Section 5: Functions

11Lessons ·
- 28: Function Declarations vs Expressions
  
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- 29: Arrow Functions
  
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- 30: Default and Rest Parameters
  
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- 31: Closures Explained
  
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- 32: The this Keyword in Depth
  
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- 33: call, apply, and bind
  
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- 34: Immediately Invoked Function Expressions
  
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- 35: Recursion in JavaScript
  
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- 36: Higher-Order Functions
  
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- 37: Function Currying
  
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- 38: Practice Exercise: Building a Debounce and Throttle Utility
  
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Section 6: Objects and Arrays

12Lessons ·
- 39: Object Literals and Property Access
  
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- 40: Property Descriptors and Getters/Setters
  
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- 41: Destructuring Objects and Arrays
  
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- 42: Spread and Rest Syntax
  
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- 43: Array Methods: map, filter, reduce
  
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- 44: Array Methods: find, some, every
  
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- 45: Array Methods: flat and flatMap
  
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- 46: Sorting and Comparing Arrays
  
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- 47: Working with JSON
  
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- 48: Object.freeze and Immutability Patterns
  
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- 49: Structured Clone and Deep Copying
  
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- 50: Practice Exercise: Building a Shopping Cart with Array Methods
  
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Section 7: Maps, Sets, and Symbols

4Lessons ·
- 51: The Map Object
  
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- 52: The Set Object
  
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- 53: WeakMap and WeakSet
  
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- 54: Symbols and Their Use Cases
  
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Section 8: Asynchronous JavaScript

13Lessons ·
- 55: The Event Loop Explained
  
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- 56: The Call Stack and Task Queue
  
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- 57: Microtasks vs Macrotasks
  
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- 58: Callbacks and Callback Hell
  
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- 59: Promises in Depth
  
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- 60: Promise Chaining
  
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- 61: Promise.all, allSettled, race, and any
  
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- 62: Async/Await
  
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- 63: Error Handling in Async Code
  
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- 64: Fetching Data with the Fetch API
  
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- 65: AbortController for Cancelling Requests
  
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- 66: Async Iterators and for-await-of
  
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- 67: Practice Exercise: Building a Retry Wrapper for Fetch Calls
  
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Section 9: Object-Oriented and Prototypes

9Lessons ·
- 68: Prototypal Inheritance Explained
  
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- 69: The Prototype Chain
  
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- 70: Constructor Functions
  
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- 71: ES6 Classes
  
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- 72: Static and Private Class Members
  
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- 73: Getters and Setters in Classes
  
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- 74: Mixins and Composition
  
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- 75: Class Inheritance with extends and super
  
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- 76: Practice Exercise: Building a Class Hierarchy for Shapes
  
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Section 10: The DOM

11Lessons ·
- 77: The DOM Tree Explained
  
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- 78: Selecting and Traversing DOM Elements
  
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- 79: Manipulating Content and Attributes
  
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- 80: Creating and Removing Elements
  
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- 81: Handling Events
  
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- 82: Event Delegation
  
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- 83: Event Bubbling and Capturing
  
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- 84: Working with Forms and Validation
  
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- 85: The MutationObserver API
  
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- 86: Working with the Intersection Observer API
  
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- 87: Practice Exercise: Building a Dynamic Table Renderer
  
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Section 11: Browser APIs

11Lessons ·
- 88: Web Storage: localStorage and sessionStorage
  
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- 89: Working with Cookies from JavaScript
  
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- 90: The History API
  
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- 91: Geolocation API
  
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- 92: The Clipboard API
  
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- 93: Web Workers for Background Processing
  
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- 94: The Notification API
  
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- 95: The Canvas API for 2D Drawing
  
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- 96: Drawing Shapes and Animations with Canvas
  
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- 97: The Drag and Drop API
  
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- 98: The File API for Reading Local Files
  
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Section 12: Modern JavaScript (ES2015-ES2025)

10Lessons ·
- 99: Let, Const, and Block Scoping Revisited
  
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- 100: Optional Chaining and Nullish Coalescing
  
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- 101: Modules: import and export
  
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- 102: Dynamic Imports
  
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- 103: Top-Level Await
  
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- 104: Numeric Separators and BigInt
  
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- 105: Array and Object New Methods by Version
  
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- 106: The Temporal API for Dates
  
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- 107: Well-Known Symbols and Iterables Protocol
  
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- 108: Generators and Iterators in JavaScript
  
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Section 13: Functional Programming Patterns

6Lessons ·
- 109: Pure Functions and Immutability
  
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- 110: Function Composition
  
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- 111: Partial Application
  
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- 112: Memoization Techniques
  
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- 113: Declarative vs Imperative Style
  
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- 114: Practice Exercise: Building a Pipe/Compose Utility
  
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Section 14: Error Handling and Debugging

6Lessons ·
- 115: Try/Catch and Custom Error Classes
  
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- 116: The Error Object and Stack Traces
  
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- 117: Debugging with Breakpoints and Watch Expressions
  
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- 118: Common JavaScript Pitfalls and Gotchas
  
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- 119: Defensive Programming Techniques
  
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- 120: Debugging Memory Issues in DevTools
  
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Section 15: Testing

8Lessons ·
- 121: Unit Testing with Jest
  
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- 122: Mocking and Spies
  
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- 123: Testing Asynchronous Code
  
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- 124: Snapshot Testing
  
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- 125: Test-Driven Development Basics in JavaScript
  
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- 126: Testing with Vitest
  
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- 127: End-to-End Testing with Playwright or Cypress
  
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- 128: Code Coverage Reporting
  
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Section 16: Accessibility for JavaScript Developers

3Lessons ·
- 129: ARIA Roles and Live Regions in Dynamic UIs
  
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- 130: Managing Focus in JavaScript Applications
  
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- 131: Keyboard Navigation for Custom Widgets
  
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Section 17: Internationalization and Localization

3Lessons ·
- 132: Structuring Translatable Strings
  
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- 133: Using the Intl API for Pluralization
  
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- 134: Handling RTL Layouts in JavaScript Apps
  
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Section 18: Performance

7Lessons ·
- 135: Understanding Reflow and Repaint
  
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- 136: Debouncing and Throttling
  
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- 137: Memory Leaks and How to Avoid Them
  
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- 138: Lazy Loading and Code Splitting Basics
  
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- 139: Optimizing Loops and Large Data Processing
  
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- 140: Using requestAnimationFrame Effectively
  
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- 141: Web Vitals and Measuring Real Performance
  
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Section 19: Node.js Fundamentals

8Lessons ·
- 142: Running JavaScript Outside the Browser
  
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- 143: The Node.js Event Loop vs the Browser's
  
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- 144: Modules with CommonJS and ESM
  
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- 145: Working with npm Packages
  
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- 146: Reading and Writing Files in Node
  
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- 147: Building a Basic CLI Tool with Node
  
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- 148: Environment Variables in Node
  
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- 149: Streams in Node.js
  
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Section 20: Regular Expressions

6Lessons ·
- 150: Regex Syntax in JavaScript
  
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- 151: Groups, Flags, and Global Matching
  
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- 152: Lookahead and Lookbehind in JS Regex
  
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- 153: Using Regex with String Methods
  
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- 154: Common Regex Patterns for Validation
  
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- 155: Practice Exercise: Building a Form Validation Library
  
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Section 21: Design Patterns in JavaScript

7Lessons ·
- 156: The Module Pattern
  
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- 157: The Singleton Pattern
  
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- 158: The Observer Pattern (Pub/Sub)
  
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- 159: The Factory Pattern
  
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- 160: The Revealing Module Pattern
  
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- 161: The Command Pattern
  
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- 162: The Strategy Pattern
  
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Section 22: Security Basics

5Lessons ·
- 163: Avoiding Cross-Site Scripting in Client Code
  
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- 164: Content Security Policy Basics
  
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- 165: Safe Handling of User Input
  
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- 166: Understanding Same-Origin Policy and CORS
  
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- 167: Secure Storage of Tokens in the Browser
  
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Section 23: Data Structures and Algorithms in JavaScript

12Lessons ·
- 168: Implementing a Linked List in JavaScript
  
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- 169: Implementing a Doubly Linked List
  
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- 170: Implementing a Stack and Queue
  
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- 171: Implementing a Binary Search Tree
  
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- 172: Implementing a Hash Table
  
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- 173: Implementing a Graph and BFS/DFS
  
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- 174: Implementing a Trie
  
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- 175: Implementing a Min-Heap
  
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- 176: Implementing Common Sorting Algorithms
  
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- 177: Implementing Binary Search
  
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- 178: Dynamic Programming Patterns in JavaScript
  
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- 179: Big-O Notation with JavaScript Examples
  
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Section 24: Practical Projects

14Lessons ·
- 180: Building an Interactive To-Do List
  
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- 181: Building a Simple Quiz Application
  
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- 182: Building a Debounced Search Autocomplete
  
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- 183: Building a Client-Side Form Validator
  
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- 184: Building a Simple Drag-and-Drop Interface
  
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- 185: Building a Countdown Timer App
  
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- 186: Building a Basic Weather Widget Using an API
  
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- 187: Building a Memory Card Matching Game
  
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- 188: Building a Simple Expense Tracker with localStorage
  
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- 189: Building a Pomodoro Timer
  
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- 190: Building an Image Carousel/Slider
  
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- 191: Building a Simple Calculator UI
  
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- 192: Building a Kanban Board with Drag and Drop
  
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- 193: Building a Real-Time Clock and Alarm App
  
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Section 25: More Advanced Async Patterns

5Lessons ·
- 194: Building a Simple Promise Implementation from Scratch
  
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- 195: Queueing and Rate-Limiting Async Operations
  
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- 196: Cancellable Async Workflows
  
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- 197: Async Generators for Streaming Data
  
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- 198: Practice Exercise: Building a Simple Task Queue with Concurrency Limits
  
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Section 26: More Object and Class Practice

4Lessons ·
- 199: Practice Exercise: Building an Observable Object with Proxies
  
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- 200: The Proxy and Reflect APIs
  
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- 201: Practice Exercise: Implementing a Simple Event Emitter Class
  
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- 202: Practice Exercise: Building a Simple State Machine
  
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Section 27: Working with Dates and Internationalization

4Lessons ·
- 203: The Date Object in Depth
  
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- 204: Formatting Dates with Intl.DateTimeFormat
  
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- 205: Working with Relative Time Formatting
  
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- 206: Locale-Aware Sorting and Comparison
  
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Section 28: Web Components

4Lessons ·
- 207: Custom Elements Basics
  
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- 208: The Shadow DOM
  
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- 209: HTML Templates and Slots
  
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- 210: Building a Reusable Web Component
  
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Section 29: More DOM and Browser Practice

5Lessons ·
- 211: Working with the Fetch API and Streaming Responses
  
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- 212: The Resize Observer API
  
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- 213: The Fullscreen API
  
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- 214: The Page Visibility API
  
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- 215: Practice Exercise: Building an Infinite Scroll List
  
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Section 30: Build Tooling for Vanilla JavaScript

5Lessons ·
- 216: Understanding Babel and Transpilation
  
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- 217: Bundling with Webpack or Vite Basics
  
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- 218: Linting with ESLint
  
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- 219: Formatting with Prettier
  
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- 220: Source Maps Explained
  
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Section 31: More Practice Projects

6Lessons ·
- 221: Building a Recipe Finder App Using a Public API
  
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- 222: Building a Markdown Previewer
  
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- 223: Building a Simple Chat UI with WebSockets
  
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- 224: Building a Password Strength Meter
  
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- 225: Building a Custom Video Player Interface
  
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- 226: Building a Simple Whiteboard/Drawing App with Canvas
  
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Section 32: Interview and Algorithm Practice

8Lessons ·
- 227: Implementing Array and String Algorithms in JavaScript
  
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- 228: Implementing a Debounce and Throttle from Scratch
  
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- 229: Common JavaScript Interview Questions on Closures and this
  
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- 230: Common JavaScript Interview Questions on Prototypes
  
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- 231: Common JavaScript Interview Questions on Async Code
  
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- 232: Solving Common Coding Challenges in JavaScript
  
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- 233: Whiteboard Practice: Two-Pointer Techniques
  
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- 234: Mock Coding Interview Walkthrough in JavaScript
  
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Section 33: Error Objects (MDN Reference)

4Lessons ·
- 235: The Error Object Hierarchy: TypeError, RangeError, SyntaxError
  
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- 236: Creating Custom Error Subclasses
  
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- 237: AggregateError for Multiple Errors
  
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- 238: Error.cause for Error Chaining
  
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Section 34: TypedArrays and Binary Data

4Lessons ·
- 239: Introduction to TypedArrays
  
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- 240: Int8Array, Uint8Array, and Friends
  
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- 241: The ArrayBuffer and DataView Objects
  
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- 242: Working with Blob and File Objects
  
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Section 35: Reflection and Metaprogramming (MDN Reference)

3Lessons ·
- 243: The Reflect Object
  
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- 244: Advanced Proxy Traps
  
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- 245: Practice Exercise: Building a Validation Proxy
  
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Section 36: More Global Functions (MDN Reference)

5Lessons ·
- 246: encodeURIComponent and decodeURIComponent
  
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- 247: parseInt and parseFloat Edge Cases
  
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- 248: isNaN vs Number.isNaN
  
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- 249: globalThis Explained
  
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- 250: The structuredClone Global Function
  
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