Complete JavaScript & React Learning Path

Master modern web and mobile development with this comprehensive guide to JavaScript, React, and React Native

Interview Preparation Practice JavaScript

JavaScript Core Topics

JS

Fundamentals

  • Variables: var, let, const
  • Primitive vs Reference Types
  • Type Conversion & Coercion
  • Operators & Expressions
  • Control Structures
JavaScript fundamentals form the building blocks for all web development. Understanding scope, hoisting, and the temporal dead zone is crucial for writing predictable code.
ƒ

Functions

  • Function Declarations vs Expressions
  • Arrow Functions
  • Higher-Order Functions
  • Closures & Lexical Scope
  • IIFEs & Module Pattern
  • Currying & Partial Application
Functions are first-class citizens in JavaScript. Mastering closures enables powerful patterns like memoization and helps manage state in functional programming.
{ }

Objects & Prototypes

  • Object Creation Patterns
  • Prototypal Inheritance
  • ES6 Classes
  • this Keyword (binding rules)
  • Property Descriptors
  • Proxy & Reflect API
JavaScript's prototype system is fundamentally different from classical inheritance. Understanding prototypes is key to effective object composition and inheritance.
⏳

Asynchronous JavaScript

  • Callbacks & Callback Hell
  • Promises & Promise Chaining
  • Async/Await Syntax
  • Event Loop & Concurrency
  • Microtasks vs Macrotasks
  • Web Workers
JavaScript's single-threaded nature makes understanding asynchronous patterns crucial for building responsive applications without blocking the main thread.
ES6+

ES6+ Features

  • Destructuring Assignment
  • Spread/Rest Operators
  • Modules (ESM)
  • Optional Chaining
  • Nullish Coalescing
  • Symbols & Iterators
  • Generators
Modern JavaScript includes powerful features that enable more expressive and concise code while solving common pain points from earlier versions.
★

Advanced Patterns

  • Functional Programming
  • Reactive Programming (RxJS)
  • Design Patterns in JS
  • Memory Management
  • Performance Optimization
  • WebAssembly Integration
Advanced patterns help solve complex problems efficiently and are particularly valuable in large-scale applications and frameworks.

React JS Topics

⚛

Core Concepts

  • Component Architecture
  • JSX Deep Dive
  • Props & PropTypes
  • State Management
  • Component Lifecycle
  • Virtual DOM
Understanding React's core principles is essential before diving into advanced patterns. The virtual DOM and reconciliation algorithm are key to React's performance.
🎣

Hooks System

  • useState & useEffect
  • useContext & useReducer
  • useMemo & useCallback
  • useRef & useImperativeHandle
  • Custom Hooks
  • Hook Rules & Best Practices
Hooks revolutionized React by enabling stateful logic in functional components. They provide a more direct API to React concepts without classes.
🧩

Advanced Patterns

  • Compound Components
  • Render Props
  • Higher-Order Components
  • Context API
  • Error Boundaries
  • Portals
  • React.memo
These patterns help create more flexible and maintainable component APIs, especially useful for component libraries and complex UIs.
⚡

Performance Optimization

  • Code Splitting
  • Lazy Loading
  • Memoization Techniques
  • Windowing/Virtualization
  • React Profiler
  • Concurrent Mode
  • Suspense
Performance optimization in React requires understanding both React-specific techniques and general web performance best practices.
🧰

Ecosystem & Tools

  • React Router
  • State Management (Redux, MobX)
  • Server-Side Rendering
  • Static Site Generation
  • Testing (Jest, React Testing Library)
  • TypeScript with React
  • Styling Solutions
The React ecosystem is vast. Choosing the right tools depends on your application's requirements and scale.
18+

React 18+ Features

  • Automatic Batching
  • Transitions
  • New Suspense Features
  • Streaming SSR
  • New Hooks (useId, useSyncExternalStore)
  • Concurrent Rendering
React 18 introduces groundbreaking features that enable better user experiences through concurrent rendering capabilities.

React Native Topics

📱

Fundamentals

  • Core Components
  • Styling & Flexbox
  • Handling Touches
  • Platform-Specific Code
  • Debugging Techniques
  • Performance Basics
React Native brings React's declarative UI framework to mobile platforms while maintaining native performance characteristics.
🧭

Navigation

  • React Navigation
  • Stack Navigator
  • Tab Navigator
  • Drawer Navigator
  • Deep Linking
  • Navigation State
  • Authentication Flows
Navigation is a critical part of mobile apps. React Navigation provides a comprehensive solution with gesture handling and animations.
📷

Device Features

  • Camera & Photos
  • Geolocation
  • Push Notifications
  • Biometrics
  • Bluetooth
  • Sensors
  • File System
Accessing native device capabilities is where React Native shines, bridging JavaScript with native platform APIs.
🚀

Performance

  • Native Modules
  • Hermes Engine
  • RAM Bundles
  • Memory Management
  • Threading
  • Profiling
  • Optimizing Lists
Mobile performance requires special attention to memory usage, thread management, and efficient rendering of complex lists.
🔄

State Management

  • Context API
  • Redux & Redux Toolkit
  • MobX
  • React Query
  • Zustand
  • Offline-First
  • Data Persistence
Choosing the right state management solution depends on your app's complexity and data synchronization requirements.
🎨

Advanced Topics

  • Animation (Reanimated)
  • Gesture Handling
  • Native Components
  • Code Push & OTA Updates
  • Testing & CI/CD
  • Security Best Practices
  • Cross-Platform Strategies
Advanced React Native development involves creating smooth animations, custom native components, and robust deployment pipelines.

Interview Preparation

JavaScript Interview Questions

  • Closures and Scope
  • Event Loop Questions
  • Prototypal Inheritance
  • Hoisting and TDZ
  • Async Patterns
  • Memory Management

React Interview Questions

  • Virtual DOM Differences
  • Hooks Deep Dive
  • Performance Optimization
  • State Management
  • Component Lifecycle
  • Error Handling

System Design & Architecture

  • Component Structure
  • State Management
  • API Integration
  • Performance Considerations
  • Testing Strategies
  • Security Practices

Coding Challenges

  • Algorithm Problems
  • Data Structures
  • DOM Manipulation
  • Async Problems
  • React Component Challenges
  • Real-world Scenarios

Behavioral Questions

  • Project Experience
  • Team Collaboration
  • Problem Solving
  • Technical Decisions
  • Learning Process
  • Career Goals

Mock Interviews

  • Technical Screening
  • System Design
  • Pair Programming
  • Take-home Assignments
  • Code Review
  • Feedback Analysis

Practice Projects

Beginner Projects

  • To-Do Application
  • Weather App
  • Calculator
  • Quiz App
  • Recipe Finder
  • Budget Tracker

Intermediate Projects

  • E-commerce Site
  • Social Media Dashboard
  • Real-time Chat
  • Job Board
  • Blog Platform
  • Music Player

Advanced Projects

  • Full-stack Applications
  • Progressive Web Apps
  • Micro-frontends
  • Real-time Collaboration
  • Data Visualization
  • Custom Hooks Library

React Native Projects

  • Fitness Tracker
  • Food Delivery App
  • Travel Planner
  • Photo Sharing App
  • Language Learning
  • AR Experiences

Open Source Contribution

  • Finding Projects
  • First Contributions
  • Documentation
  • Bug Fixing
  • Feature Development
  • Community Engagement

Portfolio Projects

  • Personal Website
  • Showcase Applications
  • Technical Blog
  • Case Studies
  • Code Samples
  • Demo Videos