React.js Development
Building the interactive web. React is a JavaScript library used to build fast, interactive user interfaces by composing reusable, stateful components. Master the component-driven architecture that powers modern, high-performance user interfaces.
The Component Model
React is all about reusable components. Instead of refreshing the whole page, React efficiently updates only the specific UI sections that need to change.
- 📦 Props: Passing data from parent to child components to keep UI dynamic.
- ⚙️ State: Managing internal data that changes over time (e.g., form inputs or toggle switches).
- ⚡ Hooks: Functions that let you "hook into" React state and lifecycle features from functional components.
Essential Hooks Hierarchy
"Master these in order of importance for interviews:"
1. useState, useEffect, useContext (Foundational)
2. useMemo, useCallback (Optimization)
3. useRef, useReducer (Advanced Logic)
JavaScript Fundamentals for React
| JS Concept | Why it matters in React |
|---|---|
| Arrays & Map | Essential for rendering lists of items and modifying data structures. |
| Async / Await | Crucial for fetching data from APIs without freezing the UI. |
| Arrow Functions | The standard syntax for writing functional components and event handlers. |
Technical Interview Focus
Interviews focus on your ability to handle data flow and performance. Expect questions on common use cases like fetching, loading, and modifying UI state.
1. Data Fetching & UI
Practice fetching data inside useEffect and managing loading/error states.
2. Performance Optimization
Learn how useMemo anduseCallback prevent unnecessary re-renders.
React Readiness Checklist
- ✅ Master Arrays: Be comfortable with .map(), .filter(), and .reduce().
- ✅ Explain Hooks: Be ready to explain why you use a specific hook.
- ✅ State Management: Understand how data flows from parent to child via props.
- ✅ Basic JS: Revisit W3Schools for syntax drills.
Ready to build with React?
Whether you are fetching data or optimizing components, we can help you prepare for your next frontend technical screen.
Book a Frontend Coaching Session