React Machine Coding Challenges
Practice the most common React machine coding interview problems with live runnable demos and step-by-step implementation guides.
Each page includes:
- Problem statement
- Live demo (interactive app in the docs)
- What interviewers expect
- Step-by-step build plan
- Complete implementation (full copy-paste ready code)
- Final checklist
Quick Demo
Preview — Simple Counter
Count: 0
Recommended Order
| # | Challenge | Difficulty |
|---|---|---|
| 1 | Simple Counter | Warm-up |
| 2 | Button Toggle (ON/OFF) | Warm-up |
| 3 | Data List Rendering | Warm-up |
| 4 | Context API — Language Toggle | Core |
| 5 | Phone Book (Form + Sorted Table) | Core |
| 6 | Todo List (Basic) | Core |
| 7 | Todo App (Context + Reducer) | Core |
| 8 | Toggle with Context + Reducer | Core |
| 9 | Tic Tac Toe | Core |
| 10 | Star Rating | Core |
| 11 | Directory Tree | Core |
| 12 | Transfer List | Advanced |
| 13 | Transfer List (Advanced + Reorder) | Advanced |
| 14 | Autocomplete (Offline) | Advanced |
| 15 | Autocomplete (Online API) | Advanced |
| 16 | Dynamic Forms | Advanced |
| 17 | Shopping Cart + Coupons | Advanced |
| 18 | Async Posts List | Advanced |
How to Practice
- Read the problem statement.
- Try building it yourself in 30–45 minutes without looking.
- Compare with the live demo and steps.
- Rebuild next day from memory.