Progress Bar is one of the most deceptively tricky machine coding questions.
It’s asked at Google, Uber, Meta and Razorpay — and most candidates fail the follow-up.
Swipe to learn:
âś… useState + clamp logic
âś… Dynamic color change
âś… Accessibility (the senior signal)
✅ Uber’s concurrent bars follow-up
Save this before your next interview đź”–
đź’¬ Comment MACHINE to get my Frontend Interview Course link
(20+ machine coding questions, full walkthroughs)
#reactjs #javascript #frontend
Infinite Scroll appears in 40% of frontend machine coding rounds at Indian startups like Zepto, CRED, Meesho & PhonePe.
Most developers reach for scroll events. Interviewers notice.
Here’s the right way — IntersectionObserver, clean state, no performance issues 👆
Covers:
âś… Why scroll events fail
âś… IntersectionObserver setup
âś… Fetch + append pattern
âś… Memory leak prevention
âś… Senior-level follow-ups
**Save this before your next interview đź”–**
Want the full machine coding breakdown? My Frontend Interview Course — “Roadside to Dream Job” — covers Infinite Scroll and 20+ more problems asked at Zepto, CRED, PhonePe, Meesho & more.
💬 Comment “Interview” for the course link
Truncated Pagination asked in frontend interviews at Flipkart, Swiggy & Razorpay 👇
Most devs render all page numbers and fail the follow-up questions.
Save this before your next interview đź”–
Want the complete solution with more questions?
💬 Comment “INTERVIEW” and I’ll DM you my complete Course
Never written a React test? This carousel is for you.
Most devs skip testing because it looks scary.
It’s not. You just need the right starting point.
In this carousel:
âś… What to install (3 packages)
âś… How render and screen work
âś… Which queries to use and when
âś… Testing a real user click
âś… Running your first test
React Testing Library + Vitest.
Beginner friendly. No fluff.
🎬 Full FREE course on YouTube
Comment “test” and I’ll send the link 👇
đź’ľ Save this before your next project
Your React instincts will betray you in Next.js.
Most React devs jump into Next.js and bring all their old habits with them, `useEffect` for data, `’use client’` on everything, React Router in the codebase.
These 5 mistakes cost you performance, SEO, and hours of debugging.
Swipe through, fix them today.
Comment **NEXT** for my free Next.js project tutorial on YouTube
#nextjs #reactjs #javascript #webdevelopment #frontend
Add subscriptions to your Next.js app in less than a minute!
No custom UI. No manual Stripe setup. Just drop in <PricingTable /> and gate features with has().
Comment “clerk” and I’ll send you the link.
React devs who skip testing are the first to get filtered in 2026 interviews.
Here’s unit testing with RTL + Vitest in 9 beginner-friendly slides.
What’s inside:
âś… What unit testing actually is
✅ RTL vs Vitest — what each does
âś… How to write your first test
âś… Querying elements the right way
âś… Simulating clicks & async flows
âś… Mocking APIs without hitting real endpoints
Full React Testing course is FREE on YouTube.
Comment “test” and I’ll DM you the link 👇
#reactjs #frontend #webdevelopment #javascript
