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Master JavaScript, React, and Next.js through structured learning, AI-evaluated practice sessions, and real-time feedback.

JavaScriptQuestion 2 of 5

What is a closure in JavaScript and how does it work?

A closure is a function that has access to variables from its outer scope even after the outer function has returned...

2 / 5

500+

Students Practicing

Actively preparing daily

150+

Curated Questions

Across all difficulty levels

3

Core Topics

JS, React & Next.js

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How it works

Four steps to interview confidence

No complicated setup. Pick your topic and start — PrepForge handles the rest.

Step 1

Pick Your Topic

Choose from JavaScript, React, or Next.js. Each topic has carefully curated questions covering beginner to advanced difficulty levels — all from real interviews.

Step 2

Learn or Jump In

Study the topic with full detailed answers in Learn Mode — or skip straight to a practice session. Your choice, your pace. No pressure.

Step 3

Practice with MCQ + Explanation

Answer each question with a multiple choice selection, then back it up with a written explanation — just like a real interview. Get feedback whenever you're ready.

Step 4

Get AI Feedback & Track Progress

Receive instant AI-powered scores, weak area detection, and personalized study recommendations. Every session is saved so you can track your growth over time.

Features

Everything you need to get hired

Built specifically for frontend developers targeting junior and mid-level roles.

Learn Mode

Browse all questions with full detailed answers. Bookmark important ones and build your knowledge base before jumping into practice.

Practice Sessions

Simulate real interview pressure. Answer MCQ + written explanation for each question — exactly how interviewers test you.

AI Feedback

Get instant detailed feedback — score per question, what you missed, and what the ideal answer should include. Brutal but honest.

Progress Tracking

Track your scores across multiple sessions. See how you improve over time with visual history and session logs.

Weak Area Detection

AI pinpoints exactly which concepts you struggle with — closures, hooks, routing — so you study smarter, not harder.

Session History

Every session is saved. Revisit past attempts, compare scores, and watch your understanding evolve over time.

Topics

Three topics. Hundreds of questions.

Curated from real interviews at top tech companies. Updated regularly.

JavaScript

Core JS

Fundamentals to advanced concepts

60 questions · 4 difficulty levels

What is the difference between var, let and const?

Explain event bubbling and capturing in detail

How does the JavaScript event loop work?

What are closures and why are they useful?

React

Hooks, state, and component patterns

50 questions · 4 difficulty levels

Explain useState vs useReducer — when to use which?

When would you use useCallback vs useMemo?

What are React Server Components?

How does React reconciliation work?

Next.js

App Router, SSR, and performance

45 questions · 4 difficulty levels

Difference between SSR, SSG, and ISR?

How does the App Router differ from Pages Router?

Explain Next.js middleware and its use cases

What are Server Actions and how do they work?

Testimonials

Students who got hired

Real feedback from developers who used PrepForge to land their first frontend role.

PrepForge's AI feedback was brutal but honest. It showed me exactly where my explanations were weak. Got my first offer after 3 weeks of consistent practice.

Arjun Kumar

Junior Dev @ Razorpay

The Learn Mode is underrated. I studied all the Next.js questions first, then practiced. Way better than watching the same YouTube video for the 10th time.

Sneha Rao

Frontend Dev @ Swiggy

Weak area detection is a game changer. Didn't even know I was struggling with closures until PrepForge flagged it 4 sessions in a row. Fixed it in a week.

Mohammed Hassan

React Dev @ Zoho