Top 150+ JavaScript Interview Questions – In One Powerful PDF
Structured, up-to-date JavaScript interview questions with clear answers, designed to help you crack frontend & JS interviews faster – without getting lost in random blogs and YouTube videos.
- ✓Curated questions from real interview patterns
- ✓Covers fundamentals to advanced topics
- ✓Perfect for freshers & 1–4 year experienced devs
- ✓Ready-to-revise format before the interview
Built for Serious JavaScript Interview Prep
Perfect for you if you are…
- •A fresher preparing for your first frontend/JS role
- •A 1–4 year experienced developer switching companies
- •Someone who knows JavaScript basics but is unsure what interviewers actually ask
- •Tired of unstructured YouTube videos and random question lists
This PDF will help you to…
- •Quickly revise core JS concepts before interviews
- •Practice real-style questions with focused answers
- •Gain confidence in both theory and practical questions
- •Avoid blank moments when the interviewer goes deep into JS details
What's Inside
Every question is paired with a clear, concise answer – no fluff, no over-complication.
JavaScript Basics
Variables, data types, operators, conditionals, loops.
Functions & Scope
Function declarations, expressions, arrow functions, hoisting, scope chain.
Arrays & Objects
Common methods, cloning, immutability, iteration patterns.
Asynchronous JavaScript
Callbacks, Promises, async/await, event loop basics.
DOM & Browser APIs
Querying, manipulating the DOM, events, localStorage, etc.
ES6+ Features
let/const, spread, rest, destructuring, classes, modules.
Closures & Advanced Concepts
Closures, higher-order functions, currying, IIFE.
Error Handling
try/catch, error objects, promise error handling.
Performance & Optimization
Debouncing, throttling, common performance pitfalls.
Tricky & Practical Questions
Real-world style questions that interviewers use to test depth.
Why This PDF Actually Helps You Crack Interviews
Structured, Not Scattered
All questions are grouped by topic so you revise logically.
Interview-Focused, Not Theoretical Only
Questions picked from actual interview patterns, not just textbook stuff.
Concise, Clear Answers
No 5-page explanations – just enough depth to impress the interviewer.
One PDF You Can Revise Again & Again
Use it as your go-to revision file before every interview.
Get a Glimpse Inside
A clean, scroll-friendly layout that makes revision fast and stress-free.
150+ questions. Multiple angles. One focused PDF.
How Developers Feel After Using This
"Gave me clarity on what to revise. The structured format made it so much easier than jumping between random blog posts. I felt way more confident going into my interview."
"Much better than scattered YouTube playlists. Having everything in one PDF that I could quickly reference before the interview was a game-changer. The answers are concise and to the point."
"Helped me feel confident going into the interview. The questions covered exactly what interviewers asked, and the answers were clear without being overwhelming. Worth every rupee."
Get Instant Access for Just ₹199
One-time payment. Lifetime access to the PDF. No subscriptions, no upsells.
- ✓150+ curated JavaScript interview questions with answers
- ✓Structured by topic for focused revision
- ✓Instant digital download (PDF)
- ✓Read on any device
Have a question before buying? Contact us.
If you genuinely feel this doesn't help your prep, reach out within 7 days – we'll do our best to make it right.
Frequently Asked Questions
About 10tracker
10tracker creates focused, practical learning resources that help students and developers prepare smarter, not harder. This JavaScript interview PDF is built by developers who have been on both sides of the interview table, and know what actually gets asked.
No fluff. Just what you need to show up confident in your next JS interview.