Top 40+ JavaScript Interview Questions & Answers (With Notes) in Hindi | Freshers to Seniors (2025)

Top 40+ JavaScript Interview Questions & Answers (With Notes) in Hindi | Freshers to Seniors (2025)

[Prerequisite] Javascript :-    • JavaScript Mastery Course  

Complete React.JS :-    • React JS Complete Course in Hindi (2026) |...  

React.JS Interview Questions :-    • Top 30+ React JS Interview Questions & Ans...  

React.JS Portfolio Project :-    • Build React Animated Portfolio 2025 In Hin...  

React.js Project playlist :-    • React.js Projects (Beginner → Advanced) | ...  

Node.js playlist :-    • Node JS & Express Backend Development Full...  

Code :- https://github.com/sumanmalakar/JS_In...

Notes :- https://drive.google.com/drive/u/0/fo...

Donate Us | If our tutorials inspired you, please donate to help us create more amazing content :- https://drive.google.com/file/d/10GBJ...

TIMESTAMPS

1.) Basic Level:
00:00:00 | Intro
00:04:30 | What is JavaScript? How is it different from Java?
00:13:16 | Explain the difference between var, let, and const.
00:20:50 | What are the data types in JavaScript?
00:24:19 | What is hoisting in JavaScript?
00:28:46 | What are closures in JavaScript?
00:36:24 | What is the difference between == and === in JavaScript?
00:40:19 | Explain how this keyword works in JavaScript.
00:45:49 | What is an event in JavaScript? How do you prevent default behavior?
00:52:26 | What are arrow functions, and how are they different from regular functions?
00:58:00 | What is NaN in JavaScript? How do you check if a value is NaN?

2.) Intermediate Level:
01:00:30 | What is the difference between synchronous and asynchronous programming in JavaScript?
01:10:05 | Explain the concept of promises in JavaScript.
01:20:34 | What are callback functions? How are they used?
01:26:38 | What are JavaScript prototypes and how do they work?
01:33:22 | What is the event loop in JavaScript? How does it work with asynchronous code?
01:39:03 | Explain how map(), filter(), and reduce() functions work.
01:50:07 | What is the purpose of async and await in JavaScript?
01:57:13 | How does JavaScript handle memory management and garbage collection?
01:59:15 | What is the debounce function in JavaScript? How is it different from throttle?
02:14:17 | What is destructuring in JavaScript? Provide examples of array and object destructuring.

3.) Advanced Level:
02:19:23 | Explain the concept of event delegation in JavaScript.
02:27:51 | What are generators in JavaScript, and how do they differ from regular functions?
02:33:46 | What are JavaScript modules, and how do you use import and export?
02:45:20 | What is the Proxy object in JavaScript, and what are its use cases?
02:59:32 | Explain currying in JavaScript.
03:03:12 | What are the differences between deep cloning and shallow cloning in JavaScript? How would you implement both?
03:10:08 | What is memoization, and how would you implement it in JavaScript?
03:18:04 | Explain the concept of weak maps and weak sets in JavaScript.
03:27:20 | What is the difference between function declarations and function expressions?
03:30:52 | What is a JavaScript Symbol, and when would you use it?
03:36:47 | How does the apply, call, and bind methods work in JavaScript? Provide examples.
03:45:48 | What is the purpose of the async iterator, and how does it differ from a regular iterator?
03:48:48 | How can you prevent object mutation in JavaScript?
03:52:28 | DSA Coding Question's In JavaScript

Join Our WhatsApp Channel :- https://whatsapp.com/channel/0029VabO...

►My Girlfriend :- https://amzn.to/3EvmSkD

Official Instagram Page :-   / webdevmastery18  

Reach Me Out
-----------------------------------------------------------------------------------------------------------------------
Linkedin :-   / suman-malakar  
Instagram :-   / suman_malakar001  
facebook :-   / sumankumar.malakar.9  
GitHub :- https://github.com/sumanmalakar
-----------------------------------------------------------------------------------------------------------------------

Product I use for coding and YouTube
-----------------------------------------------------------------------------------------------------------------------
Laptop :- https://amzn.to/45tbotk
SSD :- https://amzn.to/47NUp7c
HardDisk :- https://amzn.to/3KGSaZ9
keyboard :- https://amzn.to/3YGXIJ3
Mouse :- https://amzn.to/45uSylF
Headphone :- https://amzn.to/3KGSaZ9
Web Cam :- https://amzn.to/3QK978T
Microphone : - https://amzn.to/3KGSaZ9

Business Email: malakars041@gmail.com

Personal Channel:    / @sumanmalakar18  

#react #nodejs #nodejstutorial #node #javascript #javascripttutorial