Rdj kashyap

Backend Dev @ YesDomain
Coding Rounds Cleared: HackWithInfy, TCS NQT, TCS HackQuest, Amazon, Tudip

Preparing for Infosys Off-Campus 2026 🔥

DSA | MERN | Logic

[Rdj kashyap @coderdjkashyap]

Consistency + Hard Work = Results 🚀

While working on my #100DaysOfCode DSA challenge, I’m excited to share that I secured 🥉 3rd Prize in Best Project Presentation at LNCT Group of Colleges.

Every day, solving problems, building projects, and improving step by step.

📌 Today’s DSA problem, solution, and output are in the image below.

#DSA #DeveloperJourney #Coding #ProjectPresentation

[Rdj kashyap @coderdjkashyap]

TCS NQT 2026 Aspirants — Follow me 🔥

I share:
• Most asked JS Interview Questions
• Problem → Solution threads
• OOP concepts with real examples
• Motivation for low percentage students

Strong coding + logic > 60% marks

Drop 🖐️ + your @ if you’re preparing
I’ll follow back everyone who replies!

Who’s in? 👇

[Rdj kashyap @coderdjkashyap]

JS Interview Question for Backend/Frontend devs 💻

Q: Explain Event Loop in JavaScript?

A:
JS is single-threaded. Event Loop handles async operations.
- Call Stack executes sync code
- Web APIs handle async (setTimeout, fetch)
- Callback Queue waits
- Event Loop pushes callbacks to stack when empty

This is why JS is non-blocking 🚀

Understand this? Drop 🔥

[Rdj kashyap @coderdjkashyap]

@insanekrishnaa interested and i have work experience

[Rdj kashyap @coderdjkashyap]

interviewer ask me :

In React, if we want to return multiple elements without using Fragment or wrapper tags like div/span, what approach can we use?

[Rdj kashyap @coderdjkashyap]

Lexical scoping

[Rdj kashyap @coderdjkashyap]

If you’re a student and understand Proxy and Reflect objects in JavaScript, you’re already ahead of many
others.

Best of luck for your bright future!

[Rdj kashyap @coderdjkashyap]

theoretically we can create a custom implementation similar to Promise behavior using callbacks and state management.
It may not support every internal JavaScript engine feature exactly like native Promise, but we can build a simplified version.

Basic idea is:
maintain states like pending, fulfilled, rejected
store success and failure callbacks
execute them after async completion
Something like:

class MyPromise {
constructor(executor) {
this.successCallback = null;
this.errorCallback = null;

const resolve = (value) => {
if (this.successCallback) {
this.successCallback(value);
}
};

const reject = (error) => {
if (this.errorCallback) {
this.errorCallback(error);
}
};

executor(resolve, reject);
}

then(callback) {
this.successCallback = callback;
return this;
}

catch(callback) {
this.errorCallback = callback;
return this;
}
}

Usage:
JavaScript
new MyPromise((resolve, reject) => {
setTimeout(() => {
resolve("Done");
}, 1000);
}).then((data) => {
console.log(data);
});
But native Promises are much more complex internally because they handle:
microtask queues
chaining
async scheduling
error propagation
Promise.all
Promise.race
and many edge cases.

[Rdj kashyap @coderdjkashyap]

Interview js question:-

If JavaScript didn’t have native Promises, could we implement our own Promise system?

[Rdj kashyap @coderdjkashyap]

@Swiggy but still lob you Lal wala chumma imoji

[Rdj kashyap @coderdjkashyap]

@Swiggy Hum parasites hain bhai, breakfast mein CJI ka bataya hua 'sukh-chain' aur system ka sukoon khaate hain. Kam se kam aapki tarah delivery partner ka commission aur customer ka paisa toh nahi hazam karte! 😉

[Rdj kashyap @coderdjkashyap]

@Swiggy Unemployed log toh CJI sahab ke mutabik system ke "parasites" hain, toh hum toh unka sukoon-o-chain (sukh-chain) hi khaate hain... Par aap log itne saare hidden charges lagake humara bacha-kucha sukoon kyu kha rahe ho? 🪳💀

[Rdj kashyap @coderdjkashyap]

@Swiggy Hum toh ghar walo ke taane aur career ki tension khate hain... par aap toh system ke wo "parasites" ho jo delivery boy ka commission aur customer ka sukoon dono kha jate ho. 💀

[Rdj kashyap @coderdjkashyap]

Frontend developers are slowly becoming backend developers.

A few years ago, frontend meant:
HTML, CSS, JavaScript, fixing UI bugs, and blaming APIs when things broke 😄
Now? We deal with SSR, authentication, caching, cookies, performance optimization, server actions, SEO etc.

At this point, some frontend developers know more infrastructure than they realize.

Modern frontend development is no longer just about building interfaces.
It’s becoming about understanding the entire experience — from server to screen.

[Rdj kashyap @coderdjkashyap]

Preparing for MERN stack interviews can feel overwhelming when you are just starting out

That is exactly why I created this beginner friendly carousel with 50 important MERN Stack interview questions and answers that are commonly asked in interviews ✨

In this carousel, you will learn concepts related to
MongoDB 🍃
Express.js ⚙️
React.js ⚛️
Node.js 🟢
REST APIs 🔗
Authentication 🔐
JWT 🛡️
Git and GitHub 🌐
Deployment 🚀
And many more

I explained every answer in a simple and easy to understand way so that beginners can learn without confusion

Whether you are a student, fresher, or aspiring full stack developer, this post will help you revise important concepts quickly before interviews 🎯

📌 Save this post for your next MERN stack interview and share it with your developer friends who are preparing too

[Rdj kashyap @coderdjkashyap]

@kritikakodes Node flutter, nextjs, react native

[Rdj kashyap @coderdjkashyap]

Adaptability is the most important skill in tech right now. 🚀

This 2025 vs. 2026 breakdown perfectly highlights how fast our daily toolkits are evolving. We are shifting from generalist platforms to precision AI tools whether it’s streamlining code, managing spreadsheets with Claude, or pushing the boundaries of DSLR quality image generation with Nano Banana 2.

As a mobile developer, staying ahead of this curve is how I ensure the React Native apps I build are efficient, scalable, and modern. You can’t build the products of tomorrow using the workflows of yesterday.

Which of these 2026 tools is your favorite so far?

[Rdj kashyap @coderdjkashyap]

@SuiInsiders details

[Rdj kashyap @coderdjkashyap]

@kritikakodes code fat gaya

[Rdj kashyap @coderdjkashyap]

🔻 I got rejected by Infosys criteria
🔻 I got rejected by Amazon
🔻 I got rejected by TCS HACKQUEST
🔻 I got rejected by TCS NQT criteria
🔻 I got rejected by Tudip criteria
🔻 I got rejected by Amdocs criteria

It wasn’t just one rejection. It kept happening again and again.

When you keep hearing “No,” it’s easy to start doubting yourself.

But I didn’t give up.

- I worked on becoming better every day.
- I fixed my Naukri and Resume
- I rebuilt my data engineering concepts
- I improved my SQL and core subjects
- I worked on real data projects
- I practiced mock interviews