Revisiting JavaScript Fundamentals for Career Growth

🚀 Day 3 – Crack Interviews Series 🔹 Topic: What is Async/Await in JavaScript? Async/Await is a cleaner way to handle asynchronous code built on top of Promises. 👉 It makes async code look like synchronous code. 💡 Real Example: function fetchData() { return new Promise((resolve) => { setTimeout(() => resolve("Data received"), 1000); }); } async function getData() { const result = await fetchData(); console.log(result); } getData(); 🎯 Interview Question: What happens if we don’t use "await" inside an async function? 👉 Answer: The function will return a Promise immediately without waiting for the result. 💼 Pro Tip: Always use "try...catch" with async/await for proper error handling. 👇 Do you use async/await in all your projects? #javascript #webdevelopment #nodejs #frontend #interviewprep #coding #developers

🚀 Sharing a 𝗣𝗼𝘄𝗲𝗿𝗳𝘂𝗹 𝗥𝗲𝘀𝗼𝘂𝗿𝗰𝗲 for 𝗝𝗮𝘃𝗮𝗦𝗰𝗿𝗶𝗽𝘁 𝗗𝗲𝘃𝗲𝗹𝗼𝗽𝗲𝗿𝘀 If you're preparing to switch from a 𝘀𝗲𝗿𝘃𝗶𝗰𝗲-𝗯𝗮𝘀𝗲𝗱 company to a 𝗽𝗿𝗼𝗱𝘂𝗰𝘁-𝗯𝗮𝘀𝗲𝗱 company. What are there ? ✅ Logic building across multiple topics ✅ Interview-oriented problem solving ✅ Real-world scenarios asked in product companies This can be really helpful for developers aiming to: 👉 Strengthen their JS fundamentals 👉 Crack product-based company interviews 👉 Improve coding confidence In my experience, mastering JavaScript logic is a game changer—it not only helps in interviews but also improves the way you write scalable and maintainable code. 💡 If you're on the same journey, I highly recommend you explore below link. Link : https://lnkd.in/gxJxtkwj Let’s keep learning and growing 🚀 #JavaScript #FrontendDevelopment #WebDevelopment #CodingInterview #SoftwareEngineering #CareerGrowth

🚀 Day 2 – Crack Interviews Series 🔹 Topic: What is Promise in JavaScript? A Promise is an object that represents the future result of an async operation. 👉 It has 3 states: - Pending ⏳ - Resolved ✅ - Rejected ❌ 💡 Real Example: const fetchData = new Promise((resolve, reject) => { let success = true; if (success) { resolve("Data received"); } else { reject("Error occurred"); } }); fetchData .then((res) => console.log(res)) .catch((err) => console.log(err)); 🎯 Interview Question: Why are Promises better than callbacks? 👉 Answer: - Avoid callback hell - Better error handling with ".catch()" - Cleaner and readable code 💼 Pro Tip: Promises are the base of async/await and modern async programming. 👇 Do you prefer Promises or async/await? #javascript #webdevelopment #nodejs #frontend #interviewprep #coding #developers

Got this interview question recently 👇 “Build a custom React hook to execute async functions on demand, with cancellation and retry support.” Sounds simple… until you start thinking like it’s production code 🤯 Most candidates stop at: 👉 loading, error, data But the real discussion started after that. What happens when: • A request is still in-flight and a new one starts? 🔄 • The API is slow or flaky? 🐢 • You retry blindly and overload the backend? ⚠️ • A stale response overrides fresh data? 🧠 That’s where the problem gets interesting. A solid implementation needs: 🛑 AbortController → to cancel in-flight requests 🔁 Request tracking → to avoid race conditions ⏳ Retry logic → with limits + backoff 🚫 Error awareness → don’t retry 4xx blindly Biggest takeaway: 👉 Writing the hook is easy 👉 Designing it for real-world edge cases is the actual skill 💡 In practice, you might use tools like React Query or SWR - but interviews like this test whether you understand what happens under the hood. Curious - would you build this yourself or rely on a library? 🤔 #Frontend #ReactJS #JavaScript #WebDevelopment #SoftwareEngineering #SystemDesign #TechInterview #Coding

🚀 Day 1 – Crack Interviews Series 🔹 Topic: What is Event Loop in JavaScript? JavaScript is single-threaded, but it can still handle async tasks using the Event Loop. 👉 It continuously checks: - Call Stack (what’s running) - Callback Queue (what’s waiting) When the stack is empty, it pushes queued tasks to execution. 💡 Real Example: console.log("Start"); setTimeout(() => { console.log("Async Task"); }, 0); console.log("End"); 👉 Output: Start End Async Task 🎯 Interview Question: Why does "setTimeout(fn, 0)" not run immediately? 👉 Answer: Because it goes to the callback queue and waits for the call stack to be empty. 💼 Pro Tip: Understanding Event Loop is key for handling async code, promises, and performance. 👇 Have you faced issues with async behavior in JavaScript? #javascript #webdevelopment #interviewprep #nodejs #frontend #backend #developers #coding

#JavaScript Interview Series: Do you REALLY know how Hoisting works? Ever wondered why you can call a function before it's defined, but let and const throw an error? That's Hoisting in action! 🧐 In JavaScript, variable and function declarations are moved to the top of their scope during the compilation phase. But there's a catch... ✅ Functions: Fully hoisted. You can call them anytime. ✅ var: Hoisted but initialized as undefined. ❌ let & const: Hoisted but in the "Temporal Dead Zone" (TDZ). You can't touch them until the line of declaration. Check out the example below: console.log(a); // undefined var a = 5; greet(); // "Hello!" function greet() { console.log("Hello!"); } // console.log(b); // ReferenceError! let b = 10; Mastering these core concepts is the difference between a Junior and a Senior developer. 💻✨ Ready to ace your next JS interview? I've curated a list of the most important JavaScript questions with deep dives and Hinglish explanations! 👇 🔗 Read more here:  https://lnkd.in/ghMhTcws #JavaScript #WebDevelopment #InterviewPrep #Coding #Programming #HashWebix #Frontend #ReactJS #NodeJS #TechInsights

I wrote a practical guide to React.js covering hooks, routing, and real-world patterns. Instead of theory, I focused on how React is actually used in production: How each Hook works with real examples When to use (and avoid) specific hooks Practical state management patterns Routing in real applications If you're working with React or preparing for frontend interviews, this might help you understand things more clearly.

🚀 Backend Interviews are not about syntax… they’re about thinking. Most developers believe Node.js & JavaScript interviews are about remembering functions. Reality? It’s about how you design, debug, and scale backend systems. Here’s a practical guide if you're preparing for MERN / Backend interviews 👇 🔹 Core JavaScript (Must Strong) • Closures, Promises, Async/Await • Event Loop & Callbacks • Array/Object manipulation (real-world use cases) 🔹 Node.js Fundamentals • How Node.js works (Single Thread, Event-driven) • Express.js basics (Routes, Middleware) • REST API creation (CRUD operations) 🔹 Database (MongoDB) • Schema Design (Mongoose) • Relationships & Optimization • CRUD + Aggregation basics 🔹 Real Backend Skills (Game Changer) • Authentication (JWT, Sessions) • Error Handling & Validation • API Security (rate limit, hashing passwords) • File Uploads & Image Handling 🔹 Projects > Theory Instead of saying “I know MERN.” 👉 Show: “I built a product with auth, dashboard & API system.” 💡 Interviews don’t select the most knowledgeable person… They select the one who can solve problems under pressure. Start building. Start breaking. Start fixing. That’s how backend developers are made. Follow Muhammad Nouman for more useful content #NodeJS #JavaScript #MERN #BackendDeveloper #WebDevelopment #CodingInterview #Developers

Four years ago, I learned React Hooks for the first time. Back then, I was moving from class components to function components, and honestly, I felt lost. How to store data? How to run code when the screen loads? It was messy. Then I started learning React Hooks one by one. First, useState and useEffect. They helped me store data and call APIs. But soon I saw my components re-rendering too many times. That's when useCallback and useMemo saved me. Then useRef to focus an input without making the page refresh again. And useReducer for when my state got too complex. Step by step, my code became cleaner, faster, and easier to understand. The biggest relief came when I learned useContext, no more passing props through many levels of components. It felt so good. I also had a strange layout bug, until I found useLayoutEffect, which runs code right before the browser paints the screen. Also don't forget useId, before this, I made unique IDs manually or install 3rd party package like uuid from npmjs. I mostly use them in every project. If you're still confused about React Hooks, take a look at the image below. Who knows? One hook you rarely use might be the answer to your problem. By the way, these hooks are also fundamental questions that technical interviewers often ask when you apply for a React role. So learning them well can help you both at work and in job interviews. 😃 #ReactJS #ReactHooks #FrontendDeveloper #InterviewPrep

Being strong in JavaScript and TypeScript is the gateway to crack interviews. Not just surface level. Get into depth. Look into how it actually works. Trust me, it gets interesting day by day. One such concept which I loved and still love to explain and solve: Event Loop Most developers know the definition. Few actually feel how it works. Let me break it down: JavaScript is single-threaded. One call stack. One thing at a time. So how does it handle setTimeout, API calls, and UI updates — all without freezing? That's where the Event Loop steps in. Here's what's actually happening under the hood: 🔹 Call Stack — Where your code executes. Functions get pushed in, popped out. 🔹 Web APIs — setTimeout, fetch, DOM events? These are handed off to the browser. JS doesn't wait. 🔹 Callback Queue (Macrotask Queue) — Once a Web API finishes, its callback waits here. 🔹 Microtask Queue — Promises land here. Higher priority than the callback queue. 🔹 Event Loop — Constantly watching. The moment the call stack is empty, it picks from the microtask queue first, then the callback queue. A classic interview question that trips people up: console.log("1"); setTimeout(() => console.log("2"), 0); Promise.resolve().then(() => console.log("3")); console.log("4"); The Output: 1 → 4 → 3 → 2 Why? Because setTimeout goes to the callback queue, but the Promise microtask jumps ahead in priority — even with a 0ms delay. This is the kind of depth that separates a developer who uses JavaScript from one who understands it. What's your favorite JS concept that changed how you think about code? Drop it in the comments! #JavaScript #TypeScript #EventLoop #WebDevelopment #InterviewPrep #FrontendDevelopment #JSDeepDive #LearningEveryDay