Anuj Sharma’s Post

React interview coming up? 🤔 Here's a common question that stumps many, but shouldn't be overlooked! ➡️ **"What's the difference between `useState` and `useRef`?"** Both are hooks, but serve distinct purposes: **`useState`**: Used for managing **state** that, when updated, causes a component to re-render. Perfect for UI changes. ```javascript const [count, setCount] = useState(0); ``` **`useRef`**: Used for referencing values that persist across renders **without causing re-renders** when updated. Ideal for DOM elements or mutable values that don't directly affect the UI. ```javascript const inputRef = useRef(null); ``` Think of `useState` for visual updates, `useRef` for persistent, non-rendering values. 💡 What other React hook questions often trip you up? #ReactJS #FrontendDeveloper #InterviewPrep #JavaScript @Dan Abramov

“I know React really well, then why did I still fail my frontend interview?” Last week, I spoke with a candidate who said this after his interview. He built projects, knew React hooks, and could design good UIs… But when the interviewer started asking core JavaScript questions, things went wrong. That’s when I realized, many frontend developers focus heavily on frameworks but skip the language that powers them that is JavaScript. If you’re preparing for a JavaScript + React interview, don’t miss these core concepts: 1. How JavaScript works inside the browser Understand the JS engine, single-threaded model, and event loop. 2. Execution Context Know how JS sets up memory (creation + execution phase). 3. Call Stack How functions are executed in order and what happens when the stack overflows. 4. Hoisting Why variables and functions seem to “exist” before being declared. 5. undefined vs not defined Declared but not assigned → undefined. Never declared → ReferenceError. 6. Scope & Scope Chain Understand how JS looks for variables, from inner to outer scopes. 7. var, let, const Scope, hoisting, and reassignment differences, this one trips up many. 8. Closures Functions that remember their outer scope even after that scope is gone. 9. Callback Functions Functions passed into other functions to be executed later. 10. Asynchronous JavaScript Master callbacks, Promises, and async/await, async code is everywhere. 11. Higher Order Functions Functions that take or return other functions, used constantly in JS & React. 12. map, filter, reduce If you can explain these three clearly, you’re already ahead of many. These are not just theory, they’re the DNA of React itself. Hooks, components, and even rendering behavior all rely on these core JS principles. So before diving deep into React libraries, take a week to revise plain JavaScript. It’ll pay off in your next interview and make you a much better frontend developer. ✅ Save this list I’ll be sharing more technical questions and topics in upcoming posts. Feel free to share your own experiences or thoughts in the comments And what’s one JS concept that confused you at first but later “clicked”? Let’s discuss in the comments. #ReactJS #FrontendDeveloper #InterviewPrep #JavaScript #WebDevelopment

🚀⚛️ Master React from Zero to Advanced —Interview Question⚛️ Are you diving into frontend development or preparing for React interviews? Here’s something that will make your journey smoother — my comprehensive React Notes (Handwritten + Conceptual) covering 50 essential interview questions with clear, beginner-friendly answers. 📘 What’s Inside: ✅ Core React concepts — JSX, Virtual DOM, Components, Props & State ✅ Hooks explained — useState, useEffect, useReducer, useContext, useMemo ✅ Advanced topics — Redux, Context API, Error Boundaries, Suspense, Code Splitting ✅ Practical examples to strengthen your fundamentals 💡 Whether you're a beginner learning React or a developer preparing for interviews, these notes will help you revise quickly and confidently. 👉Follow-Gyanendra Namdev Let’s build beautiful UIs with the power of React ⚛️ #ReactJS #WebDevelopment #Frontend #JavaScript #ReactHooks #LearningJourney #CodingCommunity #100DaysOfCode

🚀 React Toughest Interview Questions and Answers Q3: What are React Hooks and why were they introduced? 👉 Answer: React Hooks are special functions that let you “hook into” React features like state and lifecycle methods without writing a class component. They were introduced in React 16.8 to solve three main problems: 1. Complex logic in classes: Sharing stateful logic between components was difficult and often required patterns like HOCs or render props. 2. Confusing lifecycle methods: Class components mixed unrelated logic inside lifecycle methods (e.g., componentDidMount, componentDidUpdate). 3. Better code reuse and readability: Hooks allow smaller, reusable functions that manage logic cleanly. Common hooks include: useState() → For managing state useEffect() → For side effects (API calls, subscriptions, etc.) useContext() → For accessing context values useMemo() / useCallback() → For optimization useRef() → For accessing DOM or mutable values 🧠 Example: import React, { useState, useEffect } from "react"; function Counter() { const [count, setCount] = useState(0); useEffect(() => { document.title = `Count: ${count}`; }, [count]); return ( <button onClick={() => setCount(count + 1)}> Clicked {count} times </button> ); } ✅ Hooks enable functional components to handle state, lifecycle, and side effects — making code cleaner and more reusable. --- #react #reactjs #reactinterview #frontend #javascript #reacthooks #webdevelopment #interviewprep #reactquestions #codinginterview

🔥 Top 04 JavaScript Practical Interview Questions for Practice If you're preparing for a Front-End Developer or JavaScript Developer interview, here are some real-world coding questions you must try 👇 💡 1. String Case Converter Create a program that converts a given string to uppercase or lowercase. 💡 2. Palindrome Checker Write a program that checks if a given string is a palindrome or not. 💡 3. Prime Number Checker Create a program that checks whether a given number is prime. 💡 4. Longest Word Finder Write a program that determines the longest word in a given sentence. 🚀 Practicing these small but powerful problems helps you improve logic building, string handling, and problem-solving skills — exactly what interviewers look for! 💬 Drop a “✅ Done” once you’ve solved them all! #JavaScript #FrontendDeveloper #CodingInterview #JavaScriptInterview #WebDevelopment #Auroskkil #LearnCoding #Frontend #CodingPractice #ReactDeveloper #WebDev #JS #CodeChallenge

🚀 List of Resources to Prepare For Your Next JavaScript/React Interview 🚀 ✅ List of 1000 JavaScript Interview Questions - https://lnkd.in/dUuSF3FC 📋 ✅ 37 Essential JavaScript Interview Questions - https://lnkd.in/d2YSPts7 📚 ✅ JavaScript Code Challenges - https://lnkd.in/dvbYw4-7 💡 ✅ 30 Seconds Of Interviews - https://lnkd.in/dMStyk_z ⏰ ✅ Front End Interview Handbook - https://lnkd.in/dy8z8zSj 📘 ✅ 500 ReactJS Interview Questions & Answers - https://lnkd.in/dJTkky4a 🤯 ✅ 100+ React/Next.js Interview Questions: http://bit.ly/4hot5BH 𝗣𝗦: 𝗧𝗼𝗱𝗮𝘆 𝗜𝘀 𝗧𝗵𝗲 𝗟𝗮𝘀𝘁 𝗗𝗮𝘆 𝗢𝗳 𝗗𝗶𝘄𝗮𝗹𝗶 + 𝗕𝗹𝗮𝗰𝗸 𝗳𝗿𝗶𝗱𝗮𝘆 𝗦𝗮𝗹𝗲... 𝗚𝗲𝘁 𝗮𝗹𝗹 𝗰𝘂𝗿𝗿𝗲𝗻𝘁 + 𝗳𝘂𝘁𝘂𝗿𝗲 𝗰𝗼𝘂𝗿𝘀𝗲𝘀/𝗲𝗯𝗼𝗼𝗸𝘀/𝘄𝗲𝗯𝗶𝗻𝗮𝗿𝘀 𝗮𝘁 𝗷𝘂𝘀𝘁 $𝟭𝟱 / ₹𝟭𝟮𝟬𝟬 (𝗢𝗻𝗲-𝘁𝗶𝗺𝗲 𝗣𝗮𝘆𝗺𝗲𝗻𝘁) 𝗶𝗻𝘀𝘁𝗲𝗮𝗱 𝗼𝗳 𝗿𝗲𝗴𝘂𝗹𝗮𝗿 𝗽𝗿𝗶𝗰𝗲 $𝟮𝟬𝟲 / ₹𝟭𝟲,𝟰𝟴𝟬. 𝗣𝗮𝘆 𝗢𝗻𝗹𝘆 𝗢𝗻𝗰𝗲 𝗧𝗼𝗱𝗮𝘆 𝗔𝗻𝗱 𝗚𝗲𝘁 𝗟𝗶𝗳𝗲𝘁𝗶𝗺𝗲 𝗔𝗰𝗰𝗲𝘀𝘀 – 𝗡𝗼 𝗠𝗼𝗻𝘁𝗵𝗹𝘆/𝗬𝗲𝗮𝗿𝗹𝘆 𝗥𝗲𝗻𝗲𝘄𝗮𝗹𝘀. 𝗛𝘂𝗿𝗿𝘆 𝘂𝗽! 𝗟𝗶𝗻𝗸 𝗶𝘀 𝗶𝗻 𝘁𝗵𝗲 𝗰𝗼𝗺𝗺𝗲𝗻𝘁 𝗮𝗻𝗱 𝗶𝗻 𝘁𝗵𝗲 𝗳𝗲𝗮𝘁𝘂𝗿𝗲𝗱 𝘀𝗲𝗰𝘁𝗶𝗼𝗻 𝗼𝗳 𝗺𝘆 𝗟𝗶𝗻𝗸𝗲𝗱𝗜𝗻 𝗽𝗿𝗼𝗳𝗶𝗹𝗲. #javascript #reactjs #nextjs #webdevelopment

💬 Today’s Frontend Interview Experience 😎 Not cracked it yet… but definitely learned a lot from this round! Every question made me rethink JavaScript and React fundamentals 🔥 Here’s what the interviewer asked me 👇 🧠 JavaScript Concepts: Explain Type Coercion — why "1" + 2 ≠ "1" - 2 What is Currying, and how can we pass one more parameter? Difference between call, apply, and bind What is the Temporal Dead Zone? Best practice to declare a variable — let, const, or var? How to avoid memory leakage in closures? ⚛️ React Core: Write a useEffect example and explain its dependencies What is Batching in React? What is React Fiber and why was it introduced? 🧩 Logical & Brain Teasers: Add a string to a number vs subtract a number from a string (Type Coercion magic 🪄) Update a key-value pair from a shallow copy of an object using const, then let, then var Basic loop question behaviour with let and var — for (i < 5) API discussions — Open API, GraphQL, and RESTful API differences 💡 Bonus Discussions: What exactly is JSX, and what does it finally get converted into? Data types in JavaScript — which ones are mutable? Which are not? Didn’t clear the round, but definitely gained clarity on what to focus next time 🚀 Every rejection = one step closer to perfection 💪 If you’ve faced similar tricky questions, drop them in the comments 👇 Let’s help each other grow 🌱 #FrontendDevelopment #WebDevelopment #JavaScript #ReactJS #InterviewExperience #UIDeveloper #TechJourney

🚀JavaScript Important Interview Questions If you’re preparing for frontend developer or JavaScript developer interviews, mastering core concepts is key. Here’s a quick guide based on top interview topics that help you ace your next JavaScript interview 👇 🔹 Top JavaScript Concepts to Revise: ✅ Introduction to JavaScript ✅ Variables and Data Types ✅ Operators (Arithmetic, Logical, Comparison) ✅ Conditional Statements (if, else, switch) ✅ Loops (for, while, do…while) ✅ Functions and Return Statements ✅ Arrays and Objects ✅ Events and Event Handling ✅ JavaScript Objects (Math, Date, String) ✅ DOM Manipulation ✅ Interview Logic Practice Questions 💬 Example Question: 👉 What is the difference between var, let, and const in JavaScript? 👉 How does JavaScript handle scope and hoisting? 👉 What is the difference between == and ===? 👉 Explain how events work in JavaScript. 📘 Tip: Practice writing code for each topic and understand how it works behind the scenes #JavaScript #FrontendDevelopment #WebDevelopment #JavaScriptInterview #CodingInterview #TechInterview #FrontendEngineer #DeveloperCommunity #CodingPreparation

🚀Crack Any JavaScript Interview with These 100 Questions! Are you preparing for a Frontend Developer or Full-Stack Developer role?
 I've compiled a PDF guide with the Top 100 JavaScript Interview Questions & Answers that will help you boost your confidence and increase your chances of getting selected! From basics like var, let, and const to advanced topics like closures, async/await, event loop, and more — it's all covered! What’s Inside? ✅ Beginner to Advanced Questions ✅ Real Interview Scenarios
 ✅ Code Examples & Explanations
 ✅ Easy to Download PDF Grab your FREE copy now!
Let me know in the comments or DM me “JS100” to get it! Follow for more : Shubham Maurya #JavaScript #Frontend #WebDevelopment #InterviewPreparation #TechJobs #CareerGrowth #debugwithshubham

Over the past few weeks, I have been diving deep into React.js, understanding its core concepts, exploring hooks, components, and lifecycle methods. To help others who are preparing for interviews or just starting their React journey, I have compiled a list of important React.js interview questions with clear & easy explanations. Check out the full post here: https://lnkd.in/g8C8Kmbn Hope this helps fellow learners and developers preparing for their next opportunity! Let’s grow together. #ReactJS #WebDevelopment #Frontend #JavaScript #LearningInPublic #TechCommunity #DebugBoat