JavaScript Interview Questions for Frontend Developers

JavaScript Interview Preparation — Most Asked Concepts When preparing for frontend interviews, strong JavaScript fundamentals are essential. Frameworks evolve rapidly, but the core concepts of JavaScript remain constant. Here are some common areas that interviewers focus on: 1. JavaScript Basics - Primitive vs Non-Primitive data types - typeof operator - null vs undefined - NaN behavior - Dynamic typing in JavaScript These questions assess your understanding of how JavaScript operates internally. 2. ES6 Features - Arrow functions - Template literals - Destructuring - Enhanced object literals - Promises ES6 introduced powerful and cleaner features that are prevalent in modern codebases. 3. Variables & Hoisting A frequently discussed topic. Understand: - var vs let vs const - Block scope vs function scope - Hoisting behavior - Temporal Dead Zone Many developers use these concepts daily but find it challenging to explain them during interviews. 4. Functions & Execution Context Key concepts include: - Arrow functions vs traditional functions - this keyword behavior - call(), apply(), bind() A grasp of execution context demonstrates a deep understanding of JavaScript runtime behavior. 5. Functional Programming Modern JavaScript relies on: - Higher-order functions - map() - filter() - reduce() These are commonly used in frontend codebases. 6. Scope & Closures One of the most crucial JavaScript topics. Understand: - Global scope - Local scope - Scope chain - Closures Closures frequently appear in frontend interview questions. 7. Browser Concepts Frontend developers should be familiar with: - DOM (Document Object Model) - BOM (Browser Object Model) - Event handling These concepts explain how JavaScript interacts with the browser. One truth about JavaScript interviews is that while frameworks change every few years, JavaScript fundamentals remain unchanged. A strong foundation makes learning frameworks like React, Angular, or Vue much easier. Save this for your next frontend interview

🚀 Got a frontend interview coming up? Screenshot this. 📸 Here are the JavaScript topics that come up again and again in interviews. ――――――――――――――――――――――― 1️⃣ Core JavaScript Basics → Data types and comparisons → Truthy vs falsy values → Difference between == and === → Implicit vs explicit type coercion → Object references vs primitive values A classic trap: two objects with the same values are NOT equal in JavaScript because objects are compared by reference. ――――――――――――――――――――――― 2️⃣ Scope & Execution Context → Closures and lexical scope → Hoisting and the Temporal Dead Zone → The this keyword (arrow vs regular functions) Very common question: “What will this console.log output?” Always trace the scope chain carefully. ――――――――――――――――――――――― 3️⃣ Functions & Useful Patterns → Spread vs rest operators → call, apply, and bind → Currying and partial application If you can clearly explain spread vs rest, you're already ahead of many candidates. ――――――――――――――――――――――― 4️⃣ Working with Arrays & Objects → map, filter, reduce → When NOT to use them → Shallow vs deep copying Understanding shallow copies can save you from some very confusing bugs. ――――――――――――――――――――――― 5️⃣ JavaScript Mechanics → Prototypal inheritance → typeof vs instanceof → Event loop and call stack → Microtasks vs macrotasks Drawing the event loop diagram once makes async questions much easier. ――――――――――――――――――――――― 6️⃣ Async JavaScript → Callbacks vs Promises vs async/await → Error handling with async/await → Debounce vs throttle → Event delegation and bubbling Many developers forget proper error handling in async code. ――――――――――――――――――――――― 7️⃣ Browser & Networking Basics → How browsers render HTML, CSS and JS → Critical rendering path → Reflow vs repaint → DNS lookup, TCP handshake, TLS → CORS and preflight requests These topics show up a lot in mid-senior frontend interviews. ――――――――――――――――――――――― 8️⃣ Performance & Caching → Preload, prefetch and lazy loading → Service workers → localStorage, sessionStorage and cookies Knowing when to use each storage option matters more than memorising definitions. ――――――――――――――――――――――― 9️⃣ Frontend Architecture & Accessibility → Responsive design and mobile-first layouts → Media queries and viewport units → Semantic HTML, ARIA roles, focus management Accessibility questions are becoming more common in interviews. ――――――――――――――――――――――― A tip that helped me: Pick one section a day Learn it deeply Build a small demo Explain it to someone else That’s how concepts actually stick. 💪 ――――――――――――――――――――――― Which area do you feel least confident about right now? 1️⃣ JavaScript fundamentals 2️⃣ Event loop & async 3️⃣ Browser internals 4️⃣ Performance Save this post so you can review it before your next interview 🔖 #JavaScript #FrontendDev #ReactJS #WebDev #InterviewPrep

🚀 5 Advanced JavaScript Interview Questions for Frontend Developers Modern frontend interviews often test deep JavaScript concepts, not just syntax. Here are 5 advanced questions every frontend developer should understand. 1️⃣ What is a Closure in JavaScript? A closure is created when a function remembers variables from its outer scope even after the outer function has finished executing. Example: function outer() { let count = 0; return function inner() { count++; console.log(count); }; } const counter = outer(); counter(); Closures are commonly used for data privacy and function factories. 2️⃣ What is the JavaScript Event Loop? JavaScript is single-threaded, but it can handle asynchronous tasks using the event loop. The event loop manages: Call Stack Web APIs Callback Queue Microtask Queue (Promises) This allows non-blocking operations like API calls and timers. 3️⃣ What is the difference between null and undefined? • undefined → A variable declared but not assigned a value • null → An intentional absence of value assigned by the developer 4️⃣ What are Promises and how do they work? A Promise represents the result of an asynchronous operation. It has three states: Pending Fulfilled Rejected Promises are commonly used for API requests and async operations. 5️⃣ What is Debouncing in JavaScript? Debouncing limits how often a function executes. Example use cases: Search input suggestions Window resize events Scroll events It improves performance and user experience. 💡 Understanding these concepts helps frontend developers build efficient and scalable applications. #JavaScript #FrontendDevelopment #WebDevelopment #Programming #CodingInterview #MERN #Developer #JS

⚛️ 𝐀𝐜𝐞 𝐘𝐨𝐮𝐫 𝐑𝐞𝐚𝐜𝐭𝐉𝐒 𝐈𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰: 𝐌𝐚𝐬𝐭𝐞𝐫 𝐂𝐨𝐦𝐩𝐨𝐧𝐞𝐧𝐭𝐬, 𝐇𝐨𝐨𝐤𝐬, 𝐚𝐧𝐝 𝐌𝐨𝐫𝐞! 🚀 "The only way to do great work is to love what you do." – Steve Jobs 👉 JavaScript Interview Pack 2026 🚀 🔗 https://lnkd.in/ggHpPYWf Preparing for a ReactJS developer interview? Don't let the complexities of components, hooks, and state management intimidate you! This guide will help you navigate the process with confidence. ✨ By: InterviewBit 🚀 𝐖𝐡𝐚𝐭'𝐬 𝐈𝐧𝐬𝐢𝐝𝐞 𝐓𝐡𝐢𝐬 𝐆𝐮𝐢𝐝𝐞? ✅ Component Lifecycle & State Management: Deep dives into class and functional components, state, and props. ✅ Hooks Mastery: Understanding useState, useEffect, useContext, and custom hooks. ✅ React Router & API Integration: Navigating routing and data fetching. ✅ Performance Optimization: Techniques for improving React application performance. ✅ Real Interview Questions: Insights from top tech companies. ✅ Tips to Crack ReactJS Interviews: Proven strategies to impress interviewers. 👉 JavaScript Interview Pack 2026 🚀 🔗 https://lnkd.in/ggHpPYWf 📌 𝐌𝐮𝐬𝐭-𝐊𝐧𝐨𝐰 𝐈𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰 𝐐𝐮𝐞𝐬𝐭𝐢𝐨𝐧𝐬 🔹 Explain the difference between class and functional components. 🔹 Describe the React component lifecycle. 🔹 How do you manage state in a React application? 🔹 Explain the purpose of hooks and give examples. 🔹 How do you handle asynchronous API calls in React? 🔹 What are some techniques for optimizing React performance? 🔹 Explain React Router and its use cases. 💡 𝐓𝐢𝐩: Focus on explaining your thought process and demonstrating your understanding of React's core concepts. 🎯 𝐇𝐨𝐰 𝐭𝐨 𝐏𝐫𝐞𝐩𝐚𝐫𝐞 𝐟𝐨𝐫 𝐚 𝐑𝐞𝐚𝐜𝐭𝐉𝐒 𝐈𝐧𝐭𝐞𝐫𝐯𝐢𝐞𝐰? 1️⃣ Master React Fundamentals: Build a strong foundation in components, props, state, and hooks. 2️⃣ Practice Building Projects: Create personal projects to showcase your skills and experience. 3️⃣ Understand React Ecosystem: Familiarize yourself with React Router, Redux/Context API, and other relevant libraries. 4️⃣ Practice Coding Challenges: Solve coding problems related to React and JavaScript. 5️⃣ Conduct Mock Interviews: Simulate the interview experience to build confidence and refine your communication skills. 👉 JavaScript Interview Pack 2026 🚀 🔗 https://lnkd.in/ggHpPYWf 🔥 𝐑𝐞𝐦𝐞𝐦𝐛𝐞𝐫: Practice makes perfect! Show your passion for React and your ability to build robust applications. 💪 𝐓𝐨𝐩 𝐑𝐞𝐬𝐨𝐮𝐫𝐜𝐞𝐬 𝐟𝐨𝐫 𝐑𝐞𝐚𝐜𝐭𝐉𝐒 𝐄𝐧𝐭𝐡𝐮𝐬𝐢𝐚𝐬𝐭𝐬: 🌐 W3Schools.com 💡 JavaScript Mastery 💫 GeeksforGeeks 👉 JavaScript Interview Pack 2026 🚀 🔗 https://lnkd.in/ggHpPYWf 📤 Share with your network 💬 Comment your thoughts 🔖 Save for future reference 👍 Like if you found it helpful #w3schools #expressjs #javascript #frontend #backend #developers #css #reactjs #nextjs #roadmap #webdevelopment #mern #mean #angular #nodejs #expressjs #postgresql #sql #guide #useful #notes #Linkedin #LinkedinCommunity #Connections #viral #fyp

ADVANCED JAVASCRIPT CONCEPTS FOR INTERVIEWS #SaveForLater #MohitDecodes If you're preparing for JavaScript interviews, these are must-know concepts that can seriously level up your understanding 👇 -- Callback Function passed as an argument & executed later → leads to callback hell -- Promise Handles async operations → resolve / reject (cleaner than callbacks) -- Async/Await Syntactic sugar over promises → makes async code look synchronous -- Strict Mode ("use strict") Catches silent errors & enforces cleaner coding practices -- Higher Order Functions Functions that take/return other functions → map, filter, reduce -- Call, Apply, Bind Control the value of this → powerful for context handling -- Scope Block | Function | Global → defines variable accessibility -- Closures Access outer function variables even after execution -- Hoisting Variables & functions moved to top before execution -- IIFE Immediately Invoked Functions → avoid global pollution -- Currying Convert multi-arg function → chain of single-arg functions -- Debouncing Delay execution → improves performance (search inputs, etc.) -- Throttling Limit execution rate → useful in scroll/resize events -- Polyfills Add support for modern features in older browsers 💡 These are not just interview questions — they define how JavaScript actually works under the hood. Pro Tip: Don’t just read — implement each concept with code! 💬 Was this helpful? 🔖 Save for later 📢 Follow for more: Mohit Kumar #JavaScript #Frontend #WebDevelopment #ReactJS #InterviewPrep #Coding #100DaysOfCode

🎒 Frontend Developer Interview Guide: HTML, CSS & JavaScript! "Success comes from preparation and opportunity!" – Bobby Unser 👉 For JavaScript interview 2026 Pack: 🔗 Get it here: 💳 UPI / Wallets : https://lnkd.in/dX7a8B6i Are you getting ready for a frontend developer interview? Do tricky HTML, CSS, and JavaScript questions make you nervous? Don’t worry! Here’s a simple guide to help you prepare and succeed! 🚀 What’s Inside This Guide? ✅ HTML Questions – From basics to advanced topics ✅ CSS Questions – Flexbox, Grid, and more ✅ JavaScript Questions – Important concepts and tricky logic ✅ Real Interview Questions – Asked by top companies ✅ Tips to Crack Frontend Interviews – Proven strategies 📌 Must-Know Interview Questions 🔹 What are semantic elements in HTML? 🔹 How does CSS specificity work? 🔹 What is event delegation in JavaScript? 🔹 Difference between == and === in JavaScript? 🔹 How does JavaScript handle async operations? 🔹 What are media queries in CSS? 🔹 Explain the difference between let, const, and var. 💡 Tip: Try explaining these topics in simple words to understand them better! 🎯 How to Prepare for a Frontend Interview? 1️⃣ Learn the Basics First – Don’t just memorize, understand how things work! 2️⃣ Practice Daily – Solve JavaScript coding problems on LeetCode & CodeWars. 3️⃣ Build Small Projects – Try making a portfolio website or a simple web app. 4️⃣ Do Mock Interviews – Practice speaking about your code to improve confidence. 5️⃣ Stay Updated – Follow tech blogs, LinkedIn posts, and YouTube tutorials. 🎁 Bonus: Get a free PDF with common frontend interview questions to help you prepare better! 🔥 Remember: The more you practice, the more confident you will become. Keep learning and never give up! 💪 👉 For JavaScript interview 2026 Pack: 🔗 Get it here: 💳 UPI / Wallets : https://lnkd.in/dX7a8B6i 👉 Check Out ATS Friendly Resume: https://lnkd.in/d_kQSh76 Top Resources for Coding Enthusiasts: 🌐 W3Schools.com 💡 JavaScript Mastery 💻 Follow Anurag Shukla for daily tips, programming tricks, and development insights. 📤 Share with your network 💬 Comment your thoughts 🔖 Save for future reference 👍 Like if you found it helpful #Linkedin #LinkedinCommunity #Connections #viral #fyp #w3schools #expressjs #javascript #frontend #backend #developers #css #reactjs #nextjs #roadmap #webdevelopment #mern #mean #angular #nodejs #expressjs #postgresql #sql #guide #useful #notes

Want to Ace 👉 Web4you #JavaScript #Interviews? Master the Event Loop and Its Core Components! 𝟭. 𝗖𝗮𝗹𝗹 𝗦𝘁𝗮𝗰𝗸 - 𝗪𝗵𝗮𝘁 𝗶𝘀 𝗶𝘁? The Call Stack is where JavaScript keeps track of function calls. It is a stack structure that handles synchronous code execution. - 𝗛𝗼𝘄 𝗱𝗼𝗲𝘀 𝗶𝘁 𝘄𝗼𝗿𝗸? 1. When a function is invoked, it’s pushed onto the stack. 2. Once it finishes, it’s popped off. 3. If an error occurs during execution, it’s thrown from the stack. 𝟮. 𝗘𝘃𝗲𝗻𝘁 𝗤𝘂𝗲𝘂𝗲 (𝗖𝗮𝗹𝗹𝗯𝗮𝗰𝗸 𝗤𝘂𝗲𝘂𝗲) - 𝗪𝗵𝗮𝘁 𝗶𝘀 𝗶𝘁? The Event Queue (also known as the callback queue) stores events that are to be processed asynchronously, like events triggered by a setTimeout or DOM events. - 𝗛𝗼𝘄 𝗱𝗼𝗲𝘀 𝗶𝘁 𝘄𝗼𝗿𝗸? 1. When the Call Stack is empty, the Event Loop checks the Event Queue. 2. It then pushes the next task onto the stack for execution. 𝟯. 𝗠𝗶𝗰𝗿𝗼𝘁𝗮𝘀𝗸 𝗤𝘂𝗲𝘂𝗲 - 𝗪𝗵𝗮𝘁 𝗶𝘀 𝗶𝘁? The Microtask Queue holds tasks that need to be executed after the currently executing script, but before any events in the event queue. Microtasks include promise callbacks and other tasks like MutationObserver. - 𝗛𝗼𝘄 𝗱𝗼𝗲𝘀 𝗶𝘁 𝘄𝗼𝗿𝗸? Once the call stack is empty and before the event queue is processed, the event loop picks up and processes tasks in the microtask queue. This ensures that promises are resolved before other events are processed. 𝟰. 𝗘𝘃𝗲𝗻𝘁 𝗟𝗼𝗼𝗽 - 𝗪𝗵𝗮𝘁 𝗶𝘀 𝗶𝘁? The Event Loop is the mechanism that allows JavaScript to perform non-blocking operations by managing the order in which tasks are executed from the call stack, event queue, and microtask queue. - 𝗛𝗼𝘄 𝗱𝗼𝗲𝘀 𝗶𝘁 𝘄𝗼𝗿𝗸? The event loop constantly checks the call stack. If the call stack is empty, it checks the microtask queue and processes any pending microtasks. After all microtasks are processed, the event loop picks events from the event queue for execution. 𝗞𝗲𝘆 𝗣𝗼𝗶𝗻𝘁: Microtasks are always executed before the event queue. This is why Promise.then() is processed before setTimeout(). 𝟱. 𝗦𝗲𝘁𝗧𝗶𝗺𝗲𝗼𝘂𝘁 𝗮𝗻𝗱 𝗦𝗲𝘁𝗜𝗻𝘁𝗲𝗿𝘃𝗮𝗹 - 𝗪𝗵𝗮𝘁 𝗶𝘀 𝗶𝘁? setTimeout() and setInterval() are used to schedule code execution after a specified time, but they are added to the event queue and are processed after all synchronous code and microtasks. - 𝗛𝗼𝘄 𝗱𝗼𝗲𝘀 𝗶𝘁 𝘄𝗼𝗿𝗸? The setTimeout() and setInterval() tasks are executed after the current script is finished executing, which is why you may see asynchronous code run after synchronous code (even if it's scheduled for immediate execution). Follow Arun Dubey for more related content! #javascript #eventloop #frontend #reactjs #questions

Day-16 🔥 20 JavaScript questions asked before EVERY Angular interview — how many can you answer? 👇 1️⃣ What is the difference between var, let and const? 2️⃣ What is hoisting in JavaScript? 3️⃣ Explain closures with a real example 4️⃣ What is the difference between == and ===? 5️⃣ What is event bubbling and event capturing? 6️⃣ What is the difference between call, apply and bind? 7️⃣ What are arrow functions and how are they different from regular functions? 8️⃣ What is a pure function? 9️⃣ Explain higher order functions with example 🔟 What is the difference between synchronous and asynchronous code? Advanced Concepts: 1️⃣1️⃣ What is a Promise? How is it different from a callback? 1️⃣2️⃣ What is async/await and how does it work internally? 1️⃣3️⃣ What is the event loop in JavaScript? 1️⃣4️⃣ What is prototypal inheritance? 1️⃣5️⃣ Difference between shallow copy and deep copy? 1️⃣6️⃣ What are JavaScript Modules? (import/export) 1️⃣7️⃣ What is destructuring in JavaScript? 1️⃣8️⃣ What is the spread operator vs rest operator? 1️⃣9️⃣ What are template literals? 2️⃣0️⃣ What is optional chaining (?.) and nullish coalescing (??)? Reply in comments: 👍Which Question you can explain confidently in an interview? ♻️ Repost this to help fellow Angular developers prepare better. 🔔 Follow for more Angular + JavaScript interview content every week. #Angular #Javascript #WebDevelopment #InterviewPrep #FrontendDeveloper #AngularDeveloper #JavaScriptInterview #SoftwareEngineering #TechInterview #CodingInterview

I have seen candidates 𝗚𝗲𝘁 𝗛𝗶𝗿𝗲𝗱 not because they solved every problem perfectly. But because they showed a deep understanding of JavaScript fundamentals. Your React knowledge is solid. Your CSS skills are on point. But the interview is not going well. Then they ask you to solve a problem in vanilla JavaScript. This is your moment. Here is how JavaScript basics can turn your interview around: 𝟭. 𝗪𝗵𝗲𝗻 𝘁𝗵𝗲𝘆 𝗮𝘀𝗸 "𝗥𝗲𝗺𝗼𝘃𝗲 𝗱𝘂𝗽𝗹𝗶𝗰𝗮𝘁𝗲𝘀 𝗳𝗿𝗼𝗺 𝗮𝗻 𝗮𝗿𝗿𝗮𝘆 - While others struggle with complex solutions, you mention Set and spread operators. - Simple. Clean. Shows you understand ES6. 𝟮. 𝗪𝗵𝗲𝗻 𝘁𝗵𝗲𝘆 𝗮𝘀𝗸 "𝗙𝗶𝗻𝗱 𝘁𝗵𝗲 𝗺𝗼𝘀𝘁 𝗳𝗿𝗲𝗾𝘂𝗲𝗻𝘁 𝗲𝗹𝗲𝗺𝗲𝗻𝘁 - You confidently talk about using the reduce method while others are thinking about nested loops. - Interviewers love developers who know array methods well. 𝟯. 𝗪𝗵𝗲𝗻 𝘁𝗵𝗲𝘆 𝗮𝘀𝗸 𝗜𝗺𝗽𝗹𝗲𝗺𝗲𝗻𝘁 𝗱𝗲𝗯𝗼𝘂𝗻𝗰𝗶𝗻𝗴 - This one separates junior from senior developers. - If you can explain closures and setTimeout together, you stand out immediately. 𝟰. 𝗪𝗵𝗲𝗻 𝘁𝗵𝗲𝘆 𝗮𝘀𝗸 𝗖𝗵𝗲𝗰𝗸 𝗶𝗳 𝘀𝘁𝗿𝗶𝗻𝗴 𝗶𝘀 𝗽𝗮𝗹𝗶𝗻𝗱𝗿𝗼𝗺𝗲 Everyone thinks of long solutions. You mention splitting, reversing, and joining. Shows you think in JavaScript, not just translate from other languages. 𝗧𝗵𝗲 𝗿𝗲𝗮𝗹 𝗴𝗮𝗺𝗲 𝗰𝗵𝗮𝗻𝗴𝗲𝗿 𝗺𝗼𝗺𝗲𝗻𝘁𝘀: - When you explain why you chose map over forEach. - When you mention performance differences between different approaches. - When you talk about async/await and proper error handling. 𝗕𝘂𝘁 𝗵𝗲𝗿𝗲 𝗶𝘀 𝘄𝗵𝗮𝘁 𝗿𝗲𝗮𝗹𝗹𝘆 𝗶𝗺𝗽𝗿𝗲𝘀𝘀𝗲𝘀 𝗶𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄𝗲𝗿𝘀: Not just describing working solutions. But explaining WHY your approach works. Talking about browser compatibility. Mentioning edge cases. Discussing time complexity. 𝗠𝘆 𝗯𝗶𝗴𝗴𝗲𝘀𝘁 𝗶𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄 𝘄𝗶𝗻𝘀 𝗰𝗮𝗺𝗲 𝗳𝗿𝗼𝗺: - Explaining the event loop when discussing async code - Showing knowledge of proper error handling in promises - Discussing different ways to solve same problem - Knowing when to use which array method The trick is not memorizing solutions. It is understanding JavaScript deeply enough that you can think through problems step by step. Strong JavaScript skills show you can adapt to any frontend framework. Because at the end of the day, React, Vue, Angular - they are all just JavaScript. 𝗜 𝗵𝗮𝘃𝗲 𝗽𝗿𝗲𝗽𝗮𝗿𝗲𝗱 𝗜𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄 𝗣𝗿𝗲𝗽𝗮𝗿𝗮𝘁𝗶𝗼𝗻 𝗚𝘂𝗶𝗱𝗲 𝗳𝗼𝗿 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝗘𝗻𝗴𝗶𝗻𝗻𝗲𝗿𝘀. covering JavaScript, React, Next.js, System Design, and more. 𝗚𝗲𝘁 𝘁𝗵𝗲 𝗚𝘂𝗶𝗱𝗲 𝗵𝗲𝗿𝗲 - https://lnkd.in/d2w4VmVT 💙- If you've read so far, do LIKE and RESHARE the post

Top JavaScript #interview #Questions #Day34  1. What is the difference between var, let, and const in JavaScript?  2. What are closures in JavaScript, and how do they work?  3. What is the this keyword in JavaScript, and how does it behave in different contexts?  4. What is a JavaScript promise, and how does it handle asynchronous code?  5. What is the event loop, and how does JavaScript handle asynchronous operations?  6. What is hoisting in JavaScript, and how does it work?  7. What are JavaScript data types, and how do you check the type of a variable?  8. What is the difference between null and undefined in JavaScript?  9. What is a callback function, and how is it used?  10. How do you manage errors in JavaScript?  11. What is the difference between setTimeout() and setInterval()?  12. How do JavaScript promises work, and what is the then() method?  13. What is async/await, and how does it simplify asynchronous code in JavaScript?  14. What are the advantages of using async functions over callbacks?  15. How do you handle multiple promises simultaneously?  16. What are higher-order functions in JavaScript, and can you provide an example?  17. What is destructuring in JavaScript, and how is it useful?  18. What are template literals in JavaScript, and how do they work?  19. How does the spread operator work in JavaScript?  20. What is the rest parameter in JavaScript, and how does it differ from the arguments object?  21. What is the difference between an object and an array in JavaScript?  22. How do you clone an object or array in JavaScript?  23. What are object methods like Object.keys(), Object.values(), and Object.entries()?  24. How does the map() method work in JavaScript, and when would you use it?  25. What is the difference between map() and forEach() in JavaScript?  26. What is event delegation in JavaScript, and why is it useful?  27. What are JavaScript modules, and how do you import/export them?  28. What is the prototype chain in JavaScript, and how does inheritance work?  29. What is bind(), call(), and apply() in JavaScript, and when do you use them?  30. How does JavaScript handle equality comparisons with == and ===?  31. What is the Document Object Model (DOM), and how does JavaScript interact with it?  32. How do you prevent default actions and stop event propagation in JavaScript?  33. What is the difference between synchronous and asynchronous code in JavaScript?  34. What is the difference between an event object and a custom event in JavaScript?  35. How do you optimize performance in JavaScript applications? Follow Arun Dubey for more related content! 🤔 Having Doubts in technical journey? #javascript #freshers #interview #js #frontend #webdevlopment #linkedin #frontend