Mohammad Tauseeque Ansari’s Post

✅ Recently Appeared for a Front-End Developer Interview Hi everyone 👋, I recently appeared for a Front-End Developer interview and wanted to share some of the interesting questions asked across both rounds. If you're preparing for your next opportunity in Angular / JavaScript / TypeScript, this might be helpful! 🚀 🎯 Round 1 – Technical (JavaScript, TypeScript & Angular) 1️⃣ Difference between == and === in JavaScript 2️⃣ How do Promises work? Explain .then() and .catch() 3️⃣ What is Hoisting in JavaScript? 4️⃣ How does Change Detection work in Angular? 5️⃣ Difference between Reactive Forms and Template-Driven Forms 6️⃣ How does async / await work internally? 7️⃣ What is Lazy Loading in Angular and why is it useful? 8️⃣ Difference between Observables and Subjects in RxJS 9️⃣ What is a Pure Pipe in Angular? 🔟 What is CORS and where do we enable it? 💻 Round 2 – Practical & Scenario-Based 1️⃣ Bind API response data into a table with pagination and search 2️⃣ Implement form validation and display dynamic error messages 3️⃣ Create a component and pass data using @Input() and @Output() 4️⃣ How would you optimize a slow Angular page? 5️⃣ Difference between Local Storage, Session Storage, and Cookies 6️⃣ Implement Debouncing for a search input field 7️⃣ Difference between Subject and BehaviorSubject 8️⃣ Explain the use of trackBy in *ngFor for performance optimization 9️⃣ How to handle Route Guards in Angular? 🔟 Create a Custom Pipe and Directive 💡 Tip: If you're preparing for a Front-End role, make sure to revise these concepts they often form the core of interviews. #frontenddeveloper #angular #javascript #typescript #rxjs #webdevelopment #html #css #frontendinterview #developercommunity #interviewpreparation

🚀 30 Core JavaScript Concepts to Brush Up Before Your Next Frontend Interview Get all answers on interviewdepth.com Execution Context & Call Stack –> how JS runs your code line by line. Hoisting –>what gets lifted and what doesn’t. Closures –> lexical scope + hidden power. Event Loop & Concurrency Model –> microtasks vs macrotasks. Promises & async/await –> chaining, error handling, pitfalls. this keyword –> implicit, explicit, arrow functions. Prototypes & Inheritance –> how objects really share behavior. Scope (var, let, const) –> function, block, temporal dead zone. Functions as First-Class Citizens –> callbacks, higher-order functions. Currying & Partial Application –> real-world use in React handlers. Debounce & Throttle –> critical for performance in UI apps. Modules (CommonJS vs ESM) –> imports/exports, tree shaking. Type Coercion & Equality –> == vs ===, truthy/falsy traps. Array & Object Methods –> map, filter, reduce, destructuring. Spread & Rest Operators –> flexibility in params and objects. Error Handling –> try/catch, custom errors, async pitfalls. DOM & Event Delegation –> real interview classic. Garbage Collection & Memory Leaks –> weak references, closures. ES6+ Features –> default params, optional chaining, nullish coalescing. Performance & Big-O Basics –> why O(n²) in rendering kills apps. Event Propagation (Capture vs Bubble) –> subtle but critical. Shallow vs Deep Copy –> structuredClone, JSON tricks, pitfalls. Object.defineProperty & Property Descriptors –> helpful during coding questions. Generators & Iterators –> custom iteration logic. Symbols & Well-Known Symbols –> how JS handles unique identifiers. Set, Map, WeakSet, WeakMap –> and when to use them. Optional Chaining & Nullish Coalescing –> ?. vs ??. Immutability & Object.freeze/seal –> functional JS mindset. Polyfills & Transpilation –> Babel, core-js, how older browsers cope. Security in JS –> XSS, CSP, sanitizing inputs (often overlooked!). #javascript #javascriptdeveloper #reactjs #reactnative #vuejsdeveloper #angular #angulardeveloper

Here is the list of top 40 JavaScript #interview questions to ace #frontend #interviews: 1. What is JavaScript? 2. What are the data types supported by JavaScript? 3. What is the difference between `let`, `const`, and `var`? 4. Explain how `==` and `===` differ. 5. What is a closure? 6. What is hoisting? 7. Explain the concept of “this” in JavaScript. 8. What are JavaScript prototypes? 9. What is the difference between `null` and `undefined`? 10. How does JavaScript handle asynchronous operations? 11. What is a promise? 12. What are async/await functions? 13. Explain event delegation in JavaScript. 14. What are JavaScript modules? 15. How can you prevent a function from being called multiple times? 16. What is the event loop? 17. What is the difference between `apply()` and `call()` methods? 18. What is `bind()` used for? 19. What is a JavaScript event loop? 20. Explain the concept of "event bubbling" and "event capturing". 21. What is the difference between `deep copy` and `shallow copy`? 22. What are generator functions? 23. What is the `new` keyword used for? 24. How do JavaScript’s `setTimeout` and `setInterval` work? 25. What is a `Map` and how is it different from a `WeakMap`? 26. What is a `Set` in JavaScript? 27. What is `Object.create()` used for? 28. How does JavaScript’s garbage collection work? 29. What are decorators in JavaScript? 30. Explain the difference between `prototype` and `__proto__`. 31. What is the purpose of `Object.assign()`? 32. What are template literals? 33. What is the spread operator? 34. What is the rest parameter? 35. Explain the `for...of` loop. 36. What are `async` and `await` used for? 37. What is `Symbol` used for in JavaScript? 38. How do you create a class in JavaScript? 39. What is destructuring in JavaScript? 40. What is the Proxy object? #javascript #frontenddeveloper #interviewquestions #webdevelopment #coding #typescript

✅ Recently I gave multiple Frontend interviews – and almost everywhere the panel focused heavily on JavaScript, TypeScript, React, Angular, and even Vue. So, I compiled 50 most frequently asked questions that can help every frontend developer preparing for interviews. ------------------------------------------- ✅ Top 50 Interview Questions (Must-Know) ✅ JavaScript (15 Questions) 1. Difference between var, let, and const? 2. What is Hoisting and how does it work? 3. Explain Event Loop & Call Stack. 4. What are Promises and async/await? 5. What is Closure? Give a real example. 6. Difference between == vs ===? 7. Explain Higher Order Functions. 8. What is the difference between map, filter, reduce? 9. What are Arrow functions and how are they different from normal functions? 10. What is Prototype & Prototypal Inheritance? 11. What is Debouncing & Throttling? 12. How does JavaScript handle Memory Management? 13. What are Pure Functions? 14. Explain Event Bubbling & Capturing. 15. What is the difference between synchronous & asynchronous code? ------------------------------------------- ✅ TypeScript (10 Questions) 16. What is TypeScript and why do we use it? 17. Difference between interface vs type? 18. What are Generics in TypeScript? 19. What is any, unknown, never, and void? 20. What are Union and Intersection types? 21. What is Type Inference? 22. Explain Enums in TypeScript. 23. What is Duck Typing? 24. What is readonly property in TS? 25. How does TypeScript improve large-scale application development? ------------------------------------------- ✅ React (10 Questions) 26. What are Components? Functional vs Class? 27. What are Hooks? Explain useState and useEffect. 28. What is Virtual DOM and how does it work? 29. What is Prop Drilling? How to avoid it? 30. What are controlled vs uncontrolled components? 31. What is Context API? 32. What is useMemo and useCallback? 33. What is Reconciliation in React? 34. Difference between state and props? 35. Why keys are used inside lists? ------------------------------------------- ✅ Angular (10 Questions) 36. Difference between Components vs Modules vs Services. 37. What is Dependency Injection? 38. What is Data Binding? Types of data binding. 39. What are Pipes & Directives? 40. What is RxJS and Observables? 41. What is Change Detection? 42. Lifecycle Hooks in Angular. 43. What is Lazy Loading? 44. How does Angular handle form validation? 45. What is Angular Routing & Guards? ------------------------------------------- ✅ Vue.js (5 Questions) 46. What is Vue and why is it lightweight? 47. What are Single File Components? 48. Data Binding in Vue (v-model). 49. What are Computed Properties & Watchers? 50. Lifecycle Hooks in Vue. ------------------------------------------- If you are preparing for Frontend Developer interviews, these topics will help you score well in technical rounds. #javascript #typescript #reactjs #angular #vuejs #frontend #interviewquestions #webdevelopment #developers

Want to Ace #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 W3Schools.com

Want to Ace #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 W3Schools.com

💡 **Frontend Interview Question for Angular Developer** --- **Q1:** What is Angular? How is it different from AngularJS? --- ### 🧠 Answer: Angular is a **TypeScript-based front-end web application framework** developed by **Google**. It's designed for building **Single Page Applications (SPAs)** with clean architecture and maintainable code. --- ### ⚙️ AngularJS vs Angular — Key Differences **1. Language:** - **AngularJS:** JavaScript - **Angular:** TypeScript (superset of JavaScript) **2. Architecture:** - **AngularJS:** MVC (Model-View-Controller) - **Angular:** Component-based **3. Mobile Support:** - **AngularJS:** No native mobile support - **Angular:** Designed with mobile-first in mind **4. Performance:** - **AngularJS:** Uses dirty checking → slower with large data - **Angular:** Faster with Ahead-of-Time (AOT) compilation and improved change detection **5. Tooling:** - **AngularJS:** Limited CLI support - **Angular:** Powerful CLI for scaffolding, testing, and building --- ✅ **In short:** **Angular** is a **complete rewrite** of AngularJS — focusing on **speed, modularity, and scalability**, making it a must-have for **modern web development**.

🚀 Top 10 Advanced JavaScript Interview Questions & Answers 💼💡 If you’re preparing for frontend or full-stack interviews, mastering these JavaScript concepts is a must! 1️⃣ Closure A closure is when a function remembers its lexical scope even after the outer function has executed. Code: function outer() { let count = 0; return function inner() { count++; console.log(count); }; } const counter = outer(); counter(); // 1 counter(); // 2 2️⃣ Event Delegation Attach a single event listener to a parent element to manage events of its child elements using event.target. 3️⃣ == vs === == → checks value (performs type coercion) === → checks value + type (strict equality) Code: '5' == 5 // true '5' === 5 // false 4️⃣ The “this” Keyword Refers to the object executing the current function. In arrow functions, this is lexically bound (taken from the outer scope). 5️⃣ Promises Used to handle asynchronous operations. Code: const p = new Promise((resolve) => resolve("Success")); p.then(console.log); 6️⃣ Async / Await Syntactic sugar over Promises for cleaner async code. Code: async function fetchData() { const res = await fetch(url); const data = await res.json(); } 7️⃣ Hoisting Variables and functions are moved to the top of their scope during compilation. Code: console.log(a); // undefined var a = 5; 8️⃣ Arrow Functions Shorter syntax, no own this, arguments, or super. Code: const add = (a, b) => a + b; 9️⃣ Event Loop Manages asynchronous tasks — ensures non-blocking behavior by moving callbacks from the task queue to the call stack once it’s empty. 🔟 IIFE (Immediately Invoked Function Expression) Executes immediately after its definition. Code: (function() { console.log("Runs immediately"); })(); 💬 These are must-know concepts for any JavaScript developer aiming to ace technical interviews and build a strong foundation. 💻 Keep practicing, keep learning — and you’ll nail your next interview! ⚡ #JavaScript #WebDevelopment #Frontend #MERN #InterviewPreparation #Coding #Developers

Want to impress in #JavaScript #interviews? Understand the 𝗘𝘃𝗲𝗻𝘁 𝗟𝗼𝗼𝗽 and its 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? Whenever a function is called, it gets pushed onto the call stack. When the function finishes execution, it is popped off. If there’s an error in synchronous code, the stack will throw an error. 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? Once the call stack is empty, the event loop looks at the event queue and pushes the events to the call stack for execution. This ensures that asynchronous code executes after synchronous code. 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. 𝗜 𝗵𝗮𝘃𝗲 𝗰𝗿𝗲𝗮𝘁𝗲𝗱 𝗮 𝗖𝗼𝗺𝗽𝗹𝗲𝘁𝗲 𝗜𝗻𝘁𝗲𝗿𝘃𝗶𝗲𝘄 𝗣𝗿𝗲𝗽 𝗚𝘂𝗶𝗱𝗲 — covering JavaScript, React, Next.js, System Design, and more. 𝗙𝗼𝗿 𝗙𝗿𝗼𝗻𝘁𝗲𝗻𝗱 𝗗𝗲𝘃 - https://lnkd.in/gJjpG_Tt 𝗙𝗼𝗿 𝗙𝘂𝗹𝗹𝘀𝘁𝗮𝗰𝗸 𝗗𝗲𝘃 - https://lnkd.in/gJ6Nu8D6 If you've read so far, do LIKE and RESHARE the post👍

👋 Hi everyone, I recently appeared for a Front-End Developer Interview and wanted to share some really interesting questions asked across both rounds. 🎯 Round 1 – Technical (JavaScript, TypeScript & Angular) 1️⃣ Difference between == and === Ans: == checks value (performs type coercion), while === checks value + type (strict comparison). 2️⃣ How do Promises work? Explain .then() and .catch() Ans: Promise represents async completion. .then() handles success, .catch() handles errors. 3️⃣ What is Hoisting in JavaScript? Ans: JS moves declarations (not initialization) to the top of scope before execution. 4️⃣ How does Change Detection work in Angular? Ans: Angular checks component tree to detect data changes and update the DOM using zones. 5️⃣ Difference between Reactive Forms and Template-Driven Forms Ans: Reactive = code-driven, scalable, testable. Template-driven = HTML-driven, easy but less scalable. 6️⃣ How does async / await work internally? Ans: It is syntactic sugar over Promises—await pauses inside async function until Promise resolves. 7️⃣ What is Lazy Loading in Angular? Ans: Loading modules on demand to reduce initial bundle size and improve performance. 8️⃣ Difference between Observables and Subjects in RxJS Ans: Observable is unicast (each subscriber gets its own stream), Subject is multicast (same stream for all). 9️⃣ What is a Pure Pipe in Angular? Ans: A pipe that runs only when inputs change (no re-execution on every change detection cycle). 🔟 What is CORS and where do we enable it? Ans: A security feature that allows/blocks cross-domain requests. Enabled on server (API) side. 💻 Round 2 – Practical & Scenario-Based 1️⃣ Bind API response data into a table with pagination and search Ans: Fetch data → store in state → apply filter & slicing → display using *ngFor. 2️⃣ Implement form validation and dynamic error messages Ans: Use Angular Validators; show errors using formControl.errors. 3️⃣ Pass data using @Input() and @Output() Ans: @Input() → parent to child; @Output() + EventEmitter → child to parent. 4️⃣ How to optimize a slow Angular page? Ans: Use OnPush, trackBy, Lazy Loading, avoid heavy loops, unsubscribe from Observables. 5️⃣ Difference between Local Storage, Session Storage, and Cookies Ans: Local = persistent, Session = ends on tab close, Cookies = small data sent with every request. 6️⃣ Implement Debouncing for a search field Ans: Use debounceTime() in RxJS or use setTimeout pattern. 7️⃣ Subject vs BehaviorSubject Ans: BehaviorSubject stores initial value + last emitted value; Subject does not. 8️⃣ Use of trackBy in *ngFor Ans: Prevents re-rendering by uniquely identifying list items → boosts performance. #Angular #JavaScript #TypeScript #FrontendDevelopment #WebDevelopment #AngularInterview #FrontendInterview #TechCareer #CodingInterviews #RxJS #LinkedInTech #AngularDeveloper #MERN #UIDeveloper