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Backend Basics Interview Questions β Part 2 (Express.js Routing) ππ§
π 1. What is Routing in Express.js?
A: Routing defines how your application responds to client requests (GET, POST, etc.) to specific endpoints (URLs).
π 2. Basic Route Syntax
app.get('/home', (req, res) => {
res.send('Welcome Home');
});
π 3. Route Methods
β¦ app.get() β Read data
β¦ app.post() β Create data
β¦ app.put() β Update data
β¦ app.delete() β Delete data
π 4. Route Parameters
app.get('/user/:id', (req, res) => {
res.send(req.params.id);
});
π 5. Query Parameters
app.get('/search', (req, res) => {
res.send(req.query.keyword);
});
π 6. Route Chaining
app.route('/product').get(getHandler).post(postHandler).put(putHandler);
π 7. Router Middleware
const router = express.Router();
router.get('/about', (req, res) => res.send('About Page'));
app.use('/info', router); // URL: /info/about
π 8. Error Handling Route
app.use((req, res) => {
res.status(404).send('Page Not Found');
});
π‘ Pro Tip: Always place dynamic routes after static ones to avoid conflicts.
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Backend Basics Interview Questions β Part 1 (Node.js) π§ π»
π 1. What is Node.js?
A: Node.js is a runtime environment that lets you run JavaScript on the server side. It uses Googleβs V8 engine and is designed for building scalable network applications.
π 2. How is Node.js different from traditional server-side platforms?
A: Unlike PHP or Java, Node.js is event-driven and non-blocking. This makes it lightweight and efficient for I/O-heavy operations like APIs and real-time apps.
π 3. What is the role of the package.json file?
A: It stores metadata about your project (name, version, scripts) and dependencies. Itβs essential for managing and sharing Node.js projects.
π 4. What are CommonJS modules in Node.js?
A: Node uses CommonJS to handle modules. You use require() to import and module.exports to export code between files.
π 5. What is the Event Loop in Node.js?
A: It allows Node.js to handle many connections asynchronously without blocking. Itβs the heart of Nodeβs non-blocking architecture.
π 6. What is middleware in Node.js (Express)?
A: Middleware functions process requests before sending a response. They can be used for logging, auth, validation, etc.
π 7. What is the difference between process.nextTick(), setTimeout(), and setImmediate()?
A:
β¦ process.nextTick() runs after the current operation, before the next event loop.
β¦ setTimeout() runs after a minimum delay.
β¦ setImmediate() runs on the next cycle of the event loop.
π 8. What is a callback function in Node.js?
A: A function passed as an argument to another function, executed after an async task finishes. Itβs the core of async programming in Node.
π 9. What are Streams in Node.js?
A: Streams let you read/write data piece-by-piece (chunks), great for handling large files. Types: Readable, Writable, Duplex, Transform.
π 10. What is the difference between require and import?
A:
β¦ require is CommonJS (used in Node.js by default).
β¦ import is ES6 module syntax (used with "type": "module" in package.json).
π¬ Tap β€οΈ for more!
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Credit goes to @Mr_NeophyteX
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π° CSS inset Property.
β
Frontend Frameworks Interview Q&A β Part 2 ππΌ
1οΈβ£ What is Virtual DOM in React?
Answer:
The Virtual DOM is a lightweight copy of the real DOM. React updates it first, calculates the difference (diffing), and then efficiently updates only what changed in the actual DOM.
2οΈβ£ Explain data binding in Angular.
Answer:
Angular supports one-way, two-way ([(ngModel)]), and event binding to sync data between the component and the view.
3οΈβ£ What is JSX in React?
Answer:
JSX stands for JavaScript XML. It allows you to write HTML-like syntax inside JavaScript, which is compiled to Reactβs createElement() calls.
4οΈβ£ What are slots in Vue.js?
Answer:
Slots allow you to pass template content from parent to child components, making components more flexible and reusable.
5οΈβ£ What is lazy loading in Angular or React?
Answer:
Lazy loading is a performance optimization technique that loads components or modules only when needed, reducing initial load time.
6οΈβ£ What are fragments in React?
Answer:
<React.Fragment> or <> lets you group multiple elements without adding extra nodes to the DOM.
7οΈβ£ How do you lift state up in React?
Answer:
By moving the shared state to the closest common ancestor of the components that need it, and passing it down via props.
8οΈβ£ What is a watch property in Vue?
Answer:
watch allows you to perform actions when data changes β useful for async operations or side effects.
9οΈβ£ What is dependency injection in Angular?
Answer:
A design pattern where Angular provides objects (like services) to components, reducing tight coupling and improving testability.
π What is server-side rendering (SSR)?
Answer:
SSR renders pages on the server, not the browser. It improves SEO and load times. Examples: Next.js (React), Nuxt.js (Vue), Angular Universal.
π¬ Tap β€οΈ for more!
β
Frontend Frameworks Interview Q&A β Part 1 ππΌ
1οΈβ£ What are props in React?
Answer: Props (short for properties) are used to pass data from parent to child components. They are read-only and help make components reusable.
2οΈβ£ What is state in React?
Answer: State is a built-in object used to store dynamic data that affects how the component renders. Unlike props, state can be changed within the component.
3οΈβ£ What are React hooks?
Answer: Hooks like useState, useEffect, and useContext let you use state and lifecycle features in functional components without writing class components.
4οΈβ£ What are directives in Vue.js?
Answer: Directives are special tokens in Vue templates that apply reactive behavior to the DOM. Examples include v-if, v-for, and v-bind.
5οΈβ£ What are computed properties in Vue?
Answer: Computed properties are cached based on their dependencies and only re-evaluate when those dependencies change β great for performance and cleaner templates.
6οΈβ£ What is a component in Angular?
Answer: A component is the basic building block of Angular apps. It includes a template, class, and metadata that define its behavior and appearance.
7οΈβ£ What are services in Angular?
Answer: Services are used to share data and logic across components. Theyβre typically injected using Angularβs dependency injection system.
8οΈβ£ What is conditional rendering?
Answer: Conditional rendering means showing or hiding UI elements based on conditions. In React, you can use ternary operators or logical && to do this.
9οΈβ£ What is the component lifecycle in React?
Answer: Lifecycle methods like componentDidMount, componentDidUpdate, and componentWillUnmount manage side effects and updates in class components. In functional components, use useEffect.
π How do frameworks improve frontend development?
Answer: They offer structure, reusable components, state management, and better performance β making development faster, scalable, and more maintainable.
π¬ Double Tap β€οΈ For More
β
Advanced JavaScript Interview Questions with Answers πΌπ§
1. What is a closure in JavaScript?
A closure is a function that retains access to its outer function's variables even after the outer function returns, creating a private scope.
function outer() {
let count = 0;
return function inner() {
count++;
console.log(count);
}
}
const counter = outer();
counter(); // 1
counter(); // 2
This is useful for data privacy but watch for memory leaks with large closures.
2. Explain event delegation.
Event delegation attaches one listener to a parent element to handle events from child elements via event.target, improving performance by avoiding multiple listeners.
Example:
document.querySelector('ul').addEventListener('click', (e) => {
if (e.target.tagName === 'LI') {
console.log('List item clicked:', e.target.textContent);
}
});
3. What is the difference between == and ===?
β¦ == checks value equality with type coercion (e.g., '5' == 5 is true).
β¦ === checks value and type strictly (e.g., '5' === 5 is false).
Always prefer === to avoid unexpected coercion bugs.
4. What is the "this" keyword?
this refers to the object executing the current function. In arrow functions, it's lexically bound to the enclosing scope, not dynamic like regular functions.
Example: Regular: this changes with call context; Arrow: this inherits from parent.
5. What are Promises?
Promises handle async operations with states: pending, fulfilled (resolved), or rejected. They chain with .then() and .catch().
const p = new Promise((resolve, reject) => {
resolve("Success");
});
p.then(console.log); // "Success"
In 2025, they're foundational for async code but often paired with async/await.
6. Explain async/await.
Async/await simplifies Promise-based async code, making it read like synchronous code with try/catch for errors.
async function fetchData() {
try {
const res = await fetch('url');
const data = await res.json();
return data;
} catch (error) {
console.error(error);
}
}
It's cleaner for complex flows but requires error handling.
7. What is hoisting?
Hoisting moves variable and function declarations to the top of their scope before execution, but only declarations (not initializations).
console.log(a); // undefined (not ReferenceError)
var a = 5;
let and const are hoisted but in a "temporal dead zone," causing errors if accessed early.
8. What are arrow functions and how do they differ?
Arrow functions (=>) provide concise syntax and don't bind their own this, arguments, or superβthey inherit from the enclosing scope.
const add = (a, b) => a + b; // No {} needed for single expression
Great for callbacks, but avoid in object methods where this matters.
9. What is the event loop?
The event loop manages JS's single-threaded async nature by processing the call stack, then microtasks (Promises), then macrotasks (setTimeout) from queues. It enables non-blocking I/O.
Key: Call stack β Microtask queue β Task queue. This keeps UI responsive in 2025's complex web apps.
10. What are IIFEs (Immediately Invoked Function Expressions)?
IIFEs run immediately upon definition, creating a private scope to avoid globals.
(function() {
console.log("Runs immediately");
var privateVar = 'hidden';
})();
Less common now with modules, but useful for one-off initialization.
π¬ Double Tap β€οΈ For Moreβ
JavaScript Essentials β Interview Questions with Answers π§ π»
1οΈβ£ Q: What is the difference between let, const, and var?
A:
β¦ var: Function-scoped, hoisted, can be redeclared.
β¦ let: Block-scoped, not hoisted like var, can't be redeclared in same scope.
β¦ const: Block-scoped, must be assigned at declaration, cannot be reassigned.
2οΈβ£ Q: What are JavaScript data types?
A:
β¦ Primitive types: string, number, boolean, null, undefined, symbol, bigint
β¦ Non-primitive: object, array, function
Type coercion: JS automatically converts between types in operations ('5' + 2 β '52')
3οΈβ£ Q: How does DOM Manipulation work in JS?
A:
The DOM (Document Object Model) represents the HTML structure. JS can access and change elements using:
β¦
document.getElementById()
β¦ document.querySelector()
β¦ element.innerHTML (sets HTML content), element.textContent (sets text only), element.style (applies CSS)
Example: document.querySelector('p').textContent = 'Updated text!';
4οΈβ£ Q: What is event handling in JavaScript?
A:
It allows reacting to user actions like clicks or key presses.
Example:
document.getElementById("btn").addEventListener("click", () => {
alert("Button clicked!");
});
5οΈβ£ Q: What are arrow functions?
A:
A shorter syntax for functions introduced in ES6.
const add = (a, b) => a + b;
π¬ Double Tap β€οΈ For Moreβ
CSS Fundamentals β Interview Questions & Answers π¨π§
1οΈβ£ What is the Box Model in CSS?
The box model describes how elements are rendered:
Content β Padding β Border β Margin
It affects spacing and layout.
2οΈβ£ What's the difference between ID and Class selectors?
β¦ #id: Unique, used once.
β¦ .class: Reusable across multiple elements.
Example:
#header { color: red; }.card { padding: 10px; }
3οΈβ£ How does CSS Specificity work?
Specificity decides which styles are applied when multiple rules target the same element.
Hierarchy:
Inline > ID > Class > Element
Example:
<p id="one" class="two">Text</p>
#one has higher specificity than .two.
4οΈβ£ What is Flexbox?
A layout model for 1D alignment (row or column).
Key properties:
β¦ display: flex
β¦ justify-content, align-items, flex-wrap
5οΈβ£ Difference between Flexbox and Grid?
β¦ Flexbox: 1D layout (row/column).
β¦ Grid: 2D layout (rows & columns).
Use Grid when layout needs both directions.
6οΈβ£ What are Media Queries?
Used to create responsive designs based on screen size/device.
Example:
@media (max-width: 600px) {
body { font-size: 14px; }
}
7οΈβ£ How do you center a div using Flexbox?
{
display: flex;
justify-content: center;
align-items: center;
}
8οΈβ£ What is the difference between position: relative and absolute?
β¦ relative: positions relative to itself.
β¦ absolute: positions relative to nearest positioned ancestor.
9οΈβ£ Explain z-index in CSS.
Controls stacking order of elements. Higher z-index = appears on top.
π How can you optimize CSS performance?
β¦ Minify files
β¦ Use shorthand properties
β¦ Combine selectors
β¦ Avoid deep nesting
β¦ Use external stylesheets
π¬ Double Tap β€οΈ For Moreβ οΈβ οΈβ οΈβ οΈ
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π₯ Programming Language Course.
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π₯ Almost Lesson Are Cleared
π₯ Language Type : JavaScript ( JS )
π§ Duration : 12 HoursβοΈ
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@CodingCoursePro
Shared with Loveβ
π 14-Day Reading/Learning Plan (15 Min Each Day)
* DAY 1. Rich Dad Poor Dad - 15MIN
* DAY 2. Subtle Art of Not Giving a F*ck - 15MIN
* DAY 3. Kaise Nikle Middle Class Life Se Bahar - 15MIN
* DAY 4. The real rich - 15MIN
* DAY 5. Thinking Fast and slow - 15MIN
* DAY 6. 48 laws of power - 15MIN
* DAY 7. Make your bed - 15MIN
* DAY 8. How to win friends and influence people - 15MIN
* DAY 9. Behtar Planning Behtar kaam - 15MIN
* DAY 10. The power of Habit - 15MIN
* DAY 11. 7 Habits of Highly Effective People - 15MIN
* DAY 12. The power of positive thinking - 15MIN
* DAY 13. 12 rules for life - 15MIN
* DAY 14. Atomic habits - 15MIN
Credit goes to @Mr_NeophyteX
Copy with Credit or get copyright banned.
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