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✅ JavaScript Practice Questions with Answers 💻⚡ 🔍 Q1. How do you check if a number is even or odd?

    
        let num = 10;
if (num % 2 === 0) {
  console.log("Even");
} else {
  console.log("Odd");
}{}

🔍 Q2. How do you reverse a string?

    
        let text = "hello";
let reversedText = text.split("").reverse().join("");
console.log(reversedText);  // Output: olleh{}

🔍 Q3. Write a function to find the factorial of a number.

    
        function factorial(n) {
  let result = 1;
  for (let i = 1; i <= n; i++) {
    result *= i;
  }
  return result;
}
console.log(factorial(5));  // Output: 120{}

🔍 Q4. How do you remove duplicates from an array?

    
        let items = [1, 2, 2, 3, 4, 4];
let uniqueItems = [...new Set(items)];
console.log(uniqueItems);{}

🔍 Q5. Print numbers from 1 to 10 using a loop.

    
        for (let i = 1; i <= 10; i++) {
  console.log(i);
}{}

🔍 Q6. Check if a word is a palindrome.

    
        let word = "madam";
let reversed = word.split("").reverse().join("");
if (word === reversed) {
  console.log("Palindrome");
} else {
  console.log("Not a palindrome");
}{}

💬 Tap ❤️ for more!

1347

20:49

05.12.2025

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𝗗𝗮𝘁𝗮 𝗦𝗰𝗶𝗲𝗻𝗰𝗲 & 𝗠𝗮𝗰𝗵𝗶𝗻𝗲 𝗟𝗲𝗮𝗿𝗻𝗶𝗻𝗴 𝗙𝗥𝗘𝗘 𝗠𝗮𝘀𝘁𝗲𝗿𝗰𝗹𝗮𝘀𝘀😍 Kickstart Your Data Science Career This Masterclass will help you build a strong foundation in Data Science Eligibility :- Students ,Freshers & Working Professionals 𝗥𝗲𝗴𝗶𝘀𝘁𝗲𝗿 𝗙𝗼𝗿 𝗙𝗥𝗘𝗘👇:- https://pdlink.in/3XDI0ie Date & Time:- 5th Dec 2025 ,7PM

1515

08:34

05.12.2025

✅ 🔤 A–Z of Full Stack Development A – Authentication Verifying user identity using methods like login, tokens, or biometrics. B – Build Tools Automate tasks like bundling, transpiling, and optimizing code (e.g., Webpack, Vite). C – CRUD Create, Read, Update, Delete – the core operations of most web apps. D – Deployment Publishing your app to a live server or cloud platform. E – Environment Variables Store sensitive data like API keys securely outside your codebase. F – Frameworks Tools that simplify development (e.g., React, Express, Django). G – GraphQL A query language for APIs that gives clients exactly the data they need. H – HTTP (HyperText Transfer Protocol) Foundation of data communication on the web. I – Integration Connecting different systems or services (e.g., payment gateways, APIs). J – JWT (JSON Web Token) Compact way to securely transmit information between parties for authentication. K – Kubernetes Tool for automating deployment and scaling of containerized applications. L – Load Balancer Distributes incoming traffic across multiple servers for better performance. M – Middleware Functions that run during request/response cycles in backend frameworks. N – NPM (Node Package Manager) Tool to manage JavaScript packages and dependencies. O – ORM (Object-Relational Mapping) Maps database tables to objects in code (e.g., Sequelize, Prisma). P – PostgreSQL Powerful open-source relational database system. Q – Queue Used for handling background tasks (e.g., RabbitMQ, Redis queues). R – REST API Architectural style for designing networked applications using HTTP. S – Sessions Store user data across multiple requests (e.g., login sessions). T – Testing Ensures your code works as expected (e.g., Jest, Mocha, Cypress). U – UX (User Experience) Designing intuitive and enjoyable user interactions. V – Version Control Track and manage code changes (e.g., Git, GitHub). W – WebSockets Enable real-time communication between client and server. X – XSS (Cross-Site Scripting) Security vulnerability where attackers inject malicious scripts into web pages. Y – YAML Human-readable data format often used for configuration files. Z – Zero Downtime Deployment Deploy updates without interrupting the running application. 💬 Double Tap ❤️ for more! This A–Z covers foundational and advanced topics noted in 2025 developer roadmaps from AxiomPro and FreeCodeCamp—mastering these gives you a full-stack edge. What letter or topic do you want to explore next? 😊

1689

19:57

04.12.2025

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1628

17:10

04.12.2025

✅ Advanced JavaScript Interview Questions with Answers 💼🧠 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 ===? ⦁ == checks value equality with type coercion (e.g., '5' == 5 is true). ⦁ === 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 super—they 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 → Microtask queue → 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. 💬 Double Tap ❤️ For More

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