Web Development - HTML, CSS & JavaScript

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🎯 16. Object.keys() Returns all keys. console.log(Object.keys(person)); Output: ["name","age"] 🚀 17. Object.values() Returns all values. console.log(Object.values(person)); Output: ["Deepak",25] 🔥 18. Object.entries() Returns key-value pairs. console.log(Object.entries(person)); Output: [["name","Deepak"], ["age",25]] 📦 19. Destructuring Objects Extract values easily.

const person = { name:"Deepak", age:25 };
const { name, age } = person;

⚡ 20. Spread Operator Copy objects.

const person = { name:"Deepak" };
const updated = {...person, city:"Pune" };

🎯 Real Interview Example Array of Objects

const employees = [
    { id:1, name:"John" },
    { id:2, name:"Mike" }
];
console.log(employees[0].name);

Output: John ⭐ Most Important Topics For Interviews 🔥 Arrays 🔥 Objects 🔥 map() 🔥 filter() 🔥 reduce() 🔥 Destructuring 🔥 Spread Operator 🔥 Object.keys() 🔥 Object.values() 🔥 Array of Objects 📝 Mini Practice Questions Easy: ✅ Find largest number in array, ✅ Sum all array elements, ✅ Count array length Medium: ✅ Remove duplicates, ✅ Find second largest number, ✅ Reverse array Advanced: ✅ Group objects by property, ✅ Custom map() method, ✅ Flatten nested arrays Double Tap ❤️ For More ----- 1.59 ₽ · /balance_help

🚀 JavaScript Arrays & Objects — Complete Beginner to Advanced Guide 👨‍💻 Arrays and Objects are the most commonly used data structures in JavaScript. Almost every JavaScript application uses them extensively. Examples: User data, Product lists, API responses, Dashboard data, Shopping carts 📦 PART 1: JavaScript Arrays 🧠 1. What is an Array? An array is used to store multiple values in a single variable. Example:

const fruits = ["Apple", "Mango", "Banana"];

Access Elements: console.log(fruits[0]); Output: Apple Important: Array indexing starts from 0. ⚡ 2. Creating Arrays Method 1: const numbers = [10, 20, 30]; Method 2: const numbers = new Array(10, 20, 30); 🔥 3. Array Methods push() Adds element at the end.

const arr = [1, 2];
arr.push(3);
console.log(arr);

Output: [1, 2, 3] pop() Removes last element. arr.pop(); unshift() Adds element at beginning. arr.unshift(0); shift() Removes first element. arr.shift(); 🔄 4. Loop Through Arrays for Loop

const nums = [1,2,3];
for(let i=0; i<nums.length; i++){
    console.log(nums[i]);
}

for...of

for(let num of nums){
    console.log(num);
}

🎯 5. map() Creates a new array by transforming elements. Example:

const nums = [1,2,3];
const doubled = nums.map(num => num * 2);

console.log(doubled);

Output: [2, 4, 6] 🔥 6. filter() Returns elements matching condition. Example:

const nums = [1,2,3,4,5];
const even = nums.filter(num => num % 2 === 0);
console.log(even);

Output: [2, 4] 🚀 7. reduce() Reduces array to single value. Example:

const nums = [1,2,3,4];
const sum = nums.reduce((total,num) => total + num, 0);

console.log(sum);

Output: 10 🧩 8. find() Returns first matching element.

const users = [10,20,30,40];
const result = users.find(num => num > 20);

console.log(result); 

Output: 30 📋 9. includes() Checks if value exists.

const fruits = ["Apple","Mango"];
console.log(fruits.includes("Apple"));

Output: true 🔥 10. Remove Duplicates

const nums = [1,2,2,3,3];
const unique = [...new Set(nums)];
console.log(unique);

Output: [1, 2, 3] 📦 PART 2: JavaScript Objects 🧠 11. What is an Object? An object stores data in key-value pairs. Example:

const person = {
    name: "Deepak",
    age: 25,
    city: "Bengalore"
};

⚡ 12. Access Object Properties Dot Notation: console.log(person.name); Bracket Notation: console.log(person["name"]); 🔥 13. Add New Property

person.country = "India";
console.log(person);

❌ 14. Delete Property delete person.city; 🔄 15. Loop Through Objects for...in

for(let key in person){
    console.log(key, person[key]);
}

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Coding interview questions with concise answers for software roles: 1️⃣ What happens when you type a URL and hit Enter? Answer: - DNS Lookup → IP address - Browser sends HTTP/HTTPS request - Server responds with HTML/CSS/JS - Browser builds DOM, applies styles (CSSOM), runs JS - Page is rendered 2️⃣ Difference between var, let, and const? Answer: - var: function-scoped, hoisted - let: block-scoped, not hoisted - const: block-scoped, can’t be reassigned 3️⃣ Reverse a String in JavaScript

function reverseString(str) {
  return str.split('').reverse().join('');
}

4️⃣ Find the max number in an array

const max = Math.max(...arr);

5️⃣ Write a function to check if a number is prime

function isPrime(n) {
  if (n < 2) return false;
  for (let i = 2; i <= Math.sqrt(n); i++) {
    if (n % i === 0) return false;
  }
  return true;
}

6️⃣ What is closure in JavaScript? Answer: A function that remembers variables from its outer scope even after the outer function has returned. 7️⃣ What is event delegation? Answer: Attaching a single event listener to a parent element to manage events on its children using event.target. 8️⃣ Difference between == and === Answer: - == checks value (with type coercion) - === checks value + type (strict comparison) 9️⃣ What is the Virtual DOM? Answer: A lightweight copy of the real DOM used in React. React updates the virtual DOM first and then applies only the changes to the real DOM for efficiency. 🔟 Write code to remove duplicates from an array

const uniqueArr = [...new Set(arr)];

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function greet(name, callback) {
    console.log("Hello " + name);
    callback();
}

function done() {
    console.log("Completed");
}

• greet("Deepak", done); Output: • Hello Deepak • Completed 🚀 14. Higher Order Functions Higher Order Functions -> functions that: • Accept functions as arguments • Return functions Example:

function operation(callback) {
    callback();
}

• operation(() => { console.log("Executed"); }); ⚡ 15. Closures Closures -> one of the most important interview topics. A closure -> allows a function to remember variables from its outer scope. Example:

function counter() {
    let count = 0;
    return function() {
        count++;
        console.log(count);
    };
}

const increment = counter();

• increment(); • increment(); Output: • 1 • 2 🎯 16. Recursive Functions Recursive -> a function calling itself. Example:

function countdown(n) {
    if(n === 0) {
        return;
    }
    console.log(n);
    countdown(n - 1);
}

• countdown(5); Output: • 5 • 4 • 3 • 2 • 1 🧮 17. Practical Example — Sum of Array

function sumArray(arr) {
    return arr.reduce((sum, num) => sum + num, 0);
}

console.log(sumArray([1, 2, 3])); Output: • 6 ⭐ Important Interview Topics Focus heavily on: • 🔥 Function Declaration • 🔥 Function Expression • 🔥 Arrow Functions • 🔥 Scope • 🔥 Closures • 🔥 Callback Functions • 🔥 Higher Order Functions • 🔥 Recursion • 🔥 Hoisting 📝 Mini Practice Questions Easy • ✅ Create calculator function • ✅ Find maximum of two numbers • ✅ Check even or odd Medium • ✅ Reverse string • ✅ Find factorial • ✅ Check palindrome Advanced • ✅ Implement debounce • ✅ Implement throttle • ✅ Create custom map() function Double Tap ❤️ For More ----- 1.39 ₽ · /balance_help

🚀 JavaScript Functions — Complete Beginner to Advanced Guide 👨‍💻 Functions -> one of the most important concepts in JavaScript. A function -> a reusable block of code designed to perform a specific task. Why Use Functions? • ✅ Reuse code • ✅ Reduce duplication • ✅ Improve readability • ✅ Make programs modular • ✅ Easier maintenance 🧠 1. What is a Function? Instead of writing the same code multiple times, we -> place it inside a function. Example:

function greet() {
    console.log("Hello World");
}

Calling the Function: • greet(); Output: • Hello World ⚡ 2. Function Declaration The most common way -> create a function. Syntax:

function functionName() {

}

Example:

function welcome() {
    console.log("Welcome to JavaScript");
}

• welcome(); 🔥 3. Function Parameters Parameters -> variables that receive values. Example:

function greet(name) {
    console.log("Hello " + name);
}

• greet("Deepak"); Output: • Hello Deepak 🎯 4. Multiple Parameters

function add(a, b) {
    console.log(a + b);
}

• add(10, 20); Output: • 30 🔄 5. Return Statement return -> sends a value back from a function. Example:

function add(a, b) {
    return a + b;
}

let result = add(10, 20); console.log(result); Output: • 30 🧩 6. Function Expression A function -> stored inside a variable. Example:

const greet = function() {
    console.log("Hello");
};

• greet(); Difference: Concept -> Function Declaration vs Function Expression • Hoisted -> Yes vs Not Hoisted • Defined -> separately vs Stored in variable ⚡ 7. Arrow Functions (ES6) Modern way -> write functions. Traditional Function:

function add(a, b) {
    return a + b;
}

Arrow Function:

const add = (a, b) => {
    return a + b;
};

Short Form:

const add = (a, b) => a + b;

📦 8. Default Parameters Default values -> used when arguments are not passed. Example:

function greet(name = "Guest") {
    console.log(name);
}

• greet(); Output: • Guest 🧠 9. Rest Parameters Rest parameters -> collect multiple arguments into an array. Example:

function sum(...numbers) {
    console.log(numbers);
}

• sum(1, 2, 3, 4); Output: • [1, 2, 3, 4] 🚀 10. Scope in JavaScript Scope -> determines where variables can be accessed. Global Scope

let name = "Deepak";

function show() {
    console.log(name);
}

• Accessible -> everywhere Local Scope

function show() {
    let age = 25;
    console.log(age);
}

• Accessible -> only inside function 🔒 11. Block Scope Variables -> declared using let and const.

if(true) {
    let age = 25;
    console.log(age);
}

Outside block: console.log(age); ❌ Error 🧠 12. What is Hoisting? Hoisting -> JavaScript moves declarations to the top before execution. Example: sayHello();

function sayHello() {
    console.log("Hello");
}

• Works -> because function declarations are hoisted 🔥 13. Callback Functions Callback -> function passed as an argument to another function. Example:

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