Html and Css & Jsآموزش: “✅ JavaScript Practice Questions – Part 2 💻🔥 🔍 Q1. Swap two variable…”

✅ JavaScript Practice Questions – Part 2 💻🔥

🔍 Q1. Swap two variables without a third variable.
✅ Answer:

let a = 5, b = 10;
[a, b] = [b, a];
console.log(a, b);  // Output: 10 5

🔍 Q2. Find the largest number in an array.
✅ Answer:

let numbers = [3, 7, 2, 9, 5];
let max = Math.max(...numbers);
console.log(max);  // Output: 9

🔍 Q3. Check if a number is prime.
✅ Answer:

function isPrime(n) {
  if (n <= 1) return false;
  for (let i = 2; i <= Math.sqrt(n); i++) {
    if (n % i === 0) return false;
  }
  return true;
}

console.log(isPrime(7));  // Output: true

🔍 Q4. Count vowels in a string.
✅ Answer:

function countVowels(str) {
  return str.match(/[aeiou]/gi)?.length || 0;
}

console.log(countVowels("Hello World"));  // Output: 3

🔍 Q5. Convert first letter of each word to uppercase.
✅ Answer:

let sentence = "hello world";
let titleCase = sentence.split(" ").map(word => word.charAt(0).toUpperCase() + word.slice(1)).join(" ");

console.log(titleCase);  // Output: Hello World

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