1. Using a For Loop:

Problem: Print the numbers from 1 to 5.


for (let i = 1; i <= 5; i++) {
  console.log(i);
}

2. Using a While Loop:

Problem: Print the even numbers from 2 to 10.


let num = 2;
while (num <= 10) {
  console.log(num);
  num += 2;
}

3. Using a Do-While Loop:

Problem: Ask the user to guess a number between 1 and 5. Keep prompting them until they guess correctly.


let secretNumber = 3;
let guess;
do {
  guess = parseInt(prompt("Guess the number (between 1 and 5):"));
} while (guess !== secretNumber);
alert("Congratulations! You guessed it!");

4. Using a For Loop:

Problem: Print the numbers from 10 to 1 in reverse order.


for (let i = 10; i >= 1; i--) {
  console.log(i);
}

5. Using a While Loop:

Problem: Print the first 5 multiples of 3.


let num = 1;
let count = 0;
while (count < 5) {
  if (num % 3 === 0) {
    console.log(num);
    count++;
  }
  num++;
}

6. Using a Do-While Loop:

Problem: Ask the user to enter a positive number. Keep prompting them until they enter a positive number greater than 10.


let userInput;
do {
  userInput = parseInt(prompt("Enter a positive number greater than 10:"));
} while (isNaN(userInput) || userInput <= 10);
alert("Thank you!");

7. Using Nested For Loops:

Problem: Print a simple multiplication table for numbers 1 to 5.


for (let i = 1; i <= 5; i++) {
  for (let j = 1; j <= 5; j++) {
    console.log(i + " x " + j + " = " + (i * j));
  }
}

8. Using a For-In Loop (for Objects):

Problem: Iterate through the properties of an object and print them.


const person = {
  name: "John",
  age: 30,
  city: "New York"
};
for (let key in person) {
  console.log(key + ": " + person[key]);
}