Day 4: Loops in JavaScript

Link:
https://courses.chaicode.com/learn/home/30-days-of-Javascript-challenge/30-days-javascript-challenge/section/515627/lesson/3197093

Screenshot:-

Loops are a fundamental concept in programming, allowing us to execute a block of code multiple times. In this article, we will explore different types of loops in JavaScript, including for loops, while loops, do...while loops, nested loops, and loop control statements.

Activity 1: For Loop

Task 1: Print Numbers from 1 to 10

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

This program uses a for loop to print numbers from 1 to 10. The loop starts with i set to 1 and increments i by 1 until it reaches 10.

Task 2: Print the Multiplication Table of 5

for (let i = 1; i <= 10; i++) {
  console.log(`5 x ${i} = ${5 * i}`);
}

This program uses a for loop to print the multiplication table of 5. The loop multiplies 5 by each number from 1 to 10 and logs the result.

Activity 2: While Loop

Task 3: Calculate the Sum of Numbers from 1 to 10

let sum = 0;
let num = 1;

while (num <= 10) {
  sum += num;
  num++;
}

console.log("Sum:", sum);

This program calculates the sum of numbers from 1 to 10 using a while loop. It starts with num set to 1 and adds num to sum until num exceeds 10.

Task 4: Print Numbers from 10 to 1

let count = 10;

while (count >= 1) {
  console.log(count);
  count--;
}

This program prints numbers from 10 to 1 using a while loop. It starts with count set to 10 and decrements count by 1 until it reaches 1.

Activity 3: Do...While Loop

Task 5: Print Numbers from 1 to 5

let num = 1;

do {
  console.log(num);
  num++;
} while (num <= 5);

This program uses a do...while loop to print numbers from 1 to 5. The loop executes the code block first and then checks the condition.

Task 6: Calculate the Factorial of a Number

let number = 5; // You can change this number
let factorial = 1;
let i = 1;

do {
  factorial *= i;
  i++;
} while (i <= number);

console.log(`Factorial of ${number} is ${factorial}`);

This program calculates the factorial of a number using a do...while loop. It multiplies factorial by i until i exceeds the given number.

Activity 4: Nested Loops

Task 7: Print a Pattern

let rows = 5;

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

This program uses nested for loops to print a pattern of asterisks. The outer loop iterates through the rows, and the inner loop builds the pattern for each row.

Activity 5: Loop Control Statements

Task 8: Skip the Number 5

for (let i = 1; i <= 10; i++) {
  if (i === 5) {
    continue;
  }
  console.log(i);
}

This program prints numbers from 1 to 10 but skips the number 5 using the continue statement. When i equals 5, the continue statement skips the current iteration.

Task 9: Stop the Loop at Number 7

for (let i = 1; i <= 10; i++) {
  if (i === 7) {
    break;
  }
  console.log(i);
}

This program prints numbers from 1 to 10 but stops the loop when the number is 7 using the break statement. When i equals 7, the break statement terminates the loop.