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JavaScript Program to Check Even Number

Updated on Oct 30, 2024
By Mari Selvan
πŸ‘οΈ 140 - Views
⏳ 4 mins
πŸ’¬ 1 Comment
JavaScript Program to Check Even Number

Photo Credit to CodeToFun

πŸ™‹ Introduction

In the realm of programming, dealing with numbers is a fundamental task. One common requirement is checking whether a given number is even or not. An even number is an integer that is exactly divisible by 2 without leaving a remainder.

In this tutorial, we will explore a JavaScript program designed to check whether a given number is even. The program involves using the modulo operator to determine if the number is divisible by 2.

πŸ“„ Example

Let's delve into the JavaScript code that accomplishes this task.

isEven.html
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<!DOCTYPE html>
<html>
<body>

<script>
// Function to check if a number is even
function isEven(number) {
  // If the remainder is zero, the number is even
  return number % 2 === 0;
}

// Driver program
// Replace this value with the number you want to check
const number = 10;

// Call the function to check if the number is even
if (isEven(number)) {
  console.log(`${number} is an even number.`);
} else {
  console.log(`${number} is not an even number.`);
}
</script>

</body>
</html>

πŸ’» Testing the Program

To test the program with different numbers, modify the value of number in the code.

Output
10 is an even number.

🧠 How the Program Works

  1. The program defines a function isEven that takes a number as input and returns true if the number is even, and false otherwise.
  2. Replace the value of number in the main program with the desired number you want to check.
  3. The program calls the isEven function and prints the result using console.log.

πŸ“ Between the Given Range

Let's take a look at the JavaScript code that checks even numbers and outputs them in the specified range.

isEven.js
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// Function to check if a number is even
function isEven(number) {
  return number % 2 === 0;
}

// Function to find even numbers in the range
function findEvenNumbersInRange(start, end) {
  let evenNumbers = [];

  for (let i = start; i <= end; i++) {
    if (isEven(i)) {
      evenNumbers.push(i);
    }
  }

  return evenNumbers;
}

// Driver program
// Define the range
const startRange = 1;
const endRange = 10;

// Call the function to find even numbers in the range
const evenNumbersInRange = findEvenNumbersInRange(startRange, endRange);

// Output the result
console.log(`Even numbers in the range ${startRange} to ${endRange}:`);
console.log(evenNumbersInRange.join(' '));

πŸ’» Testing the Program

Output
Even numbers in the range 1 to 10:
2 4 6 8 10

Run the script to see the even numbers in the range from 1 to 10.

🧠 How the Program Works

  1. The program defines a function isEven that checks if a given number is even.
  2. It then defines a function findEvenNumbersInRange that iterates through a specified range and collects even numbers.
  3. The main part of the program sets the range from 1 to 10 and outputs the even numbers in that range.

🧐 Understanding the Concept of Even Number

Before delving into the code, let's understand the concept of even numbers. An even number is an integer that is exactly divisible by 2.

In other words, when an even number is divided by 2, the remainder is zero.

🎒 Optimizing the Program

While the provided program is straightforward, consider exploring and implementing alternative approaches or optimizations for checking even numbers.

Feel free to incorporate and modify this code as needed for your specific use case. Happy coding!

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Author

author
πŸ‘‹ Hey, I'm Mari Selvan

For over eight years, I worked as a full-stack web developer. Now, I have chosen my profession as a full-time blogger at codetofun.com.

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Mari Selvan
Mari Selvan
10 months ago

If you have any doubts regarding this article (JavaScript Program to Check Even Number) please comment here. I will help you immediately.

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