How To Write Palindrome In Javascript

Creating palindromes in JavaScript can be a fun and creatively stimulating coding challenge. So, what exactly is a palindrome? A palindrome is a word, phrase, number, or other sequence of characters which reads the same backward as forward. Now, let's dive into how you can write a simple palindrome function in JavaScript.

To start, let's define a function called "isPalindrome" that will take a string as an input parameter. This function will check if the given string is a palindrome or not. Here's a step-by-step guide to implementing this function:

1. Remove non-alphanumeric characters: The first step is to remove any non-alphanumeric characters from the input string. You can achieve this using regular expressions. Here's an example code snippet to achieve this:

function isPalindrome(str) {
  const alphanumericStr = str.toLowerCase().replace(/[^a-z0-9]/g, '');
}

2. Reverse the sanitized string: Next, you need to reverse the sanitized string. One way to reverse a string is by converting it to an array, reversing the array, and then joining it back into a string. Here's how you can do it:

function isPalindrome(str) {
  const alphanumericStr = str.toLowerCase().replace(/[^a-z0-9]/g, '');
  const reversedStr = alphanumericStr.split('').reverse().join('');
}

3. Check if the original and reversed strings are equal: Finally, compare the original sanitized string with its reversed version to determine if it's a palindrome. If the strings are equal, the input string is a palindrome. Here's the complete "isPalindrome" function:

function isPalindrome(str) {
  const alphanumericStr = str.toLowerCase().replace(/[^a-z0-9]/g, '');
  const reversedStr = alphanumericStr.split('').reverse().join('');
  return alphanumericStr === reversedStr;
}

Now that you have the "isPalindrome" function ready, you can test it with different strings to see if it correctly identifies palindromes. Here's how you can use the function:

console.log(isPalindrome('A man, a plan, a canal, Panama')); // Output: true
console.log(isPalindrome('Hello, World!')); // Output: false

In the first test case, the function correctly identifies "A man, a plan, a canal, Panama" as a palindrome, returning true. In the second test case, the function correctly identifies "Hello, World!" as not a palindrome, returning false.

By following these steps and understanding the logic behind checking for palindromes in JavaScript, you can enhance your coding skills and have fun experimenting with different strings to test for palindromes. Happy coding!