A palindrome is a word, phrase, number, or other sequence of characters that reads the same forward and backward (ignoring spaces, punctuation, and capitalization). In this tutorial, we'll learn how to check if a string is a palindrome using JavaScript.

What You'll Learn

• How to define a function in JavaScript.
• How to manipulate strings.
• How to use loops for string comparison.
• An alternative method using built-in JavaScript functions.

Step-by-Step Guide

Method 1: Using a Loop

1. Create a Function Start by defining a function called isPalindrome that takes a string as an argument.

2. Clean the Input Inside the function, clean the input string by removing spaces and converting it to lowercase. This step ensures that the function is case-insensitive.

3. Reverse the String Initialize an empty string and use a loop to construct the reverse of the cleaned string.

4. Compare the Strings Finally, compare the cleaned string with the reversed string. If they match, the original string is a palindrome.

Here’s the code for this method:

Method 2: Using Built-in Functions

You can also check for a palindrome using built-in JavaScript functions which can make the code more concise:

Conclusion

In this tutorial, you learned how to check if a string is a palindrome using two different methods in JavaScript. You can choose the method that suits your coding style. Now, you can apply this knowledge to create functional web applications that require string validations!