Question

Palindrome Javascript

I am trying to write this javascript function to check if a number is Palindrome..

Palindrome means - a word, phrase, or sequence that reads the same backward as forward, e.g., madam or nurses run.

This is the code i have, but it doesnt work.

Code:

let convertButton = document.getElementsByClassName("btn")[0];

let userInput = document.getElementById("number").value;

let results = document.getElementById("result").value;

convertButton.addEventListener("click", function (event) {

event.preventDefault();

console.log(userInput);

if (validatePalidrome(userInput))

document.getElementById("result").innerHTML = "true";

else document.getElementById("result").innerHTML = "false";

});

function validatePalidrome(numbers) {

let userStringArray = userInput.split("");

let reverseUserInput = userStringArray.reverse();

let joinReverseString = reverseUserInput.join("");

if (userInput.localeCompare(joinReverseString) === 0) {

return true;

}

return false;

}

Answer 1

According to the given code,

Your approach is effiecient and good but needs a slight modification.

Including that modification, I have written the palindrom function using JavaScript.

Below are the Snippets:

Code Snippet:

Output Snippet:

String to be passed: mam, returns true

String to be passed: hi, returns False

Code in Text format:

function validatePalidrome(numbers)                                       // getting inputString in numbers variable
{

   let userStringArray = numbers.split('');                           // converting string to array      
  
   let reverseUserInput = userStringArray.reverse();                   // reversing the elements in the array

   let joinReverseString = reverseUserInput.join('');                   // again joining them as a string

   if (numbers == joinReverseString)                                   // comparing the string with original string in numbers
   {

       return true;                                                   // returns true if it is a palindrome

   }
   else
   {

       return false;                                                   // returns false if it is not a palindrome

   }
}

I hope the above snippets, information, and the explanation will help you out!

Please comment if you have any queries/errors!

Thank you!