Question

Create a JavaScript program that checks if phrases entered by the user are palindromes.

Answer 1

To check if a phrase entered by the user is a palindrome in JavaScript, use the isPalindrome function. This function compares the phrase with its reverse version by cleaning it and converting it to lowercase. If the cleaned phrase is equal to its reverse, it is a palindrome.

Step-by-step explanation:

To check if a phrase entered by the user is a palindrome, you can write a JavaScript program that compares the phrase with its reverse. Here's an example:

function isPalindrome(phrase) {
var cleanedPhrase = phrase.toLowerCase().replace(/[^a-z0-9]/g, '');
var reversePhrase = cleanedPhrase.split('').reverse().join('');
return cleanedPhrase === reversePhrase;
}

var userPhrase = prompt('Enter a phrase:');
if (isPalindrome(userPhrase)) {
console.log('The phrase is a palindrome!');
} else {
console.log('The phrase is not a palindrome.');
}

In this program, the isPalindrome function takes a phrase as input. It first removes any non-alphanumeric characters and converts the phrase to lowercase. It then creates a reverse version of the cleaned phrase. Finally, it checks if the cleaned phrase is equal to its reverse, and returns true if they are equal, indicating that the phrase is a palindrome.