Question

In: Computer Science

provide a JavaScript code that finds if the given word by user (prompt) is a Palindrome...

provide a JavaScript code that finds if the given word by user (prompt) is a Palindrome or no.

Solutions

Expert Solution

Please find the code , inline comments and output below.

<!DOCTYPE html>
<html>
<body>

<script>
function Palindrome_check(str){
// Change the string into lower case and remove all non-alphanumeric characters from the string
var new_str = str.toLowerCase().replace(/[^a-zA-Z0-9]+/g,'');
   var count = 0;
// Check whether the string is empty or not . If empty then return //false
   if(new_str==="") {
       return false;
   }
// Check if the length of the string is even or odd
   if ((new_str.length) % 2 === 0) {
       count = (new_str.length) / 2;
   } else {
// If the length of the string is 1 then it becomes a palindrome
       if (new_str.length === 1) {
           return true;
       } else {
// If the length of the string is odd ignore middle character
           count = (new_str.length - 1) / 2;
       }
   }
// Loop through to check the first character to the last character and then move next
   for (var i = 0; i < count; i++) {
// Compare characters and drop them if they do not match
       if (new_str[i] != new_str.slice(-1-i)[0]) {
           return false;
       }
   }
   return true;
}
var word = prompt("Enter the word : ", "");
var result =Palindrome_check(word);
if(result===true){
alert ("The given word is a palindrome");
}
else {
alert ("The given word is not a palindrome");
}

</script>

</body>
</html>

OUTPUT :

venereology answered 3 hours ago
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