You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
38 lines
1.4 KiB
JavaScript
38 lines
1.4 KiB
JavaScript
// Write a JavaScript function that checks whether a passed string is palindrome or not?
|
|
|
|
function check_Palindrome(str_entry){
|
|
// Change the string into lower case and remove all non-alphanumeric characters
|
|
var cstr = str_entry.toLowerCase().replace(/[^a-zA-Z0-9]+/g,'');
|
|
var ccount = 0;
|
|
// Check whether the string is empty or not
|
|
if(cstr==="") {
|
|
alert("Nothing found!");
|
|
return false;
|
|
}
|
|
// Check if the length of the string is even or odd
|
|
if ((cstr.length) % 2 === 0) {
|
|
ccount = (cstr.length) / 2;
|
|
} else {
|
|
// If the length of the string is 1 then it becomes a palindrome
|
|
if (cstr.length === 1) {
|
|
alert("Entry is a palindrome.");
|
|
return true;
|
|
} else {
|
|
// If the length of the string is odd ignore middle character
|
|
ccount = (cstr.length - 1) / 2;
|
|
}
|
|
}
|
|
// Loop through to check the first character to the last character and then move next
|
|
for (var x = 0; x < ccount; x++) {
|
|
// Compare characters and drop them if they do not match
|
|
if (cstr[x] != cstr.slice(-1-x)[0]) {
|
|
alert("Entry is not a palindrome.");
|
|
return false;
|
|
}
|
|
}
|
|
alert("The entry is a palindrome.");
|
|
return true;
|
|
}
|
|
check_Palindrome('madam');
|
|
check_Palindrome('nurses run');
|
|
check_Palindrome('fox');
|