added a palindrome.js file

Author: hirentimbadiya

0001 Palindrome ( L - I)/palindrome.js

@@ -0,0 +1,44 @@
+let n = 12321;
+
+if(palindrome(n)){
+    console.log( n + " is a Palindrome number");
+}else{
+    console.log( n + " is not a Palindrome number");
+}
+
+/* function to check if a number is palindrome or not 
+by reversing the number and comparing it with the original number */
+function palindrome(n){
+    // create a temp variable to store the value of n
+    let temp = n;
+    // create a variable to store the reverse of n
+    let rev = 0;
+    // reverse the number
+    while(temp > 0){
+        let lastDigit = temp % 10;
+        rev = rev * 10 + lastDigit;
+        temp = Math.floor(temp / 10);
+    }
+    // check if the reverse is equal to n
+    return rev == n;
+}
+
+// using two pointers
+function palindromeTwoPointer(n){
+    // convert the number to string
+    let str = n.toString();
+    // create two pointers
+    let start = 0;
+    let end = str.length - 1;
+    // loop through the string
+    while(start < end){
+        // check if the characters at the two pointers are equal
+        if(str[start] != str[end]){
+            return false;
+        }
+        // increment start and decrement end
+        start++;
+        end--;
+    }
+    return true;
+}