Merge pull request neetcode-gh#1288 from Pho3b/patch-2

Update: 9-Palindrome-Number.js

javascript/9-Palindrome-Number.js

@@ -19,3 +19,26 @@ var isPalindrome = function (x) {
 
 // Runtime: 302 ms, faster than 40.50% of JavaScript online submissions for Palindrome Number.
 // Memory Usage: 51.8 MB, less than 8.36% of JavaScript online submissions for Palindrome Number.
+
+/**
+ * Reverse Integer Using Modulo
+ * Time O(N) | Space O(1)
+ * https://leetcode.com/problems/palindrome-number/
+ * @param {number} x
+ * @return {boolean}
+ */
+ var isPalindrome = function(x) {
+ if (x < 0) return false;
+
+ const inputX = x;
+ let revX = 0;
+
+ while (x > 0) {
+ revX += x % 10;
+ x = Math.floor(x / 10);
+
+ if (x > 0) revX *= 10
+ }
+
+ return revX === inputX;
+};