Create valid_palindrome.js

Author: TheCoderSingh

valid_palindrome.js

@@ -0,0 +1,19 @@
+/**
+ * @param {string} s
+ * @return {boolean}
+ */
+var isPalindrome = function(s) {
+    s = s.replace(/[^A-Za-z0-9]/g, '').toLowerCase();
+
+    let left = 0;
+    let right = s.length - 1;
+
+    while(left <= right) {
+        if (s[left] === s[right]) {
+            left++;
+            right--;
+        } else return false;
+    }
+
+    return true;
+};