diff --git a/number-of-1-bits/Kyojin-Hwang.js b/number-of-1-bits/Kyojin-Hwang.js
new file mode 100644
index 000000000..1a3965103
--- /dev/null
+++ b/number-of-1-bits/Kyojin-Hwang.js
@@ -0,0 +1,10 @@
+/**
+ * @param {number} n
+ * @return {number}
+ */
+var hammingWeight = function (n) {
+  return n
+    .toString(2)
+    .split("")
+    .filter((bit) => bit === "1").length;
+};
diff --git a/valid-palindrome/Kyojin-Hwang.js b/valid-palindrome/Kyojin-Hwang.js
new file mode 100644
index 000000000..84da73ec4
--- /dev/null
+++ b/valid-palindrome/Kyojin-Hwang.js
@@ -0,0 +1,20 @@
+/**
+ * @param {string} s
+ * @return {boolean}
+ */
+var isPalindrome = function (s) {
+  const cleaned = s.replace(/[^a-z0-9]/gi, "").toLowerCase();
+
+  let left = 0;
+  let right = cleaned.length - 1;
+
+  while (left < right) {
+    if (cleaned[left] !== cleaned[right]) {
+      return false;
+    }
+    left++;
+    right--;
+  }
+
+  return true;
+};