counting bits solution

Author: byol-han

counting-bits/byol-han.js

@@ -0,0 +1,16 @@
+/**
+ * https://leetcode.com/problems/counting-bits/submissions/1681218194/
+ * @param {number} n
+ * @return {number[]}
+ */
+var countBits = function (n) {
+  const ans = [];
+  for (let i = 0; i <= n; i++) {
+    // Convert i to binary with i.toString(2)
+    // Count 1s by splitting into chars, filtering '1', and getting length
+    const binary = i.toString(2);
+    const onesCount = binary.split('').filter((bit) => bit === '1').length;
+    ans.push(onesCount);
+  }
+  return ans;
+};