diff --git a/1009.complement-of-base-10-integer.js b/1009.complement-of-base-10-integer.js
new file mode 100644
index 0000000..c118b03
--- /dev/null
+++ b/1009.complement-of-base-10-integer.js
@@ -0,0 +1,18 @@
+/**
+ * URL of this problem
+ * https://leetcode.com/problems/complement-of-base-10-integer/
+ */
+
+/**
+ * @param {number} n
+ * @return {number}
+ */
+var bitwiseComplement = function (n) {
+	const NArr = n.toString(2).split("");
+
+	for (let i = 0; i < NArr.length; i++) {
+		NArr[i] === "0" ? (NArr[i] = "1") : (NArr[i] = "0");
+	}
+
+	return parseInt(NArr.join(""), 2);
+};