diff --git a/src/half.js b/src/half.js
new file mode 100644
index 0000000..a20d21a
--- /dev/null
+++ b/src/half.js
@@ -0,0 +1,11 @@
+// @ts-check
+
+// import _ from 'lodash';
+
+/**
+ * @param {Number} num
+ */
+export default (num) => {
+    const result = num / 2;
+    return result;
+};