diff --git a/2620.counter.js b/2620.counter.js
new file mode 100644
index 0000000..08a8815
--- /dev/null
+++ b/2620.counter.js
@@ -0,0 +1,21 @@
+/**
+ * URL of this problem
+ * https://leetcode.com/problems/counter/
+ */
+
+/**
+ * @param {number} n
+ * @return {Function} counter
+ */
+var createCounter = function (n) {
+	return function () {
+		return n++;
+	};
+};
+
+/**
+ * const counter = createCounter(10)
+ * counter() // 10
+ * counter() // 11
+ * counter() // 12
+ */