diff --git a/941.valid-mountain-array.js b/941.valid-mountain-array.js
new file mode 100644
index 0000000..b8a5583
--- /dev/null
+++ b/941.valid-mountain-array.js
@@ -0,0 +1,24 @@
+/**
+ * URL of this problem
+ * https://leetcode.com/problems/valid-mountain-array/
+ */
+
+/**
+ * @param {number[]} arr
+ * @return {boolean}
+ */
+var validMountainArray = function (arr) {
+	let upDown = true;
+
+	if (arr.length < 3 || arr[0] >= arr[1]) return false;
+
+	for (let i = 0; i < arr.length - 1; i++) {
+		if (upDown && arr[i] > arr[i + 1]) {
+			upDown = false;
+		} else if ((!upDown && arr[i] <= arr[i + 1]) || arr[i] === arr[i + 1]) {
+			return false;
+		}
+	}
+
+	return !upDown;
+};