diff --git a/bangdori/Best Time to Buy and Sell Stock.js b/bangdori/Best Time to Buy and Sell Stock.js
new file mode 100644
index 0000000..4332328
--- /dev/null
+++ b/bangdori/Best Time to Buy and Sell Stock.js	
@@ -0,0 +1,18 @@
+/**
+ * @param {number[]} prices
+ * @return {number}
+ */
+var maxProfit = function (prices) {
+  let buyPrice = Infinity;
+  let maxProfit = 0;
+
+  for (const price of prices) {
+    if (buyPrice > price) {
+      buyPrice = price;
+    } else {
+      maxProfit = Math.max(maxProfit, price - buyPrice);
+    }
+  }
+
+  return maxProfit;
+};