@@ -0,0 +1,35 @@
+'use strict';
+
+const calculateTotal = (order) => {
+  let total = 0;
+  for (const groupName in order) {
+    const goods = order[groupName];
+    total += goods.reduce((sum, { price }) => (sum + price), 0);
+  }
+  return total;
+};
+
+const purchase = {
+  Electronics: [
+    { name: 'Laptop',  price: 1500 },
+    { name: 'Mouse',  price: 25 },
+    { name: 'Keyboard',  price: 100 },
+    { name: 'HDMI cable',  price: 10 },
+  ],
+  Textile: [
+    { name: 'Bag', price: 50 },
+    { name: 'Mouse pad', price: 5 },
+  ],
+};
+
+const main = async () => {
+  try {
+    console.log(purchase);
+    const total = calculateTotal(purchase);
+    console.log({ total });
+  } catch (err) {
+    console.error(err);
+  }
+};
+
+main();
@@ -0,0 +1,49 @@
+'use strict';
+
+const calculateTotal = (order) => {
+  const items = Array.isArray(order) ? order : Object.values(order);
+  return items.reduce((sum, item) => {
+    if (typeof item.price === 'number') return sum + item.price;
+    else return sum + calculateTotal(item);
+  }, 0);
+};
+
+const purchase = [
+  {
+    Electronics: {
+      Computers: [
+        { name: 'Laptop',  price: 1500 },
+        { name: 'Desktop', price: 1200 },
+      ],
+      Accessories: [
+        { name: 'Mouse',  price: 25 },
+        { name: 'Keyboard',  price: 100 },
+        { name: 'Webcam', price: 50 },
+        [
+          { name: 'HDMI cable', price: 10 },
+          { name: 'USB Hub', price: 20 },
+        ],
+      ],
+    },
+    Textile: [
+      { name: 'Bag', price: 50 },
+      { name: 'Mouse pad', price: 5 },
+      { name: 'Laptop Sleeve', price: 20 },
+    ],
+  },
+  { name: 'T-shirt', price: 15 },
+  { name: 'Cap', price: 12 },
+  { name: 'Jacket', price: 60 },
+];
+
+const main = async () => {
+  try {
+    console.dir(purchase, { depth: null });
+    const total = calculateTotal(purchase);
+    console.log({ total });
+  } catch (err) {
+    console.error(err);
+  }
+};
+
+main();