feat: implement getReceipt function to generate order receipt

Author: zilinskyte

Sprint-1/destructuring/exercise-3/exercise.js

@@ -6,3 +6,24 @@ let order = [
   { itemName: "Hot Coffee", quantity: 2, unitPricePence: 100 },
   { itemName: "Hash Brown", quantity: 4, unitPricePence: 40 },
 ];
+
+function getReceipt(order) {
+  let total = 0;
+  let receiptLines = ["QTY ITEM                    TOTAL"];
+  let itemLines = order.map(({ itemName, quantity, unitPricePence }) => {
+    const itemTotal = quantity * unitPricePence;
+    total += itemTotal;
+    const priceInPounds = (itemTotal / 100).toFixed(2);
+
+    const quantityCol = String(quantity).padEnd(3, ' ');
+    const itemCol = itemName.padEnd(20, ' ');
+    const priceCol = `${priceInPounds}`.padStart(6, ' ');
+
+    return `${quantityCol} ${itemCol}  ${priceCol}`;
+  });
+  receiptLines = receiptLines.concat(itemLines);
+   receiptLines.push("");
+  receiptLines.push(`TOTAL: ${(total / 100).toFixed(2)}`);
+  return receiptLines.join('\n');
+}
+console.log(getReceipt(order));