move receipt string building to a helper function

Author: RaihanSharif

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

@@ -7,18 +7,28 @@ let order = [
   { itemName: "Hash Brown", quantity: 4, unitPricePence: 40 },
 ];
 
-function printReceipt(order) {
+// helper function that pads each item in a line by a certain amount
+function getReceiptString(quantity, itemName, total) {
   const qtyWidth = 8;
   const itemWidth = 20;
 
-  console.log(`${"QTY".padEnd(8)}${"ITEM".padEnd(20)}TOTAL`);
+  return `${String(quantity).padEnd(qtyWidth)}${itemName.padEnd(itemWidth)}${total}`;
+}
+
+function printReceipt(order) {
+  // print header
+  console.log(getReceiptString("QTY", "ITEM", "TOTAL"));
+
   let total = 0;
+
+  // print each line item
   order.forEach(({ quantity, itemName, unitPricePence }) => {
-    console.log(
-      `${String(quantity).padEnd(qtyWidth)}${String(itemName).padEnd(itemWidth)}${((quantity * unitPricePence) / 100).toFixed(2)}`
-    );
+    const price = ((quantity * unitPricePence) / 100).toFixed(2);
+    console.log(getReceiptString(quantity, itemName, price));
     total += quantity * unitPricePence;
   });
+
+  // print total
   console.log(`\nTotal: ${(total / 100).toFixed(2)}`);
 }