From f99685d69ad06dc685c26bc27e0a65c4091688b6 Mon Sep 17 00:00:00 2001
From: SriHarshaDamarla <damarlasriharsha26@gmail.com>
Date: Sat, 9 May 2026 16:19:40 +0530
Subject: [PATCH] update useBill reset value and calculator sum generic
 function

---
 src/hooks/useBill.ts    |  4 ++--
 src/utils/calculator.ts | 10 +++++++---
 2 files changed, 9 insertions(+), 5 deletions(-)

diff --git a/src/hooks/useBill.ts b/src/hooks/useBill.ts
index ebcb3f8..3fe0aeb 100644
--- a/src/hooks/useBill.ts
+++ b/src/hooks/useBill.ts
@@ -58,8 +58,8 @@ export function useBill() {
       title: "New Bill",
       currency: Currency.INR,
       createdAt: new Date(),
-      taxPercent: 18,
-      taxType: TaxType.GST,
+      taxPercent: 0,
+      taxType: TaxType.None,
       items: [],
     });
   }, []);
diff --git a/src/utils/calculator.ts b/src/utils/calculator.ts
index db7896c..9d42345 100644
--- a/src/utils/calculator.ts
+++ b/src/utils/calculator.ts
@@ -14,12 +14,16 @@ export function computeItem(item: BillItem): ComputedBillItem {
   };
 }
 
+export function sumBy<T>(items: T[], getValue: (item: T) => number): number {
+  return items.reduce((sum, currentItem) => sum + getValue(currentItem), 0);
+}
+
 export function computeBill(bill: Bill): ComputedBill {
   const computedItems = bill.items.map(computeItem);
 
-  const subtotal = computedItems.reduce(
-    (sum, item) => sum + item.finalPrice,
-    0,
+  const subtotal = sumBy(
+    computedItems,
+    (computedItem) => computedItem.finalPrice,
   );
 
   const taxAmount = (subtotal * bill.taxPercent) / 100;