From afa51d915e7f595b96d9a2c9bc27d72a0c8af130 Mon Sep 17 00:00:00 2001
From: bel <bel@bel.bel>
Date: Sun, 15 Oct 2023 12:01:35 -0600
Subject: [PATCH] implement transaction.go:Transactions:expenses to return a
 new slice of only the expense transactions

---
 digits-work-sample-go.d/transaction.go | 10 ++++++++++
 1 file changed, 10 insertions(+)

diff --git a/digits-work-sample-go.d/transaction.go b/digits-work-sample-go.d/transaction.go
index c78da9f..de3ab88 100644
--- a/digits-work-sample-go.d/transaction.go
+++ b/digits-work-sample-go.d/transaction.go
@@ -50,6 +50,16 @@ func (trn Transaction) isRefund() bool {
 // Transactions represents a list of Transaction
 type Transactions []Transaction
 
+func (trns Transactions) expenses() Transactions {
+	result := make(Transactions, 0, len(trns))
+	for i := range trns {
+		if !trns[i].isRefund() {
+			result = append(result, trns[i])
+		}
+	}
+	return result
+}
+
 // Sum adds all transactions together.
 func (trns Transactions) Sum() Amount {
 	result := Amount(0.0)