From d0e812a730363cd6fc8a9c2e2026c87244541060 Mon Sep 17 00:00:00 2001
From: Aadhavan Srinivasan <aadhavan@twomorecents.org>
Date: Thu, 24 Oct 2024 17:34:03 -0400
Subject: [PATCH] Return error if stack is empty

---
 sliceQueue.go | 9 +++++++--
 1 file changed, 7 insertions(+), 2 deletions(-)

diff --git a/sliceQueue.go b/sliceQueue.go
index ba68ebd..d54c8f6 100644
--- a/sliceQueue.go
+++ b/sliceQueue.go
@@ -1,8 +1,13 @@
 package main
 
+import "errors"
+
 // Helper functions for slices, to make them behave more like stacks
-func peek[T any](s []T) T {
-	return s[len(s)-1]
+func peek[T any](s []T) (T, error) {
+	if len(s) < 1 {
+		return *new(T), errors.New("Stack empty")
+	}
+	return s[len(s)-1], nil
 }
 
 func pop[T any](sp *[]T) T {