From 4f9e220638ea62443db25d252c4e12ede2c7f9c5 Mon Sep 17 00:00:00 2001
From: Sam Anthony <sam@samanthony.xyz>
Date: Sun, 1 Oct 2023 20:02:22 -0400
Subject: error handling and tidying

---
 stack.go | 12 +++++++++---
 1 file changed, 9 insertions(+), 3 deletions(-)

(limited to 'stack.go')

diff --git a/stack.go b/stack.go
index 182d418..1a52e94 100644
--- a/stack.go
+++ b/stack.go
@@ -6,11 +6,17 @@ func (s *Stack) push(v float64) {
 	*s = append(*s, v)
 }
 
-func (s *Stack) pop() *float64 {
+func (s *Stack) pop() (float64, error) {
 	if len(*s) > 0 {
 		v := (*s)[len(*s)-1]
 		*s = (*s)[:len(*s)-1]
-		return &v
+		return v, nil
 	}
-	return nil
+	return 0, EmptyStackErr{}
+}
+
+type EmptyStackErr struct{}
+
+func (e EmptyStackErr) Error() string {
+	return "empty stack"
 }
-- 
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