If deck is nil, then Copy should return a nil Deck

zchenyu · Apr 25, 2021 · 5aa0bb5 · 5aa0bb5
1 parent e080b3a
commit 5aa0bb5
Showing 1 changed file with 3 additions and 0 deletions.
diff --git a/deck.go b/deck.go
@@ -23,6 +23,9 @@ func NewDeck() *Deck {
 }
 
 func (deck *Deck) Copy() *Deck {
+	if deck == nil {
+		return nil
+	}
 	deck2 := &Deck{
 		cards: make([]Card, len(deck.cards)),
 	}