[Bug]: Next button throws a runtime error instead of cycling to the first sculpture

Summary

On the State: A Component's Memory page, the Sculpture Gallery example allows users to navigate through sculptures using the Next button. The gallery works correctly while navigating through valid entries, but when the user clicks Next on the final sculpture (12 of 12), the application does not cycle back to the first sculpture.

Instead, the index exceeds the sculpture list bounds, making sculpture undefined and causing the runtime error:

App.js: can't access property "name", sculpture is undefined

Expected: The gallery should wrap around from the last sculpture to the first sculpture when Next is clicked.

Actual: The application throws a runtime error because it attempts to access properties such as sculpture.name on an undefined object.

Affected screen: React.dev → Learn React → Adding Interactivity → State: A Component's Memory → Sculpture Gallery example.

Page

https://react.dev/learn/state-a-components-memory

Details

No response

Öffne die Seite State: A Component's Memory und untersuche das Beispiel Sculpture Gallery. Reproduziere dann den Fehler, indem du bei sculpture 12 of 12 auf Next klickst. Verfolge die Indexaktualisierung des Beispiels und überprüfe, dass die Galerie zur ersten Skulptur zurückkehrt, ohne auf einen undefinierten Eintrag zuzugreifen.