[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

開啟 State: A Component's Memory 頁面並檢查 Sculpture Gallery 範例，然後在 sculpture 12 of 12 上點擊 Next 以重現錯誤。追蹤範例的索引更新，並確認畫廊會返回第一件雕塑，而不會存取未定義的項目。