Core data is a great API for leveraging local storage requirements, supports objective-oriented declarations, and provides neat functionalities. In a modern application, we might need to have some app extensions such as widget extension or share extension.
Subscript is powerful API for accessing or settings elements of a collection, list, or sequence that can be defined with classes, structures, and enumerations.
SwiftUI previews are powerful tools that help us to see our views live. However, it is tricky to manage local storage-related views with previews, most of the time, you might need to create entity instance to be able to run a preview.