The index class of a proxy class is the class that contains the methods and properties for accessing and manipulating the data stored in the proxy object. It’s necessary to have an index class because it provides a standardized interface for working with the data in the proxy object, making it easier for developers to use and maintain.
Without an index class, developers would need to interact directly with the underlying data structures of the proxy object, which can be complex and error-prone. The index class provides a layer of abstraction between the developer and the data, simplifying the development process and reducing the risk of errors. Additionally, the index class can provide additional functionality, such as validation and data transformation, that further improves the usability of the proxy object.