Function forEachIndexing

forEachIndexing(
    callback?: (
        value?: null | string,
        name?: string,
        index?: number,
    ) => void,
): void
Processes each storage item, with indexing ability
Parameters
- Optionalcallback: (value?: null | string, name?: string, index?: number) => void
  the callback function that processes each storage item
Returns void
Author
David Hsing