map_command example

The request has included a map_command five months ago, but lack of some examples. Could you please give an example for how to use and when to use?

Start by locating the map_command definition and the documentation or examples associated with it. Add an example showing how to use map_command and explain when it is appropriate; done means both the usage and intended context are documented. No specific file or test is named in the issue.

Written by the indexing model from the issue text.