This command will allow you view the id code for blocks and items in Minecraft if you tap them. Usually when we tap something from creative inventory we only see the names but not the ID. This command should useful for those who uses the fill or setblock command, the id code for a spruce plank is plank 1 and dark oak is plank 5, if you do not know this then you should use idname command.
My other idea is add a list of id codes of blocks and items on How to play page. Just in case the idname command is not a good idea.