Thanks for the article. It is like a continuation from the NoSQL tapes. When I saw the video, I wondered how to use the built-in reduce functions. Now it is cle

Thanks for the article. It is like a continuation from the NoSQL tapes. When I saw the video, I wondered how to use the built-in reduce functions. Now it is clear. I also like the use of json.tool to format the output at the command line.