OK–more than half way through! In Part 4 of my GraphQL series, let's create some authors out of thin air and publish a few books. Implementing mutations on the server will help us with our whimsical mission.<p>I'll be releasing one part a day for the next week (in case you'd like some holiday travel reading). Here's what you can look forward to.<p>Part 5: Mutations (client implementation)<p>Part 6: Subscriptions (server implementation)<p>Part 7: Subscriptions (client implementation)<p>Have you gotten stuck at any point so far? I would love to get your questions and comments.