| V.1 Hello world | Hello world |
| V.2 Types, errors, iterators | A utility that counts words in a file. |
| V.3 Constructors, interfaces, embedding, operators | Discounted satisfies Priced through the promoted and overridden price. |
| V.4 Chains and concurrency | Chains and concurrency |
| V.5 The distributed service "shop" | A service of users, orders and carts; checkout as a saga with an external warehouse and payments; photo upload as a pipeline on a GPU; order events through a topic; live statistics through a topic and a local broadcast. |