Summary

In this chapter, we visited multiple forms of the Operation Result pattern, from an augmented Boolean to a complex data structure containing messages, values, and success indicators. We also explored static factories and private constructors to control external access. Furthermore, after all that exploration, we only scratched the surface of the almost endless possibilities surrounding how to design the resulting object returned by the operation method. Each specific use case should dictate how to make it happen. From here, I am confident you have enough information about the pattern to explore the many possibilities yourself, and I highly encourage you to.

The Operation Result pattern is perfect for crafting strongly typed return values that self-manage multiple states (error and success) or support complex states (like partial success). It is also ideal for transporting messages that are not necessarily errors, like information messages. Even in its simplest form, we...