Summary

In this chapter, we touched upon immutability in Go. We took a small refresher on how immutability works in Go, by either pass-by-value or pass-by-reference. We learned that pointers do not guarantee that your code will be more performant than if you avoid them. We also discussed some of the benefits of immutable code, such as improving the readability and understandability of the code base. We also touched on how this makes concurrency easier to implement correctly, as the state is not mutated between functions.

Finally, we wrapped up the discussion of pure functions that we started in the previous chapter by looking at monads and a practical implementation thereof with the Maybe monad.

In the next chapter, we will explore some must-have functions for writing code functionally.