In this chapter, we learned how to avoid the most common errors new Rust programmers encounter, and we found out how Rust performs some operations so that we could take advantage of them.

We saw how to configure the build system to allow for precise compilation. You can now set up the optimization passes, the link-time optimizations, or the panic behavior, among many other things.

You have now also mastered iterators, and are now able to stop indexing slices, gaining valuable computation cycles. You also found out about the Itertools crate, and you can now use it to perform complex operations with iterators.

Finally, you learned a couple of tricks on cyclomatic complexity, and you learned how borrowing or copying can affect the way the program works.

From now on, we will enter the world of more complex issues, which can sometimes be difficult to understand for new developers. We will embrace the full power of the Rust programming language to create fast and safe applications.