April 2026
Intermediate
530 pages
11h 47m
English
Modernizing a legacy system rarely starts with rewriting code. More often, it starts with questioning what should remain stable and what can evolve safely.
In this chapter, we begin with a project that is already clean from an architectural standpoint. The foundations are sound: responsibilities are well separated, dependencies follow clear rules, and the system is testable and understandable. Yet, the technology stack reflects choices made years ago, such as RxSwift (RxSwift is a reactive programming framework for Swift inspired by the ReactiveX family of libraries. It models asynchronous work and data streams using observable sequences, allowing developers to express complex flows ...
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