The article discusses the importance of separating business logic from side effects in coding by adopting a functional core and imperative shell approach. This method enhances code testability, maintainability, and adaptability by allowing core logic to be tested in isolation, while the imperative shell manages external interactions. An example is provided to illustrate the transition from a mixed logic approach to a structured functional core and imperative shell design.
functional programming ✓
code quality ✓
software design ✓