Exploring Extreme Programming
Your code sometimes evolves to have two or more arrays operating in parallel. If these arrays work in lockstep, it might be better to have one array with objects instead. Let’s look at an example refactoring from one to the Continue reading Refactor: Parallel Arrays to Array of Objects
“If” statements often attract complexity. They gather compound conditions that are hard to understand. More “if” statements get nested inside. It gets hard to know under what conditions any bit of code will run. “Duplicate and Customize” is a refactoring Continue reading Refactor: Duplicate and Customize
When a “raw” type appears in a protocol, it encourages it to spread all over. Recently, I needed to encapsulate a type: I had used “array of integer” ([Int]) in a number of places, and I wanted to change this Continue reading Refactor: Change Signature on a Protocol [Interface]
For most problems, we have a choice: implement current needs only, or generalize the solution to more easily handle variations we expect to need in the future. The evolutionary design community refers to the latter approach as speculative generality, and Continue reading Speculative Generality
This post summarizes the material on xp123.com related to refactoring in Swift. Swift Refactorings Divide Class into Class + Extension Extract Protocol Other Refactoring-Related Material Refactoring – articles tagged on xp123.com Resources on Refactoring – pointers to other sites’ materials
Context: You have a class that implements one or more protocols. The class has become long, and it’s confusing to understand what parts are there for the protocols, and what parts are for the class’ internal needs. Solution: Divide the Continue reading Divide Class into Class + Extension (Swift Refactoring)
Extract Protocol lets us generalize our types. Context: You have a class (or other entity), and want to let another class stand in for it in some cases. You could make the other class a subclass. But this couples the Continue reading Extract Protocol Refactoring (Swift) – Elevate Common Behavior
Refactoring – “improving the design of existing code without changing its behavior” – is a key skill in developing software. These resources can help you improve.
This article (originally published in Better Software) explores generalization in TDD. The basic notion is that refactoring sets out to not change the behavior of code for any of its inputs, but TDD sets out to change behavior (in the Continue reading Refactoring and Generalization in TDD
When you clean up code, you often need refactorings that aren’t in any tool, and aren’t in Martin Fowler’s Refactoring catalog. You’re on your own. When this happens, think like a language lawyer and a logician. Language Lawyer and Logician Continue reading Home-Grown Refactorings – Be Careful!