The Purpose of Re-Factoring
Monday, May 9th, 2011 - 09:50 - Chapter 2: Agile Methodologies
Refactoring is about reorganization, it comes from mathematics when you factor an expression into an equivalence – the factors are cleaner way of expressing the same statement. Refactoring means equivalence; the original product and the end product must med functionally identical. There are generally two reasons to do refactoring:
- Maintainability – it is easier to fix bugs because the source code is easy to read and the intent is easy to grasp. This might be achieved by removing monolithic routines into a set of individually concise, well-named, single-purpose methods. Or it might be achieved by moving a method to a more appropriate class, or by removing misleading comments.
- Extensibility – it is easier to extend the capabilities of the application if it uses recognizable design patterns.
In order to ensure that the function is identical is common to create a solid set of unit tests. The test should demonstrate that the behavior of the module is correct. If the test fails, you undo the change. Refactoring shall make your code clearer, cleaner, simpler and more elegant.
The book Agile Leadership is about organizing software development and leadership in a knowledge based organization. 
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