Is the code reusable? For a few people the response is yes, for other ones is no. I agree with Ocramius that the response is no. An abstraction is reusable, an interface is reusable, but it’s very hard to reuse a final implementation. First of all because when you finish to write it your code is already old, your function is already legacy and you start to maintain it, you search bugs and edge cases.
One of the way to reduce the time dedicated to do refactroring is prevent and defende your code from bad integration, in OOP usually you have a sort of visibility (private, public, protected) and other different way to defend your code, opinable but the ocramius’s talk about Extremly defensive php is good to see.
Refactoring is a methodology to make better your code. There are different improvement topics like readable, performance, solidity.
Test your code before start to change it, you know automation is good but if you love seems a machine to it manually. Setup a continuous integration system, it can be do just one step like run tests but remember to increase that with all steps that you usually do to test the compliance of your code like style, standard, static analysis just to enforce that you are not a machine. Create a good environment and an automatic lifecycle for your application allow you to stay focused on the code and not lost your time around stupid task, remember that when a routine is good the machine fail less respect a human, usually.
Refactoring is one of the best stuff that you can do for other people and to make your feature ready for the real world, usually it’s hard for no-tech company understands it because few times they don’t see any kind of change create a good environment to save time and use it to do refactoring is a godo strategy. Automation is the unique method that I know to do that. There are different layer of automation just to start my 2coins is just put a make file on your codebase and when you do something for the second time stop to write it on your console and write a new make task to share with you team. After that install Jenkins and allow it do run this task for you before put on your on the master branch (for git users, trunk for svn users).
Make your development environment comfortable and increase the conformability’s perception about the lifecycle it’s the best way to do refactoring without the fear to die. If you are fear to die usually you don’t do nothing.
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