Code Refactoring: Meaning, Purpose, Benefits

Most clients want their application to be developed fast, cost-effectively, and reliably. However, in the chase of time and money-saving, quality is often put aside and some quality-improving activities are laid upon a shelf. Refactoring is in a row of such activities and seems to be less tangible as testing for instance. There goes a reasonable question from the client “if it works, why do we need to refactor it?” Still, the necessity of code cleaning up may not be always evident.

What is code refactoring?

Why your application needs refactoring

Maintainability and Extensibility

In general, looking back and organizing the current code before adding new functionalities will not only improve the quality of the application itself, it will make it easier for future developers to build on the source code.

Moreover, when the codebase is unstructured and built inefficiently, developers doubt about making any changes. On the contrary, well-organized and clean code motivates developers to keep order and add improvements.

The metaphor of broken windows suits well to this case. A building with broken windows looks like nobody cares about it. So other people stop caring. They allow more windows to become broken. Eventually, they actively break them. They despoil the facade with graffiti and allow garbage to collect. One broken window starts the process toward decay.

So it is better to prevent any “broken windows” from the very beginning.

Readability

Performance

Costs saving

Consequences of Technical Debt

There are few main high-level consequences caused by accumulated technical debt which keeps building up in the system with time being:

  • new features developed and delivered much slower;
  • knowledge transfer to new developers joining the project is more inefficient;
  • estimates are inaccurate which result in missed deadlines;
  • the client is locked with a software development provider which may hardly be changed.

So sooner or later the debt should be paid off, in order for an application proceeds working and improving.

When refactoring should be considered

Since application’s functionalities do not depend on refactoring and only code changes, a developer himself or a tech lead reviewing the code should define when and what refactoring is necessary. Refactoring is usually irreplaceable if noticing a so-called “code smell” which means disregard of fundamental design principles, weaknesses in code design, duct tape using that all lead to development slowing down, and the risk of bugs or failures growth in the future.

The following points may trigger refactoring activities:

  • The code is hard to read and too bulky;
  • Duplication of code portions is frequently used in an application;
  • The opportunities of existing application should be increased;
  • Lots of featuring conditional operators used in a code.

In opposition to “smelling code” experts use the definition of “clean code” which is the final goal of any quality improvement including refactoring. Thinking from this perspective, refactoring may be considered if there occur missing features of a “clean code” as the following:

  • The logic of code is straightforward which makes it hard for bugs to hide;
  • The dependencies are minimal which simplifies maintenance;
  • Performance is close to optimal without unnecessary optimizations;
  • Clean code contains no duplication and minimizes the number of entities such as classes, methods, functions, and so on.

In general, refactoring may be considered each time adding any improvements or new features to the developed portion of the application.

This may sound weird but another appropriate time to consider refactoring is right after deployment on production and testing an application on real users when it becomes clear if the performance and productivity of the application are sufficient. Moreover after the product delivery to the market, finally there are no strict deadlines, and a development team may take a deep breath and dedicate some time for “housekeeping”.

When refactoring is unnecessary

Another case in which it would be wise to postpone refactoring for some time is if development has some strict deadlines and market delivery timeframes. Refactoring can be like going down the proverbial rabbit hole: Once you start, it might demand more time than expected. Still, the possibility of code refactoring should be reconsidered as soon as the deadline passed.

It’s probably not worth refactoring if your application is not going to extend. On the other hand, if the code is for further usage, there will always be functionalities to be added or updated later, so it makes sense to put the investment into refactoring.

Tips and Tricks

1) Refactoring should be considered before adding new features. As soon as there occurs a requirement to add new functionality or update, it is a good idea to refactor existing code. Of course, this will extend the project’s timeline, but this will also reduce the amount of technical debt that you have to deal with in the future.

2) Refactoring should be planned and estimated carefully. It is important to assess the scope of work needed and to give reasonable estimates of this work in order to stick to the project’s deadlines. Code refactoring may still reveal some unpredictable issues which will demand a longer time than expected, so it is better to put an extra cushion of time into estimates, so that not to ruin expectations regarding the application delivery plan.

3) Refactoring should be accompanied by unit tests. The purpose of refactoring not only to clean up code but to maintain the system working well. So in order to check up, if nothing is broken, unit tests are imperative. As the writing of unit tests demands time as well, it is better to introduce them from the very beginning of the project.

4) QA team should be involved in the refactoring process. As refactoring shouldn’t but still may affect the external behavior of the application, this is relevant to involve the testing team to perform the regression testing of the modified application’s portion and connected parts.

Both unit testing and regression testing should be performed as a part of refactoring efforts. This will ensure that the functionality of the solution was not affected in any way.

The bottom line

The same is true for written code. Keep in mind the necessity of regular cleaning up of your code and you’ll get a higher quality application and a more peaceful and effective work environment.

Originally published at https://sumatosoft.com.

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