Code refactoring – a way to optimise an IT project

In today’s dynamic IT world, code quality plays a key role in maintaining software performance and stability. With the expansion of modern and effective projects, there is a growing need for proper source code management and maintenance.

What is code refactoring?

Code refactoring is the process of systematically improving the structure of source code without changing its functionality. The goal of refactoring is to improve the readability and quality of code, which in turn makes it easier to understand, maintain and expand. Unlike rewriting code from scratch, refactoring involves gradually improving existing code.

Long-term projects and the need for refactoring

Long-term IT projects that develop over many months or years tend to become increasingly complex and difficult to manage. As a project grows, the source code often undergoes numerous modifications that can lead to complexity and a chaotic structure. This phenomenon is particularly noticeable in projects managed according to the agile methodology, which emphasises flexibility, iteration and continuous adaptation to changing requirements. For this reason, refactoring becomes an integral part of the software development process, helping teams maintain high code quality and readability.

When should code refactoring be performed?

Many factors may indicate the need for code refactoring. Here are some key situations in which it is worth carrying out this process:

• Low performance – when an application runs slower than expected, which may be due to a complex and suboptimal code structure.
• Difficulties in application development – adding new features becomes increasingly time-consuming and complicated, often due to a chaotic code structure.
• Low code readability – when the code is difficult to understand, both for new team members and its creators, which makes it difficult to modify and maintain.
• Accumulation of temporary solutions – there are many “patches” and temporary solutions in the code that were introduced in a hurry.
• Changing requirements – frequent changes in business or technological requirements lead to complexities in the code that need to be sorted out.
• Testing issues – unit and integration tests are difficult to write or maintain due to the complex structure of the code.
• Analytical tool indications – when static code analysis tools reveal numerous issues with code quality, performance, or security.
• Integration with new libraries and frameworks.
• Development of programming languages and new native functions.
• Improving compliance with new industry standards.
• Application architecture change – changes in application architecture, such as moving from monolithic architecture to microservices, often require significant code refactoring to adapt it to the new structure.
• Increased reliability and availability.

Challenges and risks

Code refactoring is an essential process in the software lifecycle that brings long-term benefits in the form of easier maintenance, better readability and reduced errors. However, it involves risks and many challenges that need to be managed appropriately.

Risks

• Problems can be difficult to identify, especially if there are no adequate tests.
• Customers and stakeholders may be dissatisfied with delays resulting from the refactoring process.
• The project may not meet its planned deadlines.
• Difficulties in justifying the labour and resources devoted to refactoring.
• Possible demotivation of the team if results are not immediately visible.
• Limited resources may not be sufficient to complete all planned tasks.
• Difficulties in prioritising refactoring over other tasks.
• Tests may become outdated and inadequate.
• The need for significant effort to update tests may delay the refactoring process.
• Changes in one module may affect the operation of other modules.

Risk management:

• Implement and maintain a comprehensive set of unit, integration, and automated tests.
• Regularly running tests during refactoring to quickly detect and fix errors.
• Plan refactoring as part of regular iterations in an agile methodology.
• Communicate with stakeholders about the benefits of refactoring and justify its necessity.
• Assessing the criticality of refactoring in the context of the entire project.
• Allocate appropriate resources and prioritise based on the impact on code quality and future maintenance.
• Maintaining consistency – refactoring helps maintain code consistency, both in terms of style and structure.
• Facilitating scalability – a modular and well-designed code structure makes it easier to scale the application.
• Increased developer satisfaction and productivity – working with well-written and readable code is less frustrating and more rewarding for developers.
• Facilitating the onboarding of new team members – new team members can understand and get up to speed with a project more quickly when the code is well organised and readable, reducing the time needed for learning and adaptation.
• Increased compliance with best practices – regular refactoring allows for the implementation of best practices and design patterns, which improves the overall quality of the code and compliance with industry standards.
• Improved application security – refactoring provides an opportunity to identify and eliminate potential security vulnerabilities, which can increase data protection and compliance with legal requirements.
• Facilitating long-term code maintenance – structural changes introduced during refactoring make the code easier to maintain, reducing the costs and efforts associated with its future maintenance.
• Preparation for future technologies – by refactoring the code, you can better prepare for integration with new technologies and tools, allowing for easier adoption of new solutions in the future.
• Increased application stability – by removing complex and unstable code fragments, refactoring can increase application stability, leading to fewer crashes and production issues.
• Better code documentation – the refactoring process often involves updating documentation, ensuring that it is up to date and reflects the actual state of the code, making it easier to understand and further develop.
• Increased confidence in the change implementation process – better code quality and testability increase the team’s confidence in making changes, which can speed up the release cycle and reduce concerns about deploying a new version of the application.
• Mapping dependencies and understanding their impact on the project.
• Using modularity techniques to minimise the impact of changes on other parts of the system.

Code refactoring techniques

Code refactoring is a process that involves various techniques aimed at improving code quality and facilitating its development and maintenance. Here are some examples of refactoring techniques:

• Renaming: changing the names of variables, functions, methods, classes, and other code elements to more descriptive and understandable ones.
• Extract Method: extracting a piece of code into a new, standalone method or function.
• Remove Duplicates: identifying and eliminating repetitive code fragments by moving them to a common method or class.
• Introducing Design Patterns: applying appropriate design patterns (e.g. Singleton, Factory, Observer) to solve typical structural and behavioural problems.
• Refactor Tests: improving the structure and readability of unit and integration tests, eliminating repetitions and applying design patterns in tests.

Advantages of code refactoring

Code refactoring brings numerous benefits that significantly affect the quality and efficiency of the software development process. Here are the most important ones:

• Better code readability – refactoring makes the code more transparent and understandable for programmers.
• Ease of making changes – refactoring makes the code structure more modular and flexible, which makes it easier to add new features and modify existing ones.
• Reduction of errors – removing duplication, simplifying complex structures and improving code testability leads to a reduction in the number of errors.
• Increased performance – optimising code during refactoring can lead to improved performance.
• Prevention of technical debt – technical debt is a concept that describes the costs of maintaining and developing code resulting from its quality. When a project is developing rapidly, delivering new features often takes priority over code cleanliness. Regular refactoring is a strategy to prevent the accumulation of technical debt, which could significantly slow down the development of the project in the future.

Refactoring as a natural part of software development

The question often arises as to whether the need for refactoring is a sign of failures and mistakes made in earlier stages of the project. In fact, it is a natural part of the software life cycle for several reasons. First, design requirements may change, making solutions that were optimal at the beginning insufficient. Secondly, technological advances bring new tools and patterns that can improve the design. Thirdly, the growing complexity of the project requires simplification of the code to facilitate its management and maintenance. Finally, regular refactoring helps maintain high code quality and improves the readability, testability, stability, and scalability of the application. Therefore, refactoring is a natural and often unavoidable part of the software development process.

Refactoring – summary

In summary, refactoring is an integral part of long-term IT projects. It allows you to adapt to changing requirements, introduce new technologies and improve the security of your application. It makes the code more transparent, easier to modify, less prone to errors and more efficient. All this translates into faster software development, better quality and stability of the final product, and greater satisfaction for both software users and the development team itself.