What Is Code Reuse? Code Reuse Best Practices
Code reuse can solve the software growth problems associated with both business and technical challenges. Here we explain what is code reuse and how to reuse code effectively.
Read along or jump ahead to the section that interests you the most:
- How to Ensure Reusability of Code in a Project?
- When Is Code Reuse Not Possible
- Why Software Reuse Is Difficult
- Code Reuse Challenges
- Static Code Analysis Makes It Easy To Reuse Code
What Is Code Reuse?
Code reuse is the practice of using existing code for a new function or software.
But in order to reuse code, that code needs to be high-quality. And that means it should be safe, secure, and reliable.
Developing software that fulfills these requirements is a challenge. Systematically developing high-quality reusable software components and frameworks is even harder.
▶️ Related Resource: Learn how to improve code quality >>>
How to Ensure Reusability of Code in a Project?
Code reuse is a great goal.
In an ideal environment, a developer would be able to access stable and trusted code libraries. They’d then be able to reuse code from those libraries as building blocks within their application.
So, you can reuse code when it can be:
- Easily extended and adapted for the new application.
- Ported to different hardware if needed.
- Shown to be free from defects or problems that affect the reliability, safety, or security of the new application.
But the environment is not always ideal. And code doesn’t always fulfill these requirements. So, reusing code often sounds much easier than it is.
When Is Code Reuse Not Possible?
Code reuse often proves to be difficult.
In practice, developers often end up rebuilding software from scratch. Or they can only reuse a small fraction of existing code in new projects.
Why Software Reuse Is Difficult
Software reuse is difficult. This is especially true for organizations with a large number of product components and geographically distributed development teams.
Here are three reasons software reuse is difficult.
Organization and Scale
As the number of projects and developers increases, it becomes harder to reuse software. It’s a challenge to effectively communicate the details and requirements for code reuse. And it’s difficult to provide adequate guidance and feedback on the reuse of code.
As the number of projects and developers grows, it’s difficult to share libraries of reusable code. It’s a challenge to catalog, archive, and retrieve reusable assets on a global basis.
Platforms such as GitHub can make this easier. But it still takes time and effort to establish a usable and scalable code repository.
Politics and Psychology
At an organizational level, office politics can be a barrier to software reuse. As business units strive for autonomy — or compete amongst themselves — they may try to block reuse of their assets by other units.
At the individual level, developers may view code reuse as stifling their creativity — or as the organization lacking confidence in their technical abilities. Such perceptions lead some developers to resist efforts to increase code reuse.
Code Reuse Challenges
There are both operational and technical challenges with reusing code.
Code Reuse Operational Challenges
Creating reusable code requires an investment of time and resources during development. Truly reusable code can be reused in new ways that differ substantially from the code’s original design intent.
To support planned reuse, development teams need to spend additional time writing documentation for their code. And they need to test it more thoroughly than code slated for just a single project.
This is a challenge for developers with tight deadlines. Some fail because they are overly ambitious. They invest too much in upfront design efforts. Others fail due to poor planning, lack of design flexibility, or lack of funding.
Creating reusable code requires project managers to plan additional resources upfront.
At the outset, project managers must commit to the time needed to design, document, and test code, an investment with long-term benefits. An alternative is a short-term approach in which they focus efforts on quickly designing the software to meet their clients’ deadlines and plan on refactoring the code to be reusable at a later date.
Code Reuse Technical Challenges
Software quality plays a major role in how easily software can be reused.
There are four major traits of software quality that impact reuse.
To be reused, code needs to be secure. You can ensure secure code in a number of ways, including using a CWE list.
To be reused, code needs to be reliable. You can ensure reliable code by ensuring availability, fault tolerance, and recoverability.
To be reused, code needs to be efficient. You can ensure efficiency by improving response times and monitoring processor, memory, and utilization.
To be reused, code needs to be maintainable. One way to ensure that code is maintainable is to ensure it is compliant.
Static Code Analysis Makes Code Reuse Easy
You can use static analysis to reuse code easily. That’s because static analysis improves overall code quality.
Static analysis identifies problems in code early on. It’s performed directly on the source code. This enabling quality checks to be performed well before the code is ready for integration and functional test.
Code quality tools can help spot common flaws in security, design, and program flow. And they can perform data type and variable function checks. These tools often find errors that are not easily detected using other forms of testing.
Static code analysis tools:
- Automate code reviews.
- Reduce cyclomatic complexity.
- Ensure reliability and security.
- Enforce coding standards.
- Improve legacy codebases.
And that makes it easier to reuse code.
Code Reuse Is Easy With Perforce
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