Modular programming is a large-scale application of the principles of object-oriented design and decomposition. It is an approach to software development that focuses on code clarity, readability, and testability by breaking down complex code into smaller, individual modules that can be independently tested and integrated together.
Modular programming helps developers achieve greater code reuse and faster builds by reducing complexity, managing dependencies, and focusing on single-responsibility modules. A program is said to be modular if it consists of a collection of self-contained subroutines called modules. A program designed around such modules is known as a modular program. A well-designed modular program requires few source files and has little or no redundancy in its source code.
In this blog post, we will look at seven reasons why you should consider modular programming while developing your next software project.
1. You can easily understand and change your code later
If your code is well-organized and modular, you will be able to understand, debug, and make changes to it as needed. If your code is poorly organized, it will be much harder to understand, debug, and make changes to it. For example, you might want to add a new feature to an existing program, but if the code is poorly organized, it will be much harder to do so.
In a modular software program, you simply drop in the new feature and you’re good to go. In a non-modular software program, you have to find somewhere in the existing code where you can plug in the new feature, which is often much harder to do. Modular code is organized so that each piece of code has a single purpose and is never used by any other code. This makes it easier to understand what each bit of code does, which in turn makes it easier for you to make changes to it.
2. Your code is easier to test
If you’re developing a new software product, chances are you’ll want to test it before releasing it to the world. The more modular your code is, the easier it will be to write tests for it. If you have large, non-modular chunks of code, testing is going to be much more difficult. You can test smaller modules more easily since they are self-contained and don’t rely on other modules.
This makes it easier to ensure that your individual pieces of code work correctly and doesn’t rely on any other code. When you have a large amount of interdependent code, testing gets much more difficult. For example, you might have a few different pieces of code that need to work together to perform a given task. When testing this code, you might find that one or more of the pieces of code that you need to test is dependent on other code that you can’t test. If your code is modular, you can test each individual piece of code in isolation, which makes it much easier to test your code.
3. Your code will be more reliable
If there are fewer dependencies in your code, your code will be more reliable. If there are fewer modules in your program, the likelihood that each of these modules will fail is reduced. This is because there are fewer modules to go wrong and each module is simpler. A reduction or elimination of interdependencies between modules also helps reduce the likelihood of a failure.
If a given module fails, it does not affect any of the other modules. If there are many interdependencies between modules, one failed module can cause many other modules to fail. With modular programming, the design of the program reflects the design of the modules. This makes the program more reliable since the modules are simpler, more robust, less interdependent, and more likely to perform correctly.
4. You’ll have better build times
Modular programming focuses on creating smaller, more discrete modules, which are fairly independent of each other. This makes it easier to “build” your program, which is the process of compiling your code and creating executable binaries. If your code is well-organized, it’s easier to group your code into those discrete modules. This means you’ll have less code to compile, which will make it easier for your computer to compile and create your binaries. This will decrease your build times and make your engineering team very happy.
5. Your production code is separated from your testing code
If your code is modular, you can easily separate your production code from your testing code. This makes it easier to work on your code, especially when there are many engineers working on the same code base. With non-modular code, it’s much easier to mix testing code with production code, which can lead to problems. With modular code, you can use the same modules for production and testing but put them in separate files, which makes it easier to keep testing code out of production.
This also makes it easier to change your production code as well. If you want to make changes to your production code, all you have to do is make the changes in one file. With non-modular code, you have to search through the entire code base to find all instances of the code you want to change.
6. You’ll know exactly what each module does
Modular programming is all about focusing on single responsibility modules that do one specific thing. If you’re developing a new software product, this will make it easier for you to understand what each module does and how they interact with each other. This will make it easier for you to debug and troubleshoot your code. It’ll also make it easier for other engineers to understand your code. When other engineers are reviewing your code, it’s helpful for them to see exactly what each module does since everything is so well-organized.
I hope you found value in my post about modular programming and that you now understand better why it is not just a design pattern to keep your code clean, but also a very useful practice. If you have never worked on a modular project, I hope you have discovered that this can be a very rewarding trait in larger-scale projects.
Recommended Reading: Benefits of Learning Programming