What is Modular Programming?


The goal of modern technology is to simplify complex processes. When we look at traditional programming methodologies, we can see that huge software has codes with thousands of lines. Understanding the function of the code segments might be a little challenging because of the classic design. The difficulty of programs was thus overcome by the introduction of modular programming. In the year 1960, engineers started segmenting huge software systems into smaller pieces, which is when modular programming first evolved. While this idea is almost six decades old, a modern software engineer still finds it to be quite beneficial.

You will learn about modular programming, terminology, and ideas that are connected, as well as its benefits and drawbacks, in this article provided by a team of programming experts from AssignmentCore website that do coding assignments for students.

What is Modular Programming?

The technique of breaking a computer program down into smaller, independent modules is known as modular programming. The modules come together to form functional application software. A module is a distinct piece of software. It frequently works with other system components to perform a number of applications and activities. In order to create computer code that may be reused by other applications, similar functions are bundled into one unit while distinct functions are produced as independent units.

Nearly every modern device, including vehicles and smartphones, depends largely on modularization. Computers are among the items that have the highest level of modularization. This means that whatever is a need for the hardware is also a requirement for the computer program. The use of a modular software architecture is required if you want to create programs that are easy to read, trustworthy, and maintain.

Modules & APIs

Interfaces or APIs are a very helpful way for modules to communicate with one another. While using an API, you hide the core of the code and just make available the parts that developers need to utilize the module. This implies that your API might function as something like a contract by outlining the functions of the module or library and the conditions under which external programs may use it.

Using APIs, you can be certain of whether modules’ components ought to or ought not to change without prior notice. In this manner, other objects may continue utilizing the API and have confidence that nothing will change unexpectedly under them, even when you need to alter or fix items in a library that are hidden underneath. Also, it’s much simpler to glance at a module and determine what it can do.

Why Modular Programming is Preferred?

By dividing big software systems into smaller pieces, modular programming aims to make the development and maintenance of such programs easier. It offers the following advantages:

● Code is Easier to Read

Since it is divided into functions that each only handle a single part of the overall functionality, modular programming typically makes your code easier to read. As opposed to monolithic code, it may significantly reduce the size of your files and make them simpler to read.

If you divide anything up into too many little functions or if you move data or functions back and forth between too many files, modular programming can get a bit chaotic. In contrast to a function with hundreds of lines, it works incredibly well if your modules are intelligently divided. You can comprehend a block of code without a remark by using a short function with a clear name.

● Code is Easier to Test

The best software for testing is software that has been divided into separate parts. That’s because tests for tiny functions with limited functionality may be considerably tighter and more thorough than tests for large functions with extensive functionality. This is especially true if you can only test a function’s outputs and not the steps it takes. Furthermore, since tests may serve as illustrations of how the code operates, easier testing can result in less lengthy, detailed comments being required.

● Easily Find Things at Later Stages

To make software more modular, comparable types of functions are grouped into separate libraries and files, and related auxiliary functions are separated into other files. The ability to quickly and easily discover what you’re seeking afterward can be greatly accelerated by this kind of function separation. By establishing rules for file names and locations, you may use modular programming to make finding particular code simpler. It’s far simpler to search for and discover code if you can make an educated estimate as to where a file could be and what the file or function might be called.

● Reusability Without Bloat

In many cases, you’ll need to utilize the same code or function more than once. Because of modularity, you may call a piece of code from any other module or library without having to copy and paste it from another location. Modularity provides us the benefit of reusability so that we can extract our code from anywhere using interfaces or libraries rather than copying and pasting it repeatedly. As a result, there are fewer copies of each piece of code that performs a particular function, which minimizes bloat and size.

● Single Source For Quicker Fixes

It reduces the number of possible places where problems might occur and speeds up fixing when you do encounter bugs by having each module provide a single source of truth for your particular functions. By using slightly distinct implementations of the same feature, two pieces of code that depend on one another are less likely to encounter issues. Also, if there is a defect in the code or a single function has to be updated, you simply need to make the necessary changes in one module, and all applications that depend on it will be immediately updated. Let’s say that any program has an issue that has to be fixed that affects the payment alternatives. Because we are aware that the code for payments will be contained in a separate function and that function will only be corrected, modularity can be very helpful.

● Easier, Lower-Risk Updates

Every library created using modular programming has a set API layer that shields applications using it from changes made to the library itself. There is a considerably smaller chance of accidentally breaking code that depends on whatever you modify if you don’t alter the API. Of course, you still need to exercise caution, but APIs undoubtedly make it apparent when you’re ready to modify a public function. For instance, if you didn’t have specific APIs and someone altered a function, they believed it was only utilized within that particular library; they may unintentionally break anything.

● Easier Refactoring

Refactoring is a technique for reorganizing internal code without altering its external functioning. Refactoring may be simpler using modular programming. If your code is not modular, it feels excessively time-consuming. There are several causes for this, but just to give you one, if you want to script or automate refactoring, both APIs and adhering to a rigid file/folder organization can assist. A long-term refactoring effort is decreased by the modularization of software code.

● Easier to Collaborate

In the team, various developers each work on a specific piece of code. When various software components must be worked on by distinct teams, modular programming is crucial. Git conflicts and other problems are usually triggered when several developers are working on the same piece of code. These problems may be frustrating and slow down the team. You may lessen the likelihood of this occurring if the code is divided up into numerous functions, files, and/or repositories. In order to ensure that teams are accountable for their portion of the product and to provide them the ability to divide the work into smaller assignments, you can also assign ownership to particular code modules. In order to guarantee that everything will work together upon deployment, the teams and modules join together via well-defined interfaces and open APIs.

Advantages & Disadvantages of Modular Programming

Using the modular programming technique has a number of significant benefits, including the following:

  • It requires less writing of code.
  • It is not necessary to repeatedly input the code because a single procedure may be created for reuse.
  • Due to the fact that a small team only handles a tiny portion of the complete code, programs may be built more quickly.
  • Many programmers can work together on the same application thanks to modular programming.
  • The quality of a particular piece of code is also enhanced by modularization in programming. The quality of every individual segment increases when the entire program is divided into smaller portions, and each employee is given accountability for a specific area.
  • The code is brief, clear, and straightforward to comprehend.
  • There are many files where the code is kept.
  • Since they are restricted to a particular subroutine or function, errors are simple to spot.
  • It is simple to regulate the scope of variables.
  • In numerous applications, the same code may be utilized.

Although modular programming has benefits, there are some drawbacks as well, including-

  • Modular programming calls for more resources in terms of both time and money for a given project.
  • Bringing all the components together is a difficult process.
  • To ensure that other program modules are unaffected, careful documentation is necessary.
  • Some modules could partially redo a task that was handled by another module. As a result, modular programs use more memory and longer execution times.
  • Because different individuals working on the design of various modules may not have the same style, integrating diverse modules into a single program may not be a difficult undertaking.
  • Given that each function has a thousand lines of code, testing and debugging take a lot of time, which decreases the program’s performance.

The Future of Modular Programming

Even though the idea of modular programming is not new, it is still widely used. Modular programming is the obvious choice due to the method in which a lot of recent package managers, frameworks, and libraries are built up for dependency management & code sharing. For instance, there are several NPM libraries that specialize in a single task. Moreover, an increasing number of programmers are utilizing frameworks that are limited to doing particular tasks, such as Bulmer, a CSS framework that is rather straightforward when compared to some of the other widely used CSS frameworks. Smaller libraries may not seem as remarkable since they offer less capability, but learning to use them requires less time, and because they are often smaller, there is less code bloat than with bigger libraries.

Particularly in the Javascript environment, it’s critical for developers to understand that software development involves more than just writing code. It involves being able to locate, evaluate, and employ the appropriate building components, as well as creating reliable, maintainable programs. That is why it is so significant; modularity is the foundation of all of that.


Thus, by now, you must be aware of the importance of comprehending the modular programming idea. Modularity is solely used in programming for the human side of development. Computers can run code without it needing to be divided into smaller pieces. It is only due to human cognitive limitations that programming must be created in smaller units. If you adhere to the philosophy of “deconstructing complexity,” you will have come to see the significance of the modular programming idea and how this software design strategy may assist you in developing a better website.

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