As a student learning new things every day, I chose this topic because I was curious as to what it really entails in computer science as it is one of the topics that directly relates to the course. However, little did I know that it was an abbreviation for 5 important design principles employed in software programming to make software designs more understandable, flexible, and maintainable.  I selected this blog because it explains briefly but detailed about each principle of SOLID and definitions.

This blog talks about who introduced the acronym SOLID and its importance. Also, what it stands for, which are Single-Responsibility, Open-Closed, Liskov Substitution, Interface-Segregation and Dependency-Inversion Principles. Not only does it explain each principle, but explanations are concise and easy to comprehend. It has some links that provides detailed explanations to some of the principles, giving examples that enables one to grasp the concept fully. It also explains why each concept can help developers to build better software and the importance of cohesion and less coupling in software development.

In this blog not only did I learn about the 5 principles, but also learned that it is a part of object-oriented programming that enables one to write a better code that is robust. I learned in Single-Responsibility Principle that classes should have a unique responsibility and that will help reduce complexities, reduce dependency on other classes, ensure readability all in while leading to a stronger cohesion. I believe that the quote “do one thing and do it well” has come into importance in this principle as that will help me avoid fusing too much responsibility on classes in my future programs to make editing of codes easy.

In Open-Closed Principle, I learned that any class written or coded can be used as it is written. It can be extended but can not be modified. However this principle made me understand more about inheritance and polymorphism in the sense that classes can be open if attributes can be added but closed if it is available for use/extended/implemented by other classes. I always used to be a victim of modifying parent classes if there are any errors in my sub classes which should not be the case. Also, this principle improves readability.

When looking at sample programs using interfaces, I never understood why interfaces could not be segregated into one, rather such programs could have more than one interfaces. Also, one class could implement many interfaces. However, this blog made me understand why this is the case in Interface-Segregation Principle that an interface can be broken down into smaller interfaces that are specific rather than making it large. In addition, classes do not need to implement interfaces they do not use.

I will encourage other students to read this blog as it helps understand more concepts in Object-Oriented Programming to make them better programmers.


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