Cohesion and Coupling

When writing out code systems, it’s important to keep certain concepts in mind to maintain a clean, low error frequency code base. Such concepts I will be going over in today’s blog is cohesion and coupling. These topics are kind of like a good software design philosophy.

Cohesion

Cohesion is the amount of how focused a certain module or function is to a certain task. The higher the cohesion the more focused the function. It is like a measure of how everything fits together. In general a good system design has high cohesion.

Low Cohesion can be like a metaphorical hand class. It has the ability to fold origami, give massages, write code, draw pictures and etc. A High Cohesion example would be like a Med kit class. It has bandages, bandaids and all things related to healing you. The hand class is unfocused with unrelated tasks while the Med Kit class is very focused.

Coupling

Coupling is the amount of how dependent a certain module or function is to another module or task. A higher coupling means there is strong dependence. Higher coupling also means it may be difficult to change and maintain your code due to the fact that changing one function may cause unintended bugs or side effects to other functions. This can cause an entire system reevaluation that can cost time and money.

Overall a good system design has low coupling and high cohesion.

In addition it is also good to keep a system modularized. This is the process of dividing a system into independent modules that can be reused, easily understood and maintained very easily.

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