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Open/Closed and the Single Responsibility Principle

Blog post from Rescale

Post Details
Company
Date Published
Author
Adam McKenzie
Word Count
879
Company Posts That Month
4
Language
English
Hacker News Points
-
Post removed?
No
Summary

The SOLID principles, particularly the Open/Closed principle, provide guidelines for writing adaptable code but can be challenging to grasp, especially regarding the concept of being open for extension yet closed for modification. The principle advocates for writing code that allows behavior to be changed by extending the system through new code rather than modifying existing code, which requires a focus on single responsibility and dependency injection. An example from Rescale illustrates how refactoring an API client to focus on a single responsibility and allowing extensions via request objects simplified code maintenance and adaptability. This approach contrasts with a codebase that neglects Open/Closed, where modifications lead to convoluted, hard-to-maintain code, thereby escalating development costs. By adhering to the Open/Closed principle, developers can create more flexible and scalable systems, reducing the complexity and cost of future changes.

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