AI BriefingThe Truth or Myth of SOLID Every Developer Should Know
Key point
This piece corrects the history and misunderstandings surrounding the SOLID principles, a cornerstone of software design, and presents the right way to apply them.
Details
The SOLID five principles, which form the foundation of software design, were established by Robert C. Martin and have stood as a solid set of design principles for over 20 years. Adhering to these principles enables a flexible structure with low coupling and high cohesion, improving code readability and making maintenance easier.
In particular, the Single Responsibility Principle (SRP) is a part that many developers misunderstand. Instead of the subjective definition that simply says 'a class should have only one responsibility,' it should be approached with the objective criterion that 'a module should have only one reason to change.'
For example, if a bank's lending (loan) interest rate calculation code and deposit interest rate calculation code are mixed together in a single class, a change on one side risks affecting the other. Modules with different reasons for change like this must be designed separately to prevent unexpected side effects.
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