SOLID Principles
Version 1.0.0 · Updated 2026-07-30
CORE DEFINITION
Five golden rules for building robust systems. - SRP: Single Responsibility (a module should do only one thing). - OCP: Open/Closed Principle (open for extension, closed for modification). - LSP: Liskov Substitution (subtypes can replace their base types). - ISP: Interface Segregation (do not depend on interfaces you do not use). - DIP: Dependency Inversion (depend on abstractions, not concretions).
SCAFFOLDING EFFECT
Reduce cognitive load
- System aesthetics: not only in coding, but also in designing department structures, SOLID should be followed. For example, SRP: if a department's responsibilities are not single, it will inevitably lead to buck-passing and inefficiency.
Anchor fast decisions
The five design principles together reduce coupling, increase cohesion and extensibility: SRP ensures changes only affect one place, OCP handles change through extension rather than modification, LSP guarantees safe inheritance semantics, ISP reduces interface pollution, and DIP makes high-level modules not depend on low-level details. They constrain design from five angles: responsibility, extension, substitution, interface, and dependency, making the system easier to modify, test, and evolve.
MINIMUM ACTION
In progress 0/1Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/SOLIDverified
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