Dependency Inversion Principle
Version 1.0.0 · Updated 2026-07-30
CORE DEFINITION
High-level modules should not depend on low-level modules. Both should depend on abstractions. Abstractions should not depend on details. Details should depend on abstractions.
SCAFFOLDING EFFECT
Reduce cognitive load
Decouple core logic. The CEO (high-level) should not depend on a specific secretary (low-level), but on the 'secretary job responsibilities' (abstraction). This way, even if the secretary changes, the CEO's workflow is not interrupted.
Anchor fast decisions
The 'D' in SOLID. Both high-level policy modules and low-level implementation modules depend only on abstract interfaces, not on each other's concrete classes. This way, changing the implementation (low-level) does not affect high-level logic. The high-level defines the interface, and the low-level adapts to it, achieving decoupling and replaceability. The essence is 'programming to interfaces'.
MINIMUM ACTION
In progress 0/5Practice this model in one real situation:
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Source support: Explicit
- en.wikipedia.orghttps://en.wikipedia.org/wiki/Dependency_inversion_principleverified
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