What are DDD, SOLID and dependency inversion?
Understand the concept
Domain-driven design models software around business concepts and their boundaries. SOLID is a group of design principles for keeping responsibilities focused and dependencies manageable. Dependency inversion is one of those principles: high-level business policy depends on an abstraction rather than a particular low-level implementation.
Important ideas
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DDD models business concepts and clear domain boundaries.
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SOLID: one responsibility, extend safely, replace subtypes safely, keep interfaces focused, depend on abstractions.
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Dependency inversion lets business logic use a contract instead of a specific database or vendor class.
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Use business names such as AllocationPolicy when they clarify behavior, but avoid introducing abstractions with no expected variation or testing benefit.
Can you explain it without the notes?
What are DDD, SOLID and dependency inversion?
Use your own words. Explain an example and one limitation before checking the explanation.
Check your explanation
Domain-driven design models software around business concepts and their boundaries. SOLID is a group of design principles for keeping responsibilities focused and dependencies manageable. Dependency inversion is one of those principles: high-level business policy depends on an abstraction rather than a particular low-level implementation.
Turn this concept into a clear answer.
- Explain a real dependency you separated and how that made a change safer, instead of only reciting acronyms.
Adapted from 07_SYSTEM_DESIGN_ARCHITECTURE.md · “What are DDD, SOLID and dependency inversion?”. Examples are study fragments; framework behavior can depend on your version.