December 2016
Intermediate to advanced
560 pages
13h 4m
English
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Dependency Inversion principle
The last of the SOLID principles is based on two statements, that Wikipedia states in this form:
- High-level modules should not depend on low-level modules. Both should depend on abstractions.
- Abstractions should not depend upon details. Details should depend upon abstractions.
As for the first statement, we should clarify what we understand by high-level and low-level modules. The terminology is related to the importance of the actions performed by the module.
Let's put it simply: if a module holds the business logic of a Customers class, and another includes the format that a list of the Customers class uses in a report, the first one would be high-class and the second would be low-class.
The second statement speaks ...
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