Tag Archives: design-principles

SOLID principles by example: Dependency inversion

This is the last blog post about the SOLID principles in object-oriented programming and we talk about the Dependency Inversion Principle (DIP).

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The principle states:

A. High-level modules should not depend on low-level modules. Both should depend on abstractions.
B. Abstractions should not depend on details. Details should depend on abstractions.

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SOLID principles by examples: open/closed

This post continues the analisys of the SOLID principles started some blog posts ago. This is the turn for the Open Closed Priciple (OCP).

The definition

An object/entity should be open for extension but closed for modification.

What we are basically talking about is to design our modules, classes and functions in a way that when a new functionality is needed, we should not modify our existing code but rather write new code that will be used by existing code.

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