The final SOLID principle is known as the Dependency Inversion principle. Arguably the most important of the five principles, the Dependency Inversion principle can be thought of as a culmination of the principles preceding it. Systems that abide by the other SOLID principles tend to follow the Dependency Inversion principle as a result.

The principle is often (re)stated as: “Abstractions should not depend upon details. Details should depend upon abstractions.”

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