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    SOLID Principles: The Foundation of Maintainable Code

    July 6, 2025
    1 min read
    By Saanj Vij

    ###Solid Principles

    PrincipleDescription
    Single ResponsibilityA class should have only one reason to change. (Multiple small interfaces mean fewer if statements, lower coupling, and higher cohesion.)
    Open/Closed PrincipleA class should be open for extension but closed for modification. (Use new classes for new behavior, parameters, extension methods, inheritance, dependency injection.)
    Liskov SubstitutionObjects of a superclass should be replaceable with objects of a subclass without affecting the correctness of the program. (Tell objects to perform a task instead of asking objects by using if outside the object.)
    Interface SegregationClients should not be forced to depend on interfaces they do not use. (Use smaller cohesive interfaces instead of large fat interfaces.)
    Dependency InversionHigh-level modules should not depend on low-level modules; both should depend on abstractions.

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