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Static Properties and Methods

Static members belong to a class rather than a particular object instance. Static mutable state can leak between calls and make tests order-dependent; prefer injected services for shared de…

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Using Abstract Base Classes

Abstract classes offer shared behavior and enforce subclass method contracts. An abstract base class cannot be instantiated, and overusing inheritance couples otherwise independent behavior.

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Using Enums to Model States

Enums represent a closed set of valid states instead of unvalidated strings. Backed enums provide from/tryFrom for external scalar data, but adding a new case still requires consumers to ha…

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