FreePascal/Lazarus SOLID Patterns

What problem does it solve?

Provides a structured approach to building SOLID-compliant FreePascal/Lazarus applications, reducing coupling and code smells, while promoting testable, maintainable architectures.

Core Features & Use Cases

• Repository pattern interfaces and concrete implementations for data access.
• Service layer with constructor injection to orchestrate business logic.
• Factory pattern for assembling repositories and services.
• Strategy pattern for interchangeable algorithms (e.g., tax calculations).
• Guidance aligned with SOLID, DDD, and clean architecture for scalable Lazarus projects.

Quick Start

Define your domain entity, create repository interfaces, implement the repository and service with constructor injection, and wire them together with the factory.