Add Null Object and Singleton patterns, enhance Specification#475
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abdalwahab-daw wants to merge 4 commits into
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Add Null Object and Singleton patterns, enhance Specification#475abdalwahab-daw wants to merge 4 commits into
abdalwahab-daw wants to merge 4 commits into
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- Add Null Object behavioral pattern with Customer/NullCustomer example - Add Singleton creational pattern with AppConfig example - Enhance Specification with real-world e-commerce product filtering example, full docstrings, and additional doctests
- 34 tests covering all three contributed patterns - 100% code coverage on all three pattern modules - Tests include edge cases, composite specifications, and singleton isolation
- Reusable templates: Observer, Singleton, Null Object, Specification - Real-world examples: Library System, Exam Platform, Inventory Management - All examples include passing doctests
- Maps each pattern to real-world systems (Library, E-Commerce, ERP, Exam Platform) - Includes when to use / when NOT to use guidance - SOLID principles analysis for each pattern - Pattern selection decision tree and cross-pattern integration example
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Summary
This PR adds two new design patterns and enhances an existing one:
New Patterns
Enhanced Patterns
All 35 doctests pass successfully.