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Hexagonal architecture patterns with pure core and side-effect shell for functional codebases
Passed 7 of 22 test cases with the skill, and 15 of 22 without it.
0 fixed17 passed either way3 still failing2 broke
Tokens, turns and time describe resource use, not a dollar price.
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Ports and adapters in functional programming. Structure applications with a pure core and side-effect shell.
Cross-references: fp-principles | fp-domain-modeling | fp-usable-design
[STARTER]
Functional architecture naturally implements ports and adapters. The paradigm's separation of pure functions from side effects IS the hexagonal boundary.
| OOP Concept | FP Equivalent | Why |
|---|---|---|
| Port (interface) | Function type signature / type alias | Port defines contract; function signature IS that contract |
| Adapter (class) | Concrete function implementation | Adapter fulfills contract; matching function does same |
| DI container | Function parameters / partial application | Dependencies passed as arguments, no container needed |
| Domain service class | Module of pure functions | Related pure functions replace stateful service object |
| Entity with behavior | Immutable data + functions operating on it | Data and behavior separated; functions transform immutable values |
[STARTER]
All business logic is pure; all side effects live at the system's edges.
The Sandwich Pattern: Read (impure) -> Decide (pure) -> Write (impure)
+--------------------------------------------------+
| Side-Effect Shell (thin) |
| - HTTP handlers, CLI, message consumers |
| - Database access, file I/O, network calls |
| - Reads data, calls core, writes results |
| |
| +--------------------------------------------+ |
test cases passed, vs 15 / 22 without
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