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77 lines
3.3 KiB
Markdown
77 lines
3.3 KiB
Markdown
# MIL-004 First-class functions and decorators
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## Metadata
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| Key | Value |
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| --- | --- |
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| ID | MIL-004 |
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| CrossReference | [BC-001], [ADR-0001] |
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| Language | en |
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| Domain | it |
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## Version History
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| Date | Status | Author | Reviewer | Change | Commit |
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| --- | --- | --- | --- | --- | --- |
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| 2026-11-06 | Deprecated | Jens Tirsvad Nielsen | S01 | Initial version | [73a5a95] |
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| 2026-11-06 | Accepted | Jens Tirsvad Nielsen | S01 | Paths follow the layered layout of ADR-0001 | [0f4e36b] |
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---
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## Purpose
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Decide whether lectures 5 and 6 (functions as first-class objects, nested and returned functions, decorators) are implemented, tested and illustrated.
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## Deliverable
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`src/flask_day_54/domain/first_class_functions.py` (`add`, `subtract`, `calculate`, nested and returned functions) and `src/flask_day_54/domain/decorators.py` (the @ syntax) with tests, and screenshots for lectures 5 and 6.
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## Go / No-Go Criteria
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| # | Criterion (objectively checkable) | Go | No-Go |
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| --- | --- | --- | --- |
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| 1 | `calculate(add, 2, 3)` returns 5 and `calculate(subtract, 5, 3)` returns 2 (tested) | Met | Not met |
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| 2 | A nested function is returned and called independently of its parent (tested) | Met | Not met |
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| 3 | A decorator applied with the @ syntax wraps the home greeting without changing the wrapped function's name (tested) | Met | Not met |
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| 4 | Screenshots `lecture-05.png` and `lecture-06.png` exist in `docs/images/` and are shown in the README | Met | Not met |
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## Dependencies
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| Depends on | Reason |
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| --- | --- |
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| MIL-003 | Builds on the finished application and test setup |
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## Traceability
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| Business Case objective / KPI / user story | Reference |
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| --- | --- |
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| Objectives 1 and 3 | BC-001 |
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| CN-002, CN-003 | SA-001 |
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## Ownership
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| Role | Stakeholder ID (SA) |
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| --- | --- |
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| Owner | S01 |
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| Approving reviewer | S01 |
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## Target Date
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2026-11-09 - within the Business Case constraints.
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## Tasks
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| # | Task | Summary | Needs its own Use Case/User Story? | Reference |
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| --- | --- | --- | --- | --- |
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| 1 | Implement first_class_functions | Create `add`, `subtract` and `calculate` that takes a function as argument, plus an outer function with a nested function and one that returns it, exactly as lecture 5 describes. | No | |
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| 2 | Implement decorators | Create a decorator with the @ syntax that adds behaviour before and after a function, using functools.wraps, as lecture 6 recaps. | No | |
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| 3 | Test both modules | Add pytest tests for the lecture examples, including that nested functions are not reachable from outside the parent. | No | |
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| 4 | Screenshot lecture 5: functions as arguments | Capture the real output of running the module (calculate, nested and returned functions) in a rendered terminal transcript. | No | |
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| 5 | Screenshot lecture 6: decorators | Capture the real output of the decorator demo. | No | |
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| 6 | README section for lectures 5 and 6 | Add the two screenshots and a short explanation with the function names. | No | |
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---
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[BC-001]: ../business-case.md
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[ADR-0001]: ../adr/adr-0001-layered-package-layout.md
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[73a5a95]: https://git.tirsystem.com/Tirsvad-Udemy-100-days-of-code/054-flask/commit/73a5a95d28db041e4f27342cc552e18f7d386410
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[0f4e36b]: https://git.tirsystem.com/Tirsvad-Udemy-100-days-of-code/054-flask/commit/0f4e36b68282be23a71aa6684af01ca85a1e9473
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