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content: six real code exhibits, rendered by the panel (AUD-152)

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Sam Rolfe
2026-10-28 16:00:06 +11:00
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content/history/l3/history-code-exhibits.md
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@@ -8,26 +8,34 @@ confidence: historic
period: "2006–2026"
tech: [ActionScript, JavaScript, PHP, TypeScript, C++, Nix]
metrics: [{label: "code exhibits", value: 6}, {label: "technology eras spanned", value: 5}]
artefacts: []
artefacts: [{type: repo, label: "ActionScript 3 — the Siren class", url: "content/assets/code/01-actionscript-class.as"}]
public: true
last_verified: 2026-10-26
last_verified: 2026-10-28
tags: [history, code, exhibits, artefact]
---
The excerpts are selected from source that exists on disk; each one lands in Phase 7 with two sentences on why it is good code.
**Status: published.** This page shows the ActionScript class and indexes the other five, each of which is exhibited on the page where it belongs.
## The six
| # | Era | Source | What the excerpt shows |
| # | Era | Exhibit | Where it is shown |
|---|---|---|---|
| 1 | Object-oriented ActionScript | the brief-case builder and the national beer campaign | class design, imports, encapsulation |
| 2 | Hand-written JavaScript engine | the text-effects engine from the site builder (about 2 200 lines) | easing and a timeline core |
| 3 | PHP media pipeline | the media encoder from the site builder (about 3 400 lines) | one encode operation and the FFmpeg piping around it |
| 4 | TypeScript | the vehicle-tracking application's schema and typed service layer | types, interfaces, a router |
| 5 | Embedded C++ | the Wi-Fi manager interface and implementation | interface versus implementation in firmware |
| 6 | Declarative infrastructure | the 25-line Nix package definition | pinned version, verified hash, written exit condition |
| 1 | Object-oriented ActionScript | `01-actionscript-class.as` — class, imports, encapsulation | this page |
| 2 | Hand-written JavaScript engine | `02-js-easing-core.js` — easing functions and the timeline loop | [the site builder](../../products/l3/products-websitebuilder.md) |
| 3 | PHP media pipeline | `03-php-encode-op.php` — one GIF encode operation and its FFmpeg commands | [the site builder](../../products/l3/products-websitebuilder.md) |
| 4 | TypeScript | `04-typescript-service-layer.ts` — a typed tRPC boundary | [the estate](../../platform/platform-estate.md) |
| 5 | Embedded C++ | `05-embedded-cpp-interface.hpp` — interface split from implementation | [the edge fleet](../../edge/edge-fleet.md) |
| 6 | Declarative infrastructure | `06-nix-derivation.nix` — pinned version, verified hash, exit condition | [the Nix package](../../platform/l3/platform-tuios-package.md) |
Total is roughly 225 lines across twenty years, which is the point: each excerpt is chosen to show judgement rather than volume.
Total is 243 lines across twenty years, which is the point: each excerpt is chosen to show judgement rather than volume.
## Why this exhibit is good code
Every field is private and explicitly typed, and the public surface is two methods, so a caller cannot push the object into a state it does not understand. The constructor takes what it needs as parameters instead of reaching for it, which is why the same class can drive every siren on the screen without knowing where any of them are.
## Limits stated on the page
The excerpt is verbatim, including a latent typo (`this.high` rather than `this.height`). It is left as found: the excerpt is evidence, not a portfolio piece.
## What it proves
@@ -35,4 +43,4 @@ That the stack changed six times and the discipline did not. Exhibit 6 is the le
## When it is delivered
Phase 7. Source paths are recorded in the planning notes; nothing is published from a path that has not been read at capture time.
Published. The six files are in this repository under `content/assets/code/`; the archive path is withheld. The other five are linked above from the pages that carry their claims.