ludic/docs/language/scenes/kw-enter.md
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docs(api): per-symbol pages, fuzzy search, deep token linking, hover cards
Rebuild the API Reference around one page per symbol and richer, verified content.

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  instead of a single scrolling page; namespace overview pages (ns-screen …
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Tooling
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-29 17:53:22 +03:00

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Markdown

---
id: kw-enter
name: enter
category: scenes
kind: keyword
tokens: enter
sig: on enter { … }
tip: The scene-entry hook — runs once as a scene becomes active.
order: 3
---
`enter` names the body of a scene's entry hook, written `on enter { … }`. It runs <b>once</b> each time the scene becomes active — at boot for the `start` scene (right after the `Start` phase), and on every `become Name` that switches into it. This is where a scene builds what it owns: spawn its models, reset its counters, set the tilemap, open a menu. It is a lifecycle hook, not a phase, so it may not contain `phase` handlers; the scene's ongoing behaviour goes in its `layer` handlers instead.
```ludic
program EnterHookExample {
property Position { column: int = 0, row: int = 0 }
model Player { Position }
var score: int = 0
scene Overworld start {
on enter {
score = 0
spawn Player { Position { column: 5, row: 5 } }
}
layer World {
handler DrawWorld phase Render {
Screen.clear(Color.MidnightBlue)
for (current_position) in query [Position, {Player}] {
Screen.fill_rectangle(x: current_position.column * 16, y: current_position.row * 16, width: 16, height: 16, color: Color.LimeGreen)
}
Screen.show()
}
}
}
}
```