ludic/docs/language/structure/kw-property.md
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-29 17:53:22 +03:00

1.4 KiB


id: kw-property name: property category: structure kind: keyword tokens: property sig: property Name { field: T = default, … } tip: A named record of typed fields — a per-model component, or a plain heap record. order: 1

A property declares a named record of typed fields, each with a default value. It is the one record keyword in Ludic, and how you use it decides how it is stored: list it in a model (or attach it with spawn) and it becomes a per-instance component held in the engine's storage and bound in queries; construct it with new and it becomes a plain heap record addressed by a pointer. Fields carry a type and a default, so a freshly spawned or new-ed property starts fully seeded. Give fields descriptive names — column/row, not x/y — because those names are what handlers read and write.

program Descent {
  property Position { column: int = 0, row: int = 0 }
  property Health   { current: int = 100, maximum: int = 100 }
  model Player { Position, Health }

  handler Spawn phase Start {
    spawn Hero { Position { column: 4, row: 4 }; Health { current: 80 } }
  }

  handler DrawWorld phase Render {
    Screen.clear(Color.MidnightBlue)
    for (position, health) in query [Position, Health, {Player}] {
      let bar_width = health.current / 4
      Screen.fill_rectangle(x: position.column, y: position.row, width: bar_width, height: 4, color: Color.Crimson)
    }
    Screen.show()
  }
}