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

1.1 KiB

id name category kind tokens sig tip order
kw-self self ecs keyword self self() The model instance currently bound by the enclosing query loop. 3

self() yields the model instance currently being visited by the innermost enclosing query loop, as an entity handle. It is how a handler names "the instance this pass is about" — most often to despawn self(), to attach/detach a property on self(), or to pass the current instance to a function. Because it depends on the active query iteration, self() is only meaningful inside a for (…) in query […] loop (or a @Queries handler, which desugars to one). Outside any query it has no instance to refer to.

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

  handler Boot phase Start {
    spawn Grunt { Position { column: 1, row: 1 }; Health { current: 0 } }
  }

  handler RemoveDefeated phase LateUpdate {
    for (health) in query [Health, {Enemy}] {
      if health.current <= 0 { despawn self() }
    }
  }
}