ludic/docs/language/control/kw-in.md
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docs(api): per-symbol pages, fuzzy search, deep token linking, hover cards
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Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
2026-08-29 17:53:22 +03:00

1.2 KiB

id name category kind tokens sig tip order
kw-in in control keyword in for x in range | query The part of a for loop that names what to iterate — a range or a query. 3

The in keyword is the bridge in a for loop between the loop's bindings and the source it walks. On the right of in you write either a numeric range, a .. b, binding one fresh index each pass, or an ECS query [...], binding one variable per non-tag property for each matching model instance. It always pairs with for and never stands alone. In the query form the parentheses group the bound properties — for (position, velocity) in query [Position, Velocity] — and the body then runs once per instance that carries them all.

program Movement {
  property Position { column: int = 0, row: int = 0 }
  property Velocity { delta_x: int = 0, delta_y: int = 0 }
  model Enemy { Position, Velocity }

  handler Boot phase Start {
    for slot in 0 .. 3 {
      spawn Grunt { Position { column: slot * 4, row: 2 }; Velocity { delta_x: 1 } }
    }
  }

  handler AdvancePositions phase Update {
    for (position, velocity) in query [Position, Velocity, {Enemy}] {
      position.column = position.column + velocity.delta_x
    }
  }
}