Query

query is the loop statement for iterating over ECS entities: it filters entities by component type, binds component fields into the loop body as variable views, and reads and writes go straight to host storage. For declaring components see Components.

Forms

Full syntax ([...] marks an optional slot):


query ([ref] name: ComponentType, ...) [with C1, C2] [without C3] [label L] { statements... }


public func UpdateMovement(dt: float) -> void
{
    query (ref pos: Position, vel: Velocity) with Enemy without Dead
    {
        val id = entity;
        pos.X += vel.X * dt;
        pos.Y += vel.Y * dt;
        Runtime.Print("entity", id, "moved to", pos.X, pos.Y);
    }
}

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Last updated on October 11, 2026