method
Query.first
Query.first(prop) -> int
Returns the first (lowest entity id) live entity that carries prop, or -1 if none do. Handy for a singleton-ish lookup — the player, the current boss, the one active portal — and to test existence (Query.first(prop) >= 0). Read its fields with World.get.
Parameters
propa property id (from World.prop_id("Name"))Example
program Demo {
property Player { hp: int = 0 }
model Hero { Player }
entry {
spawn Hero { Player { hp: 100 } }
let P = World.prop_id("Player")
let hp = World.field_id(P, "hp")
let e = Query.first(P)
if e >= 0 { print(World.get(e, P, hp)) } # 100
}
}