firstWhere method

(Entity, A)? firstWhere(
  1. Query1UntilCallback<A> predicate
)

Implementation

(Entity, A)? firstWhere(Query1UntilCallback<A> predicate) {
  final driver = Query.chooseDriver(_driverCandidates);
  final driverIsA = identical(driver, _a);
  _world.beginQuery(this);
  try {
    for (var i = 0; i < driver.length; i++) {
      final entityIndex = driver.entityIndexAt(i);
      final aDense = driverIsA ? i : _a.denseIndexOf(entityIndex);
      if (aDense < 0) continue;
      if (!Query.passesFilters(entityIndex, _withStores, _withoutStores)) {
        continue;
      }
      final entity = _world.entities.resolve(entityIndex);
      final a = _a.valueAt(aDense);
      if (predicate(entity, a)) return (entity, a);
    }
    return null;
  } finally {
    _world.endQuery();
  }
}