let garageIDwithFavVehicles = Vehicle.vehicles .filter( {favVehicleList.contains($0.model) } ) .map { $0.garageID } let garageOwners = Garage.localGarages .filter( {garageIDwithFavVehicles.contains($0.id) } ) .map { $0.garageOwner } // ["Cary's Garage", "Amy's Master Shop"]