gistfile1.txt

struct Result {
  let text: String
  let someOtherThing: String
}

struct Fetcher {
  static func performQuery(query: String) -> Observable<[Result]> {
    //returns an observable that hits the network, whose dispose action is to cancel the network request
  }
}

class ViewController: UIViewController {
  weak var textField: UITextField!
  
  override func viewDidLoad() {
    let o: Observable<[String]> = 
      textField.rx_text
        .throttle(0.3)
        .distinctUntilChanged()
        .flatMapLatest { query in
            Fetcher.performQuery(query)
          }.map { $0.map { $0.text } 
          }
  }
}