func loadCached()

in database/DatabaseReference/swift/ViewController.swift [46:104]
34 lines of code
4 McCabe index (conditional complexity)

  func loadCached() {
    // [START load_cached]
    let scoresRef = Database.database().reference(withPath: "scores")
    scoresRef.queryOrderedByValue().queryLimited(toLast: 4).observe(.childAdded) { snapshot in
      print("The \(snapshot.key) dinosaur's score is \(snapshot.value ?? "null")")
    }
    // [END load_cached]

    // [START load_more_cached]
    scoresRef.queryOrderedByValue().queryLimited(toLast: 2).observe(.childAdded) { snapshot in
      print("The \(snapshot.key) dinosaur's score is \(snapshot.value ?? "null")")
    }
    // [END load_more_cached]

    // [START disconnected]
    let presenceRef = Database.database().reference(withPath: "disconnectmessage");
    // Write a string when this client loses connection
    presenceRef.onDisconnectSetValue("I disconnected!")
    // [END disconnected]

    // [START remove_disconnect]
    presenceRef.onDisconnectRemoveValue { error, reference in
      if let error = error {
        print("Could not establish onDisconnect event: \(error)")
      }
    }
    // [END remove_disconnect]

    // [START cancel_disconnect]
    presenceRef.onDisconnectSetValue("I disconnected")
    // some time later when we change our minds
    presenceRef.cancelDisconnectOperations()
    // [END cancel_disconnect]

    // [START test_connection]
    let connectedRef = Database.database().reference(withPath: ".info/connected")
    connectedRef.observe(.value, with: { snapshot in
      if snapshot.value as? Bool ?? false {
        print("Connected")
      } else {
        print("Not connected")
      }
    })
    // [END test_connection]

    // [START last_online]
    let userLastOnlineRef = Database.database().reference(withPath: "users/morgan/lastOnline")
    userLastOnlineRef.onDisconnectSetValue(ServerValue.timestamp())
    // [END last_online]

    // [START clock_skew]
    let offsetRef = Database.database().reference(withPath: ".info/serverTimeOffset")
    offsetRef.observe(.value, with: { snapshot in
      if let offset = snapshot.value as? TimeInterval {
        print("Estimated server time in milliseconds: \(Date().timeIntervalSince1970 * 1000 + offset)")
      }
    })
    // [END clock_skew]
  }