brownsoo

/// 배열의 모든 조합 구하기 (순열)
/// 순서에 상관하여 같은 요소라도 순서가 다르면 다른 조합으로 처리 
/// - Parameters:
///   - arr: 제공되는 배열
///   - select: 몇개의 요소를 선택해서 조합할지 결정
/// - Returns: 제공된 배열에서 select 개를 선택해서 조합된 새 배열
func getAllPermutations(_ arr: [Int], select: Int) -> [[Int]] {
    var results: [[Int]] = []
    if select == 1 {
        return arr.map { [$0] }

brownsoo

extension NullIterable<E> on Iterable<E> {
  E? getFirstOrNull(bool test(E element)) {
    try {
      return this.firstWhere(test);
    } catch (e) {
      return null;
    }
  }
}

brownsoo

/// [Page] 배열에서 movies 값만 모아 가져오기.
extension Array where Element == Page {
  var movies: [String] { 
    flatMap { $0.movies }
  }
}

/// Page 샘플
struct Page {
  let movies: [String]

brownsoo

// from Node.js 하이 퍼포먼스 

var users = {};

function getUser(id, next) {
  if (users.hasOwnPropoerty(id)) {
    if (users[id].hasOwnProperty("data")) {
      return next(null, users[id].data);
    }
    // 아직 값이 없음 

brownsoo

class Rest {

  static apiBaseUrl = '';

  static getApiHeader({withoutContentType = false} = {}) {
    const header = {};
    header['reqVersion'] = 2;
    // if (authentic) {
    //   header['Authorization'] = this.getAuthToken();
    // }

brownsoo

// extends ajax
$.ajax = (($oldAjax) => {
  var df = $.Deferred();
  // on fail, retry by creating a new Ajax deferred
  function check(self, status) {
    console.log("check " + status + " => " + self.retries);
    const shouldRetry = status != 'success' && status != 'parsererror';
    if (shouldRetry && self.retries > 0) {
      setTimeout(() => {
        console.log("retry " + self.retries);

brownsoo

/// 바인딩
private var observations: [NSKeyValueObservation] = []
private var viewModel = ExpenseViewModel()

// 뷰 바인딩
observations = [
    viewModel.observe(\.price) {
        let price = $0 ?? 0.0
        self.updatePriceText(with: price)
        self.changesPublisher.onNext(1)

brownsoo

class ExpenseViewModel: NSObject {
    @objc dynamic var price = -1.0
    @objc dynamic var title = ""
    @objc dynamic var text: String? = nil
}

brownsoo

extension NSObjectProtocol where Self: NSObject {

    func observe<Value>(_ keyPath: KeyPath<Self, Value>,
                        onChange: @escaping (Value?) -> Void) -> NSKeyValueObservation {
        return observe(keyPath, options: [.initial, .new]) { _, change in
            onChange(change.newValue)
        }
    }

    func bind<Value, Target>(_ sourceKeyPath: KeyPath<Self, Value>,

brownsoo

Scheduler scheduler = Schedulers.newThread();
Scheduler.Worker worker = scheduler.createWorker();
worker.schedule(() -> {
    result += "First_Action";
    worker.unsubscribe();
});
worker.schedule(() -> result += "Second_Action");
Assert.assertTrue(result.equals("First_Action"));