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// The MIT License (MIT)
//
// Copyright (c) 2016-2019 Alexander Grebenyuk (github.com/kean).
import Foundation

/// Future extenions.
public struct FutureExtension<Base> {
    /// Base object to extend.
    public let base: Base

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// Configuration settings file format documentation can be found at:
// https://help.apple.com/xcode/#/dev745c5c974

SUPPORTED_PLATFORMS = iphoneos macosx appletvos watchos iphonesimulator appletvsimulator watchsimulator

SWIFT_VERSION = 4.2

IPHONEOS_DEPLOYMENT_TARGET = 9.0
MACOSX_DEPLOYMENT_TARGET = 10.11

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class AsyncAwaitTests: XCTestCase {

    func testAsyncAwait() {
        XCTAssertEqual(fakeAsyncAwait().wait().value, 3)
    }
}

func fakeAsyncAwait() -> Future<Int, Error> {
    return Future.async {
        // Add delay to demonstrate that `await` for `Future<_, Never>` don't

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// MARK: - CancellationTokenSource

/// Manages cancellation tokens and signals them when cancellation is requested.
///
/// All `CancellationTokenSource` methods are thread safe.
final class CancellationTokenSource {
    /// Returns `true` if cancellation has been requested.
    var isCancelling: Bool {
        _lock.lock(); defer { _lock.unlock() }
        return _observers == nil

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public typealias Stack = UIStackView

public extension Stack {
    @nonobjc public convenience init(_ views: UIView..., with: (UIStackView) -> Void = { _ in }) {
        self.init(arrangedSubviews: views)
        with(self)
    }

    @nonobjc public convenience init(_ views: [UIView], axis: UILayoutConstraintAxis = .horizontal, spacing: CGFloat = 0, alignment: UIStackViewAlignment = .fill, distribution: UIStackViewDistribution = .fill) {
        self.init(arrangedSubviews: views)

kean

// The MIT License (MIT)
//
// Copyright (c) 2017 Alexander Grebenyuk (github.com/kean).

import Foundation
import RxSwift
import RxCocoa


extension ObservableType {

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// The MIT License (MIT)
//
// Copyright (c) 2017 Alexander Grebenyuk (github.com/kean).

import Foundation

/// Manages cancellation tokens and signals them when cancellation is requested.
///
/// All `CancellationTokenSource` methods are thread safe.
public final class CancellationTokenSource {

kean

// The MIT License (MIT)
//
// Copyright (c) 2017 Alexander Grebenyuk (github.com/kean).

import Foundation
import Alamofire
import RxSwift
import RxCocoa

// This post is **archived**. For a modern version that uses Async/Await and Actors, see the new article

kean

Problem 4.9. BST Sequences: A binary search tree was created by traversing through an array from left to right and inserting each element. Given a binary search tree with distinct elements, print all possible arrays that could have led to this tree.

Solution.

Let's start with an example.

    4
   / \
  2   5 

kean

// The MIT License (MIT)
//
// Copyright (c) 2017 Alexander Grebenyuk (github.com/kean).

import Foundation

/// Proof-of-concept List implementation, not optimized in any way.
///
/// Usage:
///