Sajjon

/// Returns a binary predicate using the given key path to create an ascending order
/// for elements of type `Root`.
func ascending<Root, Value: Comparable>(_ path: KeyPath<Root, Value>) -> (Root, Root) -> Bool {
  return { $0[keyPath: path] < $1[keyPath: path] }
}

/// Returns a binary predicate using the given key path to create a descending order
/// for elements of type `Root`.
func descending<Root, Value: Comparable>(_ path: KeyPath<Root, Value>) -> (Root, Root) -> Bool {
  return { $0[keyPath: path] > $1[keyPath: path] }

Sajjon

import UIKit
import Foundation

// Written in Swift 4.2, Xcode 10 beta 6
// Valid Identifier Heads found at: https://docs.swift.org/swift-book/ReferenceManual/LexicalStructure.html
// Code inspired by Nate Cooks gist: https://gist.github.com/natecook1000/c5fb2b8cd0967f53770e


extension UnicodeScalar : Strideable {

Sajjon

typealias NoArgMethod<StrongObject, ReturnType> = (StrongObject) -> () -> ReturnType
typealias SingleArgumentMethod<Argument, StrongObject> = (StrongObject) -> (Argument) -> Void

func unown<O, R>(
    _ object: O, // This is strong
    _ method: @escaping NoArgMethod<O, R>
    ) -> () -> R where O: AnyObject, R: Any
{
    return { [unowned object] in

Sajjon

struct AnyNavigator<Destination_>: Navigator {
   typealias Destination = Destination_
   private let _navigateTo: (Destination_) -> Void
   private let _start: () -> Void

   init<Concrete>(_ concrete: Concrete) where Concrete: Navigator, Concrete.Destination == Destination_ {
       _navigateTo = concrete.navigate
       _start = concrete.start
   }

Sajjon

protocol ViewModelType {
    associatedtype Input
    associatedtype Output
    func transform(input: Input) -> Output
}

Sajjon

/* This ⬇ single line ⬇ constitutes a fully working ViewController. Clean code 👌🏽 */
typealias Settings = Scene<SettingsView>

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import UIKit
import RxSwift
import RxCocoa

// MARK: - SettingsView
final class SettingsView: ScrollingStackView {

    private lazy var signOutButton: UIButton = "Sign out"

    // Two `UILabel`s grouped together

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import RxCocoa

protocol EmptyInitializable {
    init()
}

protocol ViewModelled: EmptyInitializable {
    associatedtype ViewModel: ViewModelType
  
    var inputFromView: ViewModel.Input { get }

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import UIKit

import RxSwift
import RxCocoa

final class AuthenticateView: UIView {

    private lazy var signUpButton = UIButton(type: .custom)
    private lazy var signInButton = UIButton(type: .custom)
    private lazy var stackView = UIStackView(arrangedSubviews: [signUpButton, signInButton])

Sajjon

import RxSwift

protocol EmptyInitializable {
    init()
}

protocol ViewModelled: EmptyInitializable {
    
    associatedtype ViewModel: ViewModelType