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import Combine

extension AnyCancellable {
    func add(to cancellables: inout [AnyCancellable]) {
        cancellables.append(self)
    }
}

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final class ViewModel {
    // 1.
    @Published var operation: MathOperation?
    @Published var operationText: String?
    @Published var firstNumberText: String?
    @Published var secondNumberText: String?
    @Published var result: String?
    
    @Published private var firstNumber: Int?
    @Published private var secondNumber: Int?

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final class ViewController: UIViewController {
    // ...

    // MARK: - Helper methods -
    private func calculateResult() {
        guard let firstNumber = Int(firstNumberTextField.text ?? "")
            , let secondNumber = Int(secondNumberTextField.text ?? "")
            , let selectedOperation = self.selectedOperation
        else {
            return

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final class ViewController: UIViewController {
    // ...

    // MARK: - Life Cycle -
    override func viewDidLoad() {
        super.viewDidLoad()
    
        firstNumberTextField.addTarget(self,
            action: #selector(firstNumberTextFieldChanged),
            for: .editingChanged

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final class ViewController: UIViewController
    // MARK: - Views -
    @IBOutlet private weak var firstNumberTextField: UITextField!
    @IBOutlet private weak var secondNumberTextField: UITextField!
    @IBOutlet private weak var operationTextField: UITextField!
    @IBOutlet private weak var resultLabel: UILabel!

    // ...
}

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import UIKit

enum Dependencies {
    struct Name {
        let rawValue: String
        static let `default` = Name(rawValue: "__default__")
    }
    
    final class Container {
        private var dependencies: [(key: Dependencies.Name, value: Any)] = []

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//
//  ContentView.swift
//  FirestoreTest
//
//  Created by MAC on 21/10/2019.
//  Copyright © 2019 MAC. All rights reserved.
//

import SwiftUI
import Combine

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//
//  UnidirectionalCore.swift
//  UnidirectionalCore
//
//  Created by Fernando Ortiz on 05/05/2019.
//  Copyright © 2019 Fernando Ortiz. All rights reserved.
//

import Foundation

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GetAllUsers().execute(
    onSuccess: { (users: [User]) in
        // Do something with the users. They are already typed!
    },
    onError: { (error: Error) in
        // Do something with the error.
    }
)

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public extension RequestType {
    public func execute (
        dispatcher: NetworkDispatcher = URLSessionNetworkDispatcher.instance,
        onSuccess: @escaping (ResponseType) -> Void,
        onError: @escaping (Error) -> Void
    ) {
        dispatcher.dispatch(
            request: self.data,
            onSuccess: { (responseData: Data) in
                do {