BrunoCerberus

import Combine
import Foundation

/*
+----------------+       +------------------------+       +-------------------+
| View           | ----> | ViewModel              | ----> | Interactor        |
|                |       |                        |       |                   |
|    ViewEvents  | <---- |  ViewState   DomainMap | <---- |   DomainState     |
+----------------+       +------------------------+       +-------------------+
                            ^         |

BrunoCerberus

import Combine
import Foundation

// As any Publisher
func fetchMovies() -> AnyPublisher<MovieResponse, Error> {
    let url = URL(string: "https://api.themoviedb.org/3/movie/upcoming?api_key=123")!
    
    return URLSession
        .shared
        .dataTaskPublisher(for: url)

BrunoCerberus

import Foundation

/// A property wrapper that provides type-safe access to user defaults.
@propertyWrapper
struct UserDefault<Value> {
    // MARK: Properties
    
    /// The wrapped value representing the user default.
    var wrappedValue: Value {
        get {

BrunoCerberus

import SwiftUI

/// 1. Create the environment key to hold the custom caption background color.
private struct CaptionColorKey: EnvironmentKey {
    static let defaultValue = Color(.secondarySystemBackground)
}

/// 2. Extend the environment to provide access to the custom caption background color.
extension EnvironmentValues {
    var captionBackgroundColor: Color {

BrunoCerberus

/*
 MARK: GENERICS
 enables you to write flexible, reusable functions and types that can work with any type
*/

// MARK: Generic Functions
// MARK: T is a Type Parameter (T, U, V)

// MARK: solution without Generics
// with inout you can change a parameter value, becase by default they are constants

BrunoCerberus

import Combine
import SwiftUI

class CustomSubscriber: Subscriber {
    typealias Input = Int
    typealias Failure = Never
    
    func receive(subscription: Subscription) {
        subscription.request(.unlimited) // Request unlimited values.
    }

BrunoCerberus

import Foundation
import Combine

// Helper function to print the description of the example before running it.
public func example(of description: String, action: () -> Void) {
    print("\n——— Example of:", description, "———")
    action()
}

// Simple struct to represent a coordinate with x and y values.

BrunoCerberus

import Foundation

// Define the distance in kilometers
let distanceInKilometers = 1.2

// Print the distance in kilometers
print("Distance is", distanceInKilometers, "km")

// Create a Measurement instance with the distance value and unit in kilometers
let measurement = Measurement(

BrunoCerberus

import Foundation

// Basically opaque return types you delegate the
// inferring type to the compilator instead of defining
// explicitly its type.

// with some
func getData() -> some Collection {
    return [1, 2, 3, 4, 5]
}

BrunoCerberus

class Person {
    let name: String
    var pet: Pet?

    init(name: String) {
        self.name = name
        print("\(name) is being initialized.")
    }

    deinit {