kien-hoang

/*
Observer Pattern
1. The subscriber is the "observer" object and receives updates.
2. The publisher is the "observable" object and sends updates.
3. The value is the underlying object that's changed.

Reference: https://howtodoinjava.com/design-patterns/behavioral/observer-design-pattern/
*/

import Foundation

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/*
Observer Pattern
1. The subscriber is the "observer" object and receives updates. `AppCoordinator`
2. The publisher is the "observable" object and sends updates. `LoginViewController`
3. The value is the underlying object that's changed.
*/
import UIKit

final class AppCoordinator {
    init() {

kien-hoang

/*
Memento Pattern
1. The `originator` is the object to be saved or restored.
2. The `memento` represents a stored state.
3. The `caretaker` requests a save from the originator and receives a memento in response. 
The caretaker is responsible for persisting the memento and, later on, 
providing the memento back to the originator to restore the originator’s state.
*/

protocol Originator {

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/*
DispatchGroup 
Create a group, register a bunch of `enter` events, `leave` when a task completes 
and the group will automatically do code in `notify` block when all work is done
*/

import UIKit

// Example for calling API
func callAPI(delay: Int, completion: @escaping () -> Void) {

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final class URLRequestBuilder {
    private var components = URLComponents()
    private var httpMethod: String = "GET"
    private var headers: [String: String] = [:]
    private var body: [String: Any]?

    // MARK: - Lifecycle
    
    init(baseUrl: String = "https://api.themoviedb.org") {
        components = URLComponents(string: baseUrl)!

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protocol Strategy {
    func execute(a: Int, b: Int)
}

class ConcreteStrategyAdd: Strategy {
    func execute(a: Int, b: Int) {
        print("a + b = \(a + b)")
    }
}