petrosDemetrakopoulos

import Foundation
import XCTest

class Vehicle {
    private var wheels = [Wheel]()
    
    func add(_ wheel : Wheel) {
        wheels.append(wheel)
    }
}

petrosDemetrakopoulos

class testsForVehicle: XCTestCase {
 
    override func setUp() {
        super.setUp()
    }
    
    func testVehicleIsNotRetained() {
        var sut: Vehicle? = Vehicle()
        let wheel1 = Wheel(vehicle: sut!)
        sut!.add(wheel1)

petrosDemetrakopoulos

class Vehicle {
    private var wheels = [Wheel]()
    
    func add(_ wheel : Wheel) {
        wheels.append(wheel)
    }
}

class Wheel {
    private var vehicle : Vehicle

petrosDemetrakopoulos

print("Hello"[::-1])

petrosDemetrakopoulos

struct Pizza {
	let id: Int
	let size: Int
	let type: PizzaType 
	let doughType: DoughType 
	let hasExtraIngredients: Bool
	let extraIngredients: [String: Int] //Where the key is the ingredient and the value is the amount
  	let isBaked: Bool
  	let isDelivered: Bool
}

petrosDemetrakopoulos

enum Pizza {
    case preparePizza(id: Int, size: Int?, type: PizzaType, doughType:  DoughType)
    case addedExtras(id: Int, extras: [String:Int])
    case bakedPizza(id: Int)
    case deliveredPizza(id: Int)
    
    init(id: Int, size: Int?, type: PizzaType, doughType:  DoughType) {
        self = .preparePizza(id: id, size: size, type: type, doughType: doughType)
    } 
}

petrosDemetrakopoulos

 var isDelivered: Bool {
        switch self {
        case .preparePizza(id: _, size: _, type: _, doughType: _):
            return false
        case .addedExtras(id: _, extras: _):
            return false
        case .bakedPizza(id: _):
            return false
        case .deliveredPizza(id: _):
            return true

petrosDemetrakopoulos

    mutating func addExtras(id: Int, extras: [String:Int]) {
        switch self {
        case .preparePizza(id: let id, size: _, type: _, doughType: _):
            self = .addedExtras(id: id, extras: extras)
        case .addedExtras(id: let id, extras: _):
            self = .addedExtras(id: id, extras: extras)
        case .bakedPizza(id: let id):
            print("Cannot add extras to Piza \(id) at this phase")
        case .deliveredPizza(id: _):
            print("Pizza \(id) must be baked before delivery")

petrosDemetrakopoulos

var napolitana = Pizza(id: 0, size: 8, type: .napolitana, doughType: .thin)
print(napolitana.currentState)
napolitana.bakePizza()
print(napolitana.currentState)
napolitana.deliverPizza()
print(napolitana.currentState)

petrosDemetrakopoulos

var csrf = require('csurf');
var app = express();
app.use(csrf());

app.use(function(req, res, next) {
  res.locals._csrf = req.csrfToken();
  next();
});