mutating functions

mutating_functions.swift

    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")
    }
    }
    
    mutating func bakePizza() {
        switch self {
        case .preparePizza(id: let id, size: _, type: _, doughType: _):
            self = .bakedPizza(id: id)
        case .addedExtras(id: let id, extras: _):
            self = .bakedPizza(id: id)
        case .bakedPizza(id: let id):
            print("Pizza \(id) is already baked")
        case .deliveredPizza(id: let id):
            print("Pizza \(id) is already delivered")
        }
    }
    
    mutating func deliverPizza() {
        switch self {
        case .preparePizza(id: let id, size: _, type: _, doughType: _):
            print("Pizza \(id) must be baked before delivery")
        case .addedExtras(id: let id, extras: _):
            print("Cannot add extras to Pizza \(id) at this phase")
        case .bakedPizza(id: let id):
            self = .deliveredPizza(id: id)
        case .deliveredPizza(id: let id):
            print("Pizza \(id) is already delivered")
        }
    }