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Pema Khando Shachentsang
Courses Plus Student 1,210 PointsVending machine
protocol VendingMachineType { var selection: [VendingSelection] { get} var inventory: [VendingSelection: ItemType] { get } var amountDeposited: Double { get set } init (inventory: [VendingSelection: ItemType]) func vend(selection: VendingSelection, quantity: Double) throws
} protocol ItemType { var price: Double { get} var quantity: Double { get set } }
// Error Types
enum InventoryError: ErrorType { case InvalidResource case ConversionError case InvalidKey }
// Helper Classes
class PlistConverter { class func dictionaryFromFile(resource: String, ofType type: String) throws -> [String : AnyObject] { guard let path = NSBundle.mainBundle().pathForResource(resource, ofType: type) else {
throw InventoryError.InvalidResource
}
guard let dictionary = NSDictionary(contentsOfFile: path),
let castDictionary = dictionary as? [String: AnyObject] else {
throw InventoryError.ConversionError
}
return castDictionary
}
}
class InventoryUnarchiver {
class func vendingInventoryFromDictionary(dictionary: [String : AnyObject]) throws-> [VendingSelection : ItemType] {
var inventory: [VendingSelection : ItemType] = [:]
for (key, value) in dictionary {
if let itemDict = value as? [String : Double],
let price = itemDict["price"], let quantity = itemDict["quantity"] {
let item = VendingItem(price: price, quantity: quantity)
guard let key = VendingSelection( rawValue: key) else { throw InventoryError.InvalidKey
}
inventory.updateValue(item, forKey: key)/ i don't know items is error
}
}
return inventory
}
}
// Concerte Types
enum VendingSelection : String { case Soda case DietSoda case Chips case Cookie case Sandwich case Wrap case CandyBar case PopTart case Water case FruitJuice case SportsDrink case Gum }
struct VendingItem { let price: Double var quantity: Double }
class VendingMachine: VendingMachineType {
let selection: [VendingSelection] = [.Soda,.DietSoda,.Chips,.Cookie
,.Sandwich,.Wrap,.CandyBar,.PopTart,.Water,.FruitJuice,.SportsDrink,.Gum]
var inventory: [VendingSelection: ItemType]
var amountDeposited: Double = 10.0
required init(inventory: [VendingSelection : ItemType]) {
self.inventory = inventory
}
func vend(selection: VendingSelection, quantity: Double) throws {
// add code
}
func deposit(amount: Double) {
// add code
}
}
inventory.updateValue(item, forKey: key) this is a problem. they said Argument type 'VendingItem' does not conform to expected type 'ItemType' how can i fix this problem please help me
1 Answer
Cindy Lea
Courses Plus Student 6,497 PointsYou post all this code & dont tell us what the error is or what you need help with. We are all students & dont have time to look through bulky code without any clues. You can also attach c ode crrectly so its easier to read.