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Vending machine with long vend() function
struct Item {
var price: Int
var count: Int
}
enum VendingMachineError: ErrorType {
case InvalidSelection
case InsufficientFunds(coinsNeeded: Int)
case OutOfStock
}
class VendingMachine {
var inventory = [
"Candy Bar": Item(price: 12, count: 7),
"Chips": Item(price: 10, count: 4),
"Pretzels": Item(price: 7, count: 11)
]
var coinsDeposited = 0
func dispense(snack: String) {
print("Dispensing \(snack)")
}
func vend(itemNamed name: String) throws {
guard var item = inventory[name] else {
throw VendingMachineError.InvalidSelection
}
guard item.count > 0 else {
throw VendingMachineError.OutOfStock
}
guard item.price <= coinsDeposited else {
throw VendingMachineError.InsufficientFunds(coinsNeeded: item.price - coinsDeposited)
}
coinsDeposited -= item.price
--item.count
inventory[name] = item
dispense(name)
}
}
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