sunshinejr

//: #typealias & associatedtype magic

//: ##Let's make a protocol without typealias (now associatedtype)
protocol Testable {
    
}

//: ##And another one with typealias
//: You could think, that the below typealias is just making
//: a typealiast for Int. In fact, we actually created a 

sunshinejr

let currencies = [CurrencyProtocol]()

sunshinejr

struct ReallyImportantCurrencyStruct: CurrencyProtocol {

    func currencyFunction() -> ReallyImportantCurrencyStruct.Currency { 
        return 2.0
    }
}

let currency = ReallyImportantCurrencyStruct()
print(currency.currencyFunction())

sunshinejr

protocol CurrencyProtocol {
    typealias Currency = Double
}

sunshinejr

struct ReallyImportantCurrencyStruct { 
    typealias Currency = Double
}

sunshinejr

protocol CurrencyProtocol { }

extension CurrencyProtocol {
    typealias Currency = Double
}

sunshinejr

//: #Default associatedtype & overriding
//: Let's make an example of how can you use default associatedtype, to make clear what
//: it really does.
//: We will create generic protocol for Container, with associatedtype for ItemType.
//: Our ItemType will haave a default value of Int.

protocol Container {
    
    associatedtype ItemType = Int