Swift Tutorial - Tutorialspoint

func exchange<T>(inout a: T, inout b: T) {

let temp = a

a = b

b = temp

}

var numb1 = 100

var numb2 = 200

println("Before Swapping Int values are: \(numb1) and \(numb2)")

exchange(&numb1, &numb2)

println("After Swapping Int values are: \(numb1) and \(numb2)")

var str1 = "Generics"

var str2 = "Functions"

println("Before Swapping String values are: \(str1) and \(str2)")

exchange(&str1, &str2)

println("After Swapping String values are: \(str1) and \(str2)")

When we run the above program using playground, we get the following result:

Before Swapping Int values are: 100 and 200

After Swapping Int values are: 200 and 100

Before Swapping String values are: Generics and Functions

After Swapping String values are: Functions and Generics

Associated Types

Swift allows associated types to be declared inside the protocol definition by the keyword
'typealias'.

protocol Container {

typealias ItemType

mutating func append(item: ItemType)

var count: Int { get }