Nested Function using closure - Swift

//nested function using closure 

func nestedMultiplyFunc (First : Int, second :Int) -> () -> Int{

    var item = First

    func nestedClosure () -> Int{

    

        item *= second

        return item

    }

    return nestedClosure

}

var number = nestedMultiplyFunc(First: 8, second: 9)

print(number())

print(number())

Odd / Even Number - Closure - Swift

var OddEvenNumbers : ([Int]) -> ([Int] , [Int]) = { numbers -> ([Int], [Int]) in

    var evenArray = [Int]()

    var oddArray = [Int]()

    

    for item in numbers{

    

        item % 2 == 0 ? evenArray.append(item) : oddArray.append(item)

    }

    

    return (evenArray , oddArray)

}

OddEvenNumbers([2,6,8,6,9,5,9,54,78])

Introduction to Delegate / Closure - Swift

Create a protocol IOSDeveloper , who can make applications for you //protocol are just blueprints . only declarations goes here..

protocol IOSDeveloper{

    func canMakeApplication(name:String)

}

Create a developer --> who actually create application

//conform it to that protocol 

//implement function -- canMakeApplication 

struct Developer : IOSDeveloper

{

    func canMakeApplication(name: String) {

        print("yes i can make IOS application \(name)")

    }

}

//create a dev object and ask if he can create application?

var vijay = Developer()

vijay.canMakeApplication(name: "vijay")

//create Client --> who want to create application

//As client don't know programming , so assign a delegate IOSDeveloper

struct Client {

    var delegate : IOSDeveloper?

}

//Create a client object 

//Assign developer object to client 

//And ask if he can create application for him

var myClient = Client()

myClient.delegate = vijay

myClient.delegate?.canMakeApplication(name: "client")

                       Closure

//by closure

struct Client {

    var makeApp : () -> Void = {}

    

    func DeveloperNeeded() {

        makeApp()

    }

}

struct Developer {

    func makeApp(){

    print("I am building apps for clients")

    }

}

var vijay = Developer()

var james = Client()

james.makeApp = vijay.makeApp

james.DeveloperNeeded()