AppleCEO

func **<T: Multipleiable> (lhs: T, rhs: T) -> T {
    return lhs * rhs
}

AppleCEO

struct Point {
    let x: Int, y: Int
    
    var description: String {
        return "(\(x), \(y))"
    }
}

let p = Point(x: 21, y: 30)

AppleCEO

struct Point {
    let x: Int, y: Int
}

let p = Point(x: 21, y: 30)

print(p)
// Prints "Point(x: 21, y: 30)"

AppleCEO

struct Point: CustomStringConvertible {
    let x: Int, y: Int

    var description: String {
        return "(\(x), \(y))"
    }
}

let p = Point(x: 21, y: 30)
let s = String(describing: p)

AppleCEO

class Point: CustomStringConvertible {
    let x: Int, y: Int

    var description: String {
        return "(\(x), \(y))"
    }
    
    init(x: Int, y: Int) {
        self.x = x
        self.y = y

AppleCEO

let string = "a b c d e f"
let stringSplited = string.split(separator: " ")
// stringSplited is String.SubSequence type

AppleCEO

typealias MyInt = Int
typealias YourInt = Int

let age : MyInt = 10  //  MyInt 는 Int 의 다른 이름입니다.
let year : YourInt = 20  //  YourInt 는 Int 의 다른 이름입니다.
let sum : Int

sum = year + age
// result: 30

AppleCEO

let input = readLine()

AppleCEO

let input = readLine()

if let inputed = input {
    print(inputed)
} else {
    print("Non inputed")
}

AppleCEO

struct MyPoint {
    private(set) var x = 0
    private(set) var y = 0
    
    init(x: Int = 0, y: Int = 0) {
        self.x = x
        self.y = y
    }
}