AppleCEO

enum Planet: Int {
    case mercury, venus, earth, mars, jupiter, saturn, uranus, neptune
}

AppleCEO

enum Planet: Int {
    case mercury = 1, venus, earth, mars, jupiter, saturn, uranus, neptune
}

AppleCEO

enum CompassPoint: String {
    case north, south, east, west
}

AppleCEO

// function
func backward(_ s1: String, _ s2: String) -> Bool {
    return s1 > s2
}

// closure
{ (_ s1: String, _ s2: String) -> Bool in
    return s1 > s2
}

AppleCEO

let names = ["Chris", "Alex", "Ewa", "Barry", "Daniella"]

let namesSorted1 = names.sorted(by: { (_ s1: String, _ s2: String) -> Bool in
    return s1 > s2
})
let namesSorted2 = names.sorted(by: { (_ s1: String, _ s2: String) -> Bool in
    s1 > s2
})
let namesSorted3 = names.sorted(by: { (s1, s2) -> Bool in s1 > s2 })
let namesSorted4 = names.sorted(by: { (_ s1: String, _ s2: String) in s1 > s2 })

AppleCEO

let numbers = [20, 19, 7, 12]
let threeTimesNumbers = numbers.map({ (number: Int) -> Int in
    let result = 3 * number
    return result
})
// [60, 57, 21, 36]

AppleCEO

let numbers = [20, 19, 7, 12]
var threeTimesNumbers = [Int]()
for number in numbers {
    threeTimesNumbers.append(number*3)
}
// [60, 57, 21, 36]

AppleCEO

let digitNames = [
    0: "Zero", 1: "One", 2: "Two",   3: "Three", 4: "Four",
    5: "Five", 6: "Six", 7: "Seven", 8: "Eight", 9: "Nine"
]
let numbers = [16, 58, 510]

let strings = numbers.map { (number) -> String in
    var number = number
    var output = ""
    repeat {

AppleCEO

let scores = [10, 80, 95, 100, 92]

let hasPassedExam = scores.filter({ (score: Int) -> Bool in
    return score > 80
})
// [95, 100, 92]

AppleCEO

let scores = [90, 58, 36, 82]
let hasPassedExam = scores.map({ (score: Int) -> String in
    if score > 80 { return "합격" }
    return "불합격"
})
// ["합격", "불합격", "불합격", "합격"]