swift.swift

// Source: https://docs.swift.org/swift-book/documentation/the-swift-programming-language/guidedtour/

print("Hello, world!")
// Prints "Hello, world!"

var myVariable = 42
myVariable = 50
let myConstant = 42

let apples = 3
let oranges = 5

let quotation = """
    Even though there's whitespace to the left,
    the actual lines aren't indented.
        Except for this line.
    Double quotes (") can appear without being escaped.

    I still have \(apples + oranges) pieces of fruit.
    """

var fruits = ["strawberries", "limes", "tangerines"]
fruits[1] = "grapes"

var occupations = [
    "Malcolm": "Captain",
    "Kaylee": "Mechanic",
]
occupations["Jayne"] = "Public Relations"

let individualScores = [75, 43, 103, 87, 12]
var teamScore = 0
for score in individualScores {
    if score > 50 {
        teamScore += 3
    }
    else {
        teamScore += 1
    }
}

let vegetable = "red pepper"
switch vegetable {
case "celery":
    print("Add some raisins and make ants on a log.")
case "cucumber", "watercress":
    print("That would make a good tea sandwich.")
case let x where x.hasSuffix("pepper"):
    print("Is it a spicy \(x)?")
default:
    print("Everything tastes good in soup.")
}
// Prints "Is it a spicy red pepper?"

@discardableResult
func greet(person: String, day: String) -> String {
    "Hello \(person), today is \(day)."
}
greet(person: "Bob", day: "Tuesday")

func calculateStatistics(scores: [Int]) -> (min: Int, max: Int, sum: Int) {
    var min = scores[0]
    var max = scores[0]
    var sum = 0

    for score in scores {
        if score > max {
            max = score
        }
        else if score < min {
            min = score
        }
        sum += score
    }

    return (min, max, sum)
}
let statistics = calculateStatistics(scores: [5, 3, 100, 3, 9])
print(statistics.sum)

class NamedShape {
    var numberOfSides: Int = 0
    var name: String

    init(name: String) {
        self.name = name
    }

    func simpleDescription() -> String {
        "A shape with \(numberOfSides) sides."
    }
}

class Square: NamedShape {
    var sideLength: Double

    init(sideLength: Double, name: String) {
        self.sideLength = sideLength
        super.init(name: name)
        numberOfSides = 4
    }

    func area() -> Double {
        sideLength * sideLength
    }

    override func simpleDescription() -> String {
        "A square with sides of length \(sideLength)."
    }
}

let test = Square(sideLength: 5.2, name: "my test square")
_ = test.area()
_ = test.simpleDescription()

enum Rank: Int {
    case ace = 1
    case two, three, four, five, six, seven, eight, nine, ten
    case jack, queen, king

    func simpleDescription() -> String {
        switch self {
        case .ace:
            return "ace"
        case .jack:
            return "jack"
        case .queen:
            return "queen"
        case .king:
            return "king"
        default:
            return String(self.rawValue)
        }
    }
}
let ace = Rank.ace

func fetchUserID(from server: String) async -> Int {
    if server == "primary" {
        return 97
    }
    return 501
}

Task {
    await fetchUserID(from: "primary")
}

protocol ExampleProtocol {
    var simpleDescription: String { get }
    mutating func adjust()
}

var fridgeIsOpen = false
let fridgeContent = ["milk", "eggs", "leftovers"]

func fridgeContains(_ food: String) -> Bool {
    fridgeIsOpen = true
    defer {
        fridgeIsOpen = false
    }

    let result = fridgeContent.contains(food)
    return result
}

if fridgeContains("banana") {
    print("Found a banana")
}
print(fridgeIsOpen)
// Prints "false"

let contentHeight = 40
let hasHeader = true
let rowHeight = contentHeight + (hasHeader ? 50 : 20)