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func something(value: Float) {
    print("float")
}

func something(value: Double) {
    print("double")
}

something(value: 0.1234) //double
something(value: 0.1234) //double

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extension UITableView {
    func register<Cell: UITableViewCell>(for cell: Cell) {
        let nib = UINib(nibName: cell.className(), bundle: nil)
        register(nib, forCellReuseIdentifier: cell.className())
    }

    func dequeueReusableCell<Cell: UITableViewCell>(for indexPath: IndexPath) -> Cell {
        return dequeueReusableCell(withIdentifier: Cell.className(), for: indexPath) as! Cell
    }
}

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let itDoesntDoWhatYouThinkItDoes = Int8(NSNumber(value: Int64.max)) 
// -1

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class Parent {
    enum Section {
        case hoge1
        case hoge2
        case hoge3
        case hoge4
    }
}

final class Child : Parent {

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protocol Associatable {
  var associatedValue: Any {
}

enum Hoge: Associatable {
  case fuga(a: String)
  
  var associatedValue: Any {
     switch self {
       case fuga(let a): return a

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Concurrency in Swift: One possible approach

Author: Chris Lattner

Contents

• Introduction
• Overall Vision
• Part 1: Async/await: Beautiful asynchronous APIs
• Part 2: Actors: Eliminating shared mutable state

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enum ZodiacSign: Int {
    case aries          // ♈
    case taurus         // ♉
    case gemini         // ♊
    case cancer         // ♋
    case leo            // ♌
    case virgo          // ♍
    case libra          // ♎
    case scorpius       // ♏
    case sagittarius    // ♐

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extension BinaryInteger {
    var isEven: Bool {
        return self % 2  == 0
    }
}

arc4random_uniform(10).isEven

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// This extension is only available on iOS prior to 10.0. 
// If you want to use on iOS 10.0 and later, please use ISO8601DateFormatter
extension DateFormatter {
    @available(*, obsoleted: 10.0, message: "use ISO8601DateFormatter")
    static let iso8601: DateFormatter = {
        let formatter = DateFormatter()
        formatter.calendar = Calendar(identifier: .iso8601)
        formatter.locale = Locale(identifier: "en_US_POSIX")
        formatter.timeZone = TimeZone(secondsFromGMT: 0)
        formatter.dateFormat = "yyyy-MM-dd'T'HH:mm:ss.SSSXXXXX"

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let data: Data = """
{
"id": 1,
"url": ""
}
""".data(using: .utf8)!

struct Hoge: Codable {
    let id: Int
    private let jsonUrl: String?