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// Before
let start = 10
var i = start
while i < 5 {
    // do something

    i += 1
}

// After

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extension Signal {
    func observeUI() -> Signal<Value, Error> {
        return observe(on: UIScheduler())
    }
}

extension SignalProducer {
    func observeUI() -> SignalProducer<Value, Error> {
        return lift { $0.observeUI() }
    }

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class TVPodcastFlowLayout: UICollectionViewFlowLayout {

    override func prepare() {
        super.prepare()
        register(TVCollectionReusableView.self, forDecorationViewOfKind: TVCollectionReusableView.identifier)
    }

    override func layoutAttributesForElements(in rect: CGRect) -> [UICollectionViewLayoutAttributes]? {
        let attributes = super.layoutAttributesForElements(in: rect)
        var allAttributes = attributes

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import UIKit

extension UITableView
{
    // MARK: - Registering Cell Types
    /// Yields the built-in reuse identifier for the specified cell type.
    ///
    /// - parameter cellType: The cell type.
    private func reuseIdentifier<T: UITableViewCell>(cellType: T.Type) -> String
    {

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// http://swift.gg/2015/10/27/swift-pattern-matching-in-detail/
// 遍历目录

guard let enumerator = NSFileManager.defaultManager().enumeratorAtPath("/customers/2014/")
else { return }

for url in enumerator {
    switch (url.pathComponents, url.pathExtension) {

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import Foundation

extension Indexable {
    
    subscript(safeIndex safeIndex: Index) -> _Element? {
        return safeIndex.distance(to: endIndex) > 0 ? self[safeIndex] : nil
    }
    
}

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struct Stock {
    var name = ""
    var id = ""
}

let stock1 = Stock(name: "name", id: "1")
let stock2 = Stock(name: "name", id: "2")
let stock3 = Stock(name: "name", id: "3")
let stock4 = Stock(name: "name", id: "4")
let stock5 = Stock(name: "name", id: "5")

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// http://www.futantan.com/2016/04/14/NSTimer-tips/#more

extension NSTimer {
  private class FTTimerClosureWraper {
    private (set) var timerClosure: () -> ()
    
    init(timerClosure: () -> () ) {
      self.timerClosure = timerClosure
    }
  }

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import Foundation

typealias JSONDict = [String: Any]

struct Parameter<A> {
    let apiDescription: String
    let parse: (Any) -> A?
}

extension Parameter {

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import Foundation
import Dispatch
import PlaygroundSupport

PlaygroundPage.current.needsIndefiniteExecution = true

precedencegroup Additive {
    associativity: left
}