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let array: Array<Int> = [1, 2, 3]

func double(input: Int) -> Int {
    return input * 2
}

let mappedArray = array.map { value in
    return double(input: value)
}

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Pair-Programming Introduction

Yoshikuni Kato

---

What is Pair-Programming?

• Two people do programming together
• Originated from Extreme Programming, which is one origin of Agile method

---

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import UIKit

struct Style<View: UIView> {
    let apply: (View) -> View
    
    // from swift 5.2
    func callAsFunction(_ view: View) -> View {
        apply(view)
    }
}

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import UIKit
import PlaygroundSupport

// 1. define style as function



// 2. make syntax readable

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import UIKit
import PlaygroundSupport

// 1. define style as function
typealias ViewStyle = (UIView) -> UIView

let cornerRadius10: ViewStyle = { view -> UIView in
    view.layer.cornerRadius = 10.0
    return view
}

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Things to install

• Chrome
• Xcode
• SourceTree
• Atom
• Iterm2 & Prezi
  • need to configure .zpreztorc to enable git integration
• BetterTouchTool
• Deckset
• Slack

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typealias Completion<Value, Error: Swift.Error> = (Result<Value, Error>) -> Void
typealias TaskHandler<Value, Error: Swift.Error> = (@escaping Completion<Value, Error>) -> Void

struct Task<Value, Error: Swift.Error> {
    private let handler: TaskHandler<Value, Error>

    init(_ handler: @escaping TaskHandler<Value, Error>) {
        self.handler = handler
    }

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enum SingleOrMultiple<Value> {
    case single(Value)
    case multiple([Value])
    
    func map<T>(_ transform: (Value) throws -> T) rethrows -> SingleOrMultiple<T> {
        switch self {
        case let .single(value): return .single(try transform(value))
        case let .multiple(values): return .multiple(try values.map(transform))
        }
    }

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class CustomNavigationController: UINavigationController {

    var token: NSKeyValueObservation?
    override func viewDidLoad() {
        super.viewDidLoad()

        token = self.observe(\.viewControllers) { observed, change in
            print(observed)
            print(change)
        }

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前提

プロジェクトの性質

（規模、期間、運用の有無、注力する点、制約、一般的なプロジェクトとの違いなど）

プロダクトの性質

（使う技術、Framework、対応OS、対応端末など）

開発者のモチベーション

（やりたいこと、最近の流行、前のプロジェクトの反省点など）