yoching

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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Things to install

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

yoching

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
}

yoching

import UIKit
import PlaygroundSupport

// 1. define style as function



// 2. make syntax readable

yoching

import UIKit

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

yoching

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

---

yoching

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)
}