KentaKudo

let result = 2 + 3 + 4  // 左から

var str1: String?
var str2: String?
let string = str1 ?? str2 ?? "string" // 右から

let int1 = 1
let int2 = 2
let int3 = 3
int1 == int2 == int3 // エラー

KentaKudo

// 矛盾
func contradiction(p: Bool, q: Bool) -> Bool {
    return false
}

// トートロジー
func tautology(p: Bool, q: Bool) -> Bool {
    return true
}

KentaKudo

import Foundation

// encode single UInt32 number
func vbEncodeNumber(n: UInt32) -> [UInt8] {
    var n = n
    var result = [UInt8]()
    while true {
        let byte = n % 128
        result.insert(UInt8(byte), at: 0)
        if n < 128 {

KentaKudo

// standard
[1,2,3,4,5,6,7].contains(3)

// alternative
protocol A {
    func `is`(in haystack: [Self]) -> Bool
    func `is`(in haystack: Self...) -> Bool
}

extension A where Self: Comparable {

KentaKudo

const { combineReducers } = Redux;
const todoApp = combineReducers({
  todos,
  visibilityFilter
});

let nextTodoId = 0;
const addTodo = (text) => {
  return {
    type: 'ADD_TODO',

KentaKudo

# pow(3, 8) = 6561
options = ['', '+', '-']
for i in options:
     for j in options:
         for k in options:
             for l in options:
                 for m in options:
                     for n in options:
                         for o in options:
                             for p in options:

KentaKudo

import Foundation

enum Token: Character {
    case A = "A"
    case B = "B"
    case C = "C"
    case D = "D"
    case E = "E"
    case F = "F"
    case G = "G"

KentaKudo

public struct Enigma {
    
    private var rotorBox: RotorBox
    private let plugboard: Cipher
    
    public typealias Key = (Token, Token, Token)
    public init(rotor0: @escaping Cipher, rotor1: @escaping Cipher, rotor2: @escaping Cipher, plugboard: @escaping Cipher, key: Key) {
        self.rotorBox = RotorBox(
            rotor0: RotorBox.Rotor(rotor0, position: key.0),
            rotor1: RotorBox.Rotor(rotor1, position: key.1),

KentaKudo

public typealias Cipher = (Token) -> (Token)

KentaKudo

public enum Token: Character {
    case A = "A", B = "B", C = "C", D = "D", E = "E", F = "F"
    case G = "G", H = "H", I = "I", J = "J", K = "K", L = "L"
    case M = "M", N = "N", O = "O", P = "P", Q = "Q", R = "R"
    case S = "S", T = "T", U = "U", V = "V", W = "W", X = "X"
    case Y = "Y", Z = "Z"
}