WorldDownTown

let displayLink = CADisplayLink(target: self, selector: Selector("update:"))
displayLink.addToRunLoop(NSRunLoop.currentRunLoop(), forMode: NSRunLoopCommonModes)

WorldDownTown

-- 1. リストを引数に取って、length に π (=3.1415)を返す関数
pieTime x = fromIntegral (length x)  + (pi :: Float)

-- 2. 2つの文字列を引数にとって、数値として足し算する関数
addString x y = (read x::Int) + (read y::Int)

-- 3. 文字列を逆する関数
reverse' x = [x !! z | z <- [((length x) - 1), ((length x) - 2)..0]]

-- 4. 文字列が回文かどうかを判定する関数 isPalindrome

WorldDownTown

#coding:utf-8
#Xcode上の不要なファイルを抽出するスクリプト

puts "- start class file #{Time.now.strftime("%Y/%m/%d %H:%M:%S")}"
class_waste_count = 0

#クラスファイルの一覧を取得
result = `find ~/SampleProject -type f -name "*.h" -exec basename {} \\; | sort`
class_filenames = result.split("\n")

WorldDownTown

void objc_setAssociatedObject(id object, const void *key, id value, objc_AssociationPolicy policy)

// id object: プロパティを持たせたいオブジェクト
// void *key: プロパティのアドレス (static で宣言した不変なローカルな静的変数を指定する)
// id value: 保持させるのオブジェクト
// objc_AssociationPolicy policy: 関連付けの方法 (後述)

WorldDownTown

func reduce<T,R>(list: [T], block: (([R],T) -> R?)) -> [R]? {
    var acc = [R]()
    for x in list {
        if let val = block(acc, x) {
           acc += [val]
        }
    }
    
    return acc
}

WorldDownTown

package main


import (
	"fmt"
	"math/rand"
	"sort"
	"time"
)

WorldDownTown

public final class Extension<Base> {
    public let base: Base
    public init(_ base: Base) {
        self.base = base
    }
}

public struct StaticExtension<Base> { }

public protocol ExtensionCompatible {

WorldDownTown

import UIKit
import PlaygroundSupport

import UIKit

final class TimerIndicator: UIView {
    deinit {
        displayLink?.invalidate()
    }

WorldDownTown

import PlaygroundSupport
import UIKit

final class LoadingIndicator: UIView {
    var color: UIColor = .blue
    private var index: Int = 0
    private let lap: TimeInterval = 2
    private let movingAngle: CGFloat = 5 / 6 * .pi2
    private let rotationCount: Int = 6
    private let minimumAngle: CGFloat = .pi2 / 24

WorldDownTown

import PlaygroundSupport
import UIKit

final class RippleCheckmark: UIView {
    private let circleLayer: CAShapeLayer = .init()
    private let rippleLayer: CAShapeLayer = .init()
    private let checkmarkLayer: CAShapeLayer = .init()
    private var completion: (() -> Void)?
    var fillColor: UIColor = .blue {
        didSet { update() }