wotjd

public struct ArraySlice<Element> {
  ...
  @inlinable public func map<T>(_ transform: (Element) throws -> T) rethrows -> [T]
  ...
}

wotjd

// https://ko.wikipedia.org/wiki/함자_(수학)

struct F<X> {
    let x : X?
    
    init(_ x: X?) { self.x = x }
    
    func map<Y>(_ f : @escaping (X) -> Y?) -> F<Y> {
        guard let x = self.x else {
            return F<Y>(nil)

wotjd

import Foundation

DispatchQueue.global().sync {
    print("hi")
}

print("good")


let serial = DispatchQueue(label: "Serial")

wotjd

import AVFoundation

// Get H264/HEVC Parameter Set
private func getParameterSet(_ sampleBuffer: CMSampleBuffer) -> Data {
    var parameterSet = Data()
    let codecStartCode =  [UInt8](arrayLiteral: 0x00, 0x00, 0x00, 0x01)
    parameterSet.append(contentsOf: codecStartCode)
    let description = CMSampleBufferGetFormatDescription(sampleBuffer)!
    
    var numParams = 0

wotjd

import Foundation 

extension ExpressibleByIntegerLiteral {
    var bytes: [UInt8] { return withUnsafeBytes(of: self) { Array($0) } }
}

var id = UInt8(exactly: 1)!
var count = UInt8(exactly: 2)!
var timeStart = UInt64(exactly: 0x1234567898765432)!
var timeEnd = UInt64(exactly: 4)!

wotjd

import Foundation

protocol Receivable {
    init?(from: Data)
}

extension Receivable where Self: Decodable {
    init?(from jsonData: Data) {
        guard let decoded = try? JSONDecoder().decode(Self.self, from: jsonData) else { return nil }
        self = decoded

wotjd

import Moya
import Foundation

guard let case MoyaError.underlying(nsError as NSError, _) = error else { return }

let unknownHostError = [
    NSURLErrorUnknown, 
    NSURLErrorCannotFindHost, 
    NSURLErrorDomain, 
    NSURLErrorCancelled, 

wotjd

import UIKit

class CustomButton {
  var containingTouchViews: [UIView] = []

  override func point(inside point: CGPoint, with event: UIEvent?) -> Bool {
    self.containingTouchViews
      .map { view in 
        view.frame.contains(self.convert(point, to: view))
          // below codes are optional

wotjd

import UIKit

class CustomRoundableButton: UIButton {
  @IBInspectable var rounded: Bool = false {
    didSet { self.updateCornerRadius() }
  }
  var cornerRadius: CGFloat?
  
  override func layoutSubviews() {
    super.layoutSubviews()

wotjd

/*
id.txt example:

stringid1
stringid2
...

eng.txt example:

hello