TerryCK

import Foundation

class ClassA {
    private lazy var cellType = CellType.footer
    
    init(_ x: Int) {
        self.cellType = .footer
        print("ClassA", self.cellType)
        type(of: self.cellType)
    }

TerryCK

 //: This is a companion Playground for the article "Swift Functors, Applicatives, and Monads in Pictures", available at http://www.mokacoding.com/blog/functor-applicative-monads-in-pictures/
//: The article itself is a translation of the original "Functors, Applicatives, and Monads in Pictures" written for Haskell by Aditya Bhargava, available at http://adit.io/posts/2013-04-17-functors,_applicatives,_and_monads_in_pictures.html
//:
//: ## Optional
//:
//: Optional is just a type

enum MyOptional<T> {
    case Some(T)
    case None

TerryCK

//
//  Language.swift

//
//  Created by Terry Chen on 2017/12/19.

//

import UIKit

TerryCK

import Foundation

protocol BatteryStatusProtocol {
    static var allStatus: [BatteryStatus] { get }
    mutating func setStatus<T: BinaryInteger>(input: T)
}
enum BatteryStatus: String, BatteryStatusProtocol {
    case full, medium, less, charging, notOffcial
}
// Implement

TerryCK

extension String {
    static var txtLocoal: String {
        return "txtLocoal".localized()
    }
    
    func localized() -> String {
        return "localized String \(self)"
    }
}

TerryCK

protocol Presentable {
    func presenting(with viewController: UIViewController)
}

extension Presentable where Self: UIViewController {
    
    func presenting(with viewController: UIViewController) {
        
        switch self {
        case let pushableViewContorller as Pushable:

TerryCK

extension BinaryInteger {
    func printPyramid() {
        guard self > 0 else { return }
        for i in 0...up {
//            let offset = i <= 9 ? "0" : ""
            let spaceStr = Array(repeating: " ", count: up - i).joined()
            let numsStr = Array(0...i).toString
//            let numsStr =  Array(repeating: "\(offset)\(i.specStringInternal)", count: i).joined()
            print(spaceStr + numsStr)

TerryCK

 import Foundation
 
 var array = [1,2,3,4]
 
 // read the `array` to property `getArray`, to properties in the same heap momery address, not copy data form `array` to `getArray` right now.
 let getArray = array
 array
 getArray
 
 address(of: array)

TerryCK

import Foundation

enum Status: Int {
    case modified, create
}
struct Model {
    var property: Int {
        didSet{ self.status = .modified }
    }
    var modelName: String {

TerryCK

class Person {
    var age: Int
    var residence: Residence?
    
    init(age: Int, resdience: Residence?) {
        self.age = age
        self.residence = resdience
    }
}
class Residence { var address: Address? }