jimmythai

// ### Con's of the UITableView's `register` and `dequeue` methods
// - You have to use String for `reusableIdentifier`.
// - The interfaces for nib and class are different.
// - When you dequeue cells, you have to cast them as custom classes.

protocol Reusable: class {
    static var reusableIdentifier: String { get }
}

extension Reusable {

jimmythai

class Dog {
  private (set) var name = ""
  
  func change(name: String) {
    self.name = name
  }
}

let dog = Dog()
print(dog.name) // This is ok

jimmythai

// Somthing like this:
var current = 1
while current * current <= 100 {
    current += 1
}
result = current * current

// To this:
let result = (1...)
   .lazy

jimmythai

///////////////////////////////////////////////////////////////////////////////////////////////////////////////
// The key questions we ask ourselves in these cases is: does the nil value occur due to a programmer error? //
///////////////////////////////////////////////////////////////////////////////////////////////////////////////

// Somthing like this:
let url: URL? = URL(string: "https://gist.github.com")

// To this:
let url: URL = URL(string: "https://gist.github.com")!

jimmythai

// Somthing like this:
func parseElement(name: String, text: String) {
    let trimmed = text.trimmingCharacters(in: .whitespaces)
    if name == "trk" {
        let t = trimmed
        // process element
    } else if name == "ele" {
        guard let elevation = Int(trimmed) else { return }
    } else {
        // no need to trim text

jimmythai

// Create a dispatch group
let userListDispatchGroup = DispatchGroup()

// Get List of Users
userListDispatchGroup.enter()
Alamofire.request("https://httpbin.org/get?users").validate().responseJSON { response in

    switch response.result {
    case .success:
        print("Get User Successful")

jimmythai

import Foundation

// MARK: UserDefaults extension
extension UserDefaults {
    struct SomeApp: UserDefaultable {
        enum UserDefaultKey: String {
            case someItem
        }
        
        private init() {}

jimmythai

import Foundation

// MARK: UserDefaults extension
extension UserDefaults {
    struct SomeApp: UserDefaultable {
        enum UserDefaultKey: String {
            case someItem
        }
        
        private init() {}

jimmythai

////////////////////////
// MARK: Array
////////////////////////

// map function
extension Array {
    func map<T>(_ transform: (Element) throws -> T) rethrows -> [T] {
        var result: [T] = []
        result.reserveCapacity(count)
        

jimmythai

import UIKit

extension UIView {
    
    @IBInspectable var borderColor: UIColor? {
        get {
            return layer.borderColor.map { UIColor(cgColor: $0) }
        }
        set {
            layer.borderColor = newValue?.cgColor