bestiosdeveloper

var numbers = Array(1...15)

// Find the indices of all the even numbers
let indicesOfEvens = numbers.subranges(where: { $0.isMultiple(of: 2) })

// Perform an operation with just the even numbers
let sumOfEvens = numbers[indicesOfEvens].reduce(0, +)
// sumOfEvens == 56

// You can gather the even numbers at the beginning

bestiosdeveloper

@main
class NewAppDelegate: UIResponder, UIApplicationDelegate {
    static func main() {
        // Write some magical statement
    }
}

bestiosdeveloper

@UIApplicationMain
class AppDelegate: UIResponder, UIApplicationDelegate {
    
    var window: UIWindow?
  
    func application(_ application: UIApplication, didFinishLaunchingWithOptions launchOptions: [UIApplication.LaunchOptionsKey: Any]?) -> Bool {
        return true
    }
}

bestiosdeveloper

let locations = [(latitude: 63.3454, longitude: 12.4543), (latitude: 54.5434, longitude: 23.6434), (latitude: 63.2443, longitude: 23.7545)]
let origin = (latitude: 0.00, longitude: 0.00)

// error: Argument type '(latitude: Double, longitude: Double)' does not conform to expected type 'Equatable'
if locations.contains(origin) {
  // do some serious calculations here
}

// error: Referencing instance method 'sorted()' on 'Sequence' requires that '(latitude: Double, longitude: Double)' conform to 'Comparable'
let sortedLocations = locations.sorted()

bestiosdeveloper

enum Ranking: Comparable {
    case platinum(Int)  // <
    case gold  // <
    case silver  // <
    case bronze
}

let someRanks: = [Ranking.gold, Ranking.platinum(8), Ranking.bronze Ranking.platinum(10), Ranking.silver]

someRanks.sorted()

bestiosdeveloper

class Coder {
    var isCoding = false
    func perform(_ work: @escaping () -> Void) {
        work()
    }
    
    func startCoding() {
        perform { [self] in // <- Fix-it: capture 'self' explicitly to enable implicit 'self' in this closure. Fix-it: insert '[self] in'
            isCoding = true
        }

bestiosdeveloper

enum RocketError: Error {
    case insufficientFuel
    case insufficientAstronauts(needed: Int)
    case noAstronauts(message: String)
    case outOfFuel(message: String)
    case unknownError(message: String)
}


func igniteRockets(fuel: Int, astronauts: Int) throws {

bestiosdeveloper

class User {
    var age: Int = 0 {
    didSet { print("didSet for age") }
  }

    var name: String = "" {
    didSet { print(oldValue) }
  }
}

bestiosdeveloper

var firstProperty:[Model]? = nil
var secondProperty:[Model]? = [Model()]

firstProperty ??= [] // firstProperty is set since its value is .None
secondProperty ??= [] // secondProperty's value isn't changed since its value is .Some

bestiosdeveloper

//
//  CodableExtensionExample.swift
//
//  Created by Pramod Kumar on 05/15/20.
//  Copyright © 2020 Swift Commmunity. All rights reserved.
//

import UIKit

let json = """