VojtaStavik

// Objective-C:
user.userId = @"unknown";

if ([object isKinfOfClass:[NSDictionary class]]) {

  if ([[((NSDictionary *)object) objectForKey:@"user_id"] isKindOfClass:[NSString class]]) {
  
    user.userId = (NSString *)[((NSDictionary *)object) objectForKey:@"user_id"];
  }
}

VojtaStavik

class SSNTextField: UITextField {
    
    
    required init(coder aDecoder: NSCoder) {
        
        super.init(coder: aDecoder)
        registerForNotifications()
    }
    
    

VojtaStavik

class MainProcess {
    var shouldExit = false

    func start () {
        // do your stuff here
        // set shouldExit to true when you're done
    }
}

var runLoop : NSRunLoop

VojtaStavik

import Foundation

struct MyArray<Element> : CustomStringConvertible {
    
    var description: String {
        var mutableDescription = "["
        for i in 0..<count {
            mutableDescription += "\"\(elementAtIndex(i)) "
            if i != count - 1 {
                mutableDescription += ", "

VojtaStavik

import Foundation

class PointerBox<Element> {
    var pointer: UnsafeMutablePointer<Element>
    let count: Int
    init(pointer: UnsafeMutablePointer<Element>, count: Int) {
        self.pointer = pointer
        self.count = count
    }
    deinit {

VojtaStavik

  2 ==>  0 1 0
  6 ==>  1 1 0

VojtaStavik

      2 ==>  0 1 0
      6 ==>  1 1 0
  ---------------- 
  Different? ✓ ✗ ✗

VojtaStavik

  func calculateHammingDistance(x: Int, y: Int) -> Int {
    // Step 1: Find different bits

    // Step 2: Count them
    
  }

VojtaStavik

  func calculateHammingDistance(x: Int, y: Int) -> Int {
    // Step 1: Find different bits
    let differentBits = x ^ y
    
    // Step 2: Count them
    
  }

VojtaStavik

      2 ==>  0 1 0
      6 ==>  1 1 0
  ---------------- 
  2 ^ 6 ==>  1 0 0 // 100 in binary represents number 4