keybuk

var citiesVisited: [String: [String]] = [:]

let state = "California"
let city = "Eureka"

if let _ = citiesVisited[state] {       // Dislike the discarded lookup here.
    citiesVisited[state]!.append(city)  // Very dislike the ! here.
} else {
    citiesVisited[state] = [city]
}

keybuk

struct Person {
    var firstName, lastName: String
}

let john = Person(firstName: "John", lastName: "Doe")

protocol Withable {

    func with(changes: (inout Self) -> Void) -> Self

keybuk

//
//  FetchedResults.swift
//  DungeonMaster
//
//  Created by Scott James Remnant on 3/14/16.
//  Copyright © 2016 Scott James Remnant. All rights reserved.
//

import CoreData
import Foundation

keybuk

func inSimulator() -> Bool { return TARGET_OS_SIMULATOR != 0 }
if inSimulator() {
  // In simulator
} else {
  // Not in simulator
}

keybuk

var y = NSOrderedSet(orderedSet: my)

struct CastingGenerator<G: GeneratorType, T>: GeneratorType {
    
    typealias Element = T
    
    var base: G
    
    init(_ base: G) {
        self.base = base

keybuk

Up Next

So here's how I think Music/iTunes works, and how I think iTunes handles the crazy-assed "Up Next" system and why it doesn't make sense to anyone.

When you press Play on any single track, that begins playing (duh). But also, Music/iTunes takes a look at the context in which you pressed Play, e.g. the alphabetical list of songs, whether you have Shuffle on, etc. and figures out what it might play next:

• Now Playing:
  • Ain't Goin' to Goa
• Playing Next:

keybuk

public enum Model: String {
    case Company
    case Team
    case Employee
}

extension NSEntityDescription {
    public class func entity(model: Model, inManagedObjectContext context: NSManagedObjectContext) -> NSEntityDescription {
        // Since we know we always have a matching entity, we can just force-unwrap this.
        return NSEntityDescription.entityForName(model.rawValue, inManagedObjectContext: context)!

keybuk

import UIKit

class ViewController: UIViewController, UICollectionViewDataSource {
    
    @IBOutlet weak var collectionView: UICollectionView?

    var data = [ "🍅", "🍍", "🍎"  ]

    override func viewDidLoad() {
        super.viewDidLoad()

keybuk

First we set up a struct, a by-value type:

  1> struct Point { 
  2.     var x, y: Int 
  3. }
  
And we make an array of them:

  4> var points = [Point]()
points: [(Point)] = 0 values

keybuk

@ Discovering: 0x00 (6)
< HCI Command: LE Set Random Address (0x08|0x0005) plen 6     [hci0] 653.360430
        Address: 29:C6:32:82:FB:DC (Non-Resolvable)
> HCI Event: Command Complete (0x0e) plen 4                   [hci0] 653.361283
      LE Set Random Address (0x08|0x0005) ncmd 1
        Status: Success (0x00)
< HCI Command: LE Set Scan Parameters (0x08|0x000b) plen 7    [hci0] 653.361356
        Type: Active (0x01)
        Interval: 11.250 msec (0x0012)
        Window: 11.250 msec (0x0012)