dodomarocgenex

Useful Spacemacs commands

• SPC q q - quit
• SPC w / - split window vertically
• SPC w - - split window horizontally
• SPC 1 - switch to window 1
• SPC 2 - switch to window 2
• SPC w c - delete current window
• SPC TAB - switch to previous buffer
• SPC b b - switch buffers

dodomarocgenex

System Design Cheatsheet

Picking the right architecture = Picking the right battles + Managing trade-offs

Basic Steps

1. Clarify and agree on the scope of the system

• User cases (description of sequences of events that, taken together, lead to a system doing something useful)
  • Who is going to use it?
  • How are they going to use it?

dodomarocgenex

extension UIView {
    var allSubViews : [UIView] {
        
        var array = [self.subviews].flatMap {$0}
        
        array.forEach { array.append(contentsOf: $0.allSubViews) }
        
        return array
    }
}

dodomarocgenex

You can use a flag and store it via NSUserDefaults.

extension UserDefaults {

    private static let didLaunchAppOnceKey = "didLaunchAppOnce"

    var didLaunchAppOnce: Bool {
        get { return bool(forKey: UserDefaults.didLaunchAppOnceKey) }
        set { set(newValue, forKey: UserDefaults.didLaunchAppOnceKey) }
    }

dodomarocgenex

import Foundation
import UIKit
import PlaygroundSupport

let someView = UIView(frame: CGRect(x: 0, y: 0, width: 400, height: 200))
someView.backgroundColor = UIColor.red
PlaygroundPage.current.liveView = someView

dodomarocgenex

import Foundation

public extension String {
    public func rangeFromNSRange(aRange: NSRange) -> Range<String.Index> {
        let s = advance(self.startIndex, aRange.location)
        let e = advance(self.startIndex, aRange.location + aRange.length)
        return s..<e
    }
    public var ns : NSString {return self as NSString}
    public subscript (aRange: NSRange) -> String? {

dodomarocgenex

//in viewDidLoad

enum Suit {
    case Clubs, Diamonds, Hearts, Spades
}

enum Rank {
    case Jack, Queen, King, Ace
    case Num(Int)
}

dodomarocgenex

enum Suit {
            case Clubs, Diamonds, Hearts, Spades
        }
        
        enum Rank {
            case Jack, Queen, King, Ace
            case Num(Int)
        }
        
        struct Card {