a2

{
    // must be 1
    "formatVersion": 1,
    
    // required for "dynamic" passes
    "authenticationToken": "<secret>",
    "serialNumber": "<secret>",
    "webServiceURL": "https://pass.a2.io/",

    // top-left "logo" text

a2

// Version A
// - crashes if viewControllers is empty
// - crashes if first VC is not of type MyViewController
let navigationController = ...
let myViewController = navigationController.viewControllers.first as! MyViewController
myViewController.configurationObject = ...

// Version B
// - doesn't crash, ever
// - does nothing if viewControllers is empty or the first is not of type MyViewController

a2

import Guaka

enum MainError: Error, CustomStringConvertible {
    case example
    
    var description: String {
        switch self {
        case .example:
            return "This is an example error."
        }

a2

import UIKit

protocol ViewProtocol { 
    var view: UIView { get }
}

extension ViewProtocol where Self: UIView {
    var view: UIView {
        return self
    }

a2

guard !arguments.isEmpty,
    nums.count = arguments.count
else {
    print("Usage: \(appName) <list-of-positive-integers>")
    exit(-1)
}

a2

infix operator <+ {}

func <+ <C: RangeReplaceableCollectionType>(inout collection: C, element: C.Generator.Element) {
  collection.append(element)
}

var array = [String]()
array <+ "Foo"
array <+ "Bar"

a2

// ----
// libsass (v3.2.5)
// ----

@function at2x-name($filename) {
  $length: str-length($filename);
  @if $length == 0 {
    // return empty if input is empty
    @return $filename;
  }

a2

sqlite3 -column ~/Library/Safari/history.db 'SELECT "visit_count", "url" FROM "history_items" ORDER BY "visit_count" DESC LIMIT 5;'

a2

extension RangeReplaceableCollectionType {
    init<S: SequenceType where S.Generator.Element == Self.Generator.Element>(sequence: S) {
        self.init()
        extend(sequence)
    }
}

extension RangeReplaceableCollectionType where Index: IntegerType {
    init<S: SequenceType where S.Generator.Element == Self.Generator.Element>(sequence: S) {
        self.init()

a2

Verifying I am +a2 on my passcard. https://onename.com/a2