Which of these statements declares cityArray as a mutable array?

Which of these collection types is not included by default in standard Swift?

What happens when Swifts String, Array, and Dictionary objects are assigned to a new constant or variable?

What is the most basic difference between Value and Reference types?

What is the type of Swift Enumerations?

Symbol used like a tuple to access arguments in Abbreviated Swift Closure syntax?

How to extract a string from URL data?

Which statements are true about Tuple?

In Swift, what are the benefits of classes?

When the following code is executed, what it will do? funcfunc() { let layer = UIApplication.sharedApplication().keyWindow!.layer let scale = UIScreen.mainScreen().scale UIGraphicsBeginImageContextWithOptions(layer.frame.size, false, scale); layer.renderInContext(UIGraphicsGetCurrentContext()!) let s = UIGraphicsGetImageFromCurrentImageContext() UIGraphicsEndImageContext() UIImageWriteToSavedPhotosAlbum(s, nil, nil, nil) }

Select the most proper answer. import UIKit import AVFoundation … … … let r:AVAudioRecorder? do { r = try AVAudioRecorder(URL: soundFileURL, settings: rSettings) r.delegate = self r.meteringEnabled = true r.prepareToRecord() } catch let error as NSError { r = nil print(error.localizedDescription) }