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Swift Test - Answers
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Tom Adriaenssen
July 02, 2014
Programming
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490
Swift Test - Answers
The answers for a fun test on Swift I made for the iCapps Team Meeting on 2/7/2014.
Tom Adriaenssen
July 02, 2014
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Transcript
Swift Test! The answers…
Which of these statements won't compile? 1. if (beers >
0) consumeBeer() 2. if beers > 0 { consumeBeer() } 3. if (beers > 0) { consumeBeer() } 1
How would you declare a variable named awesome of type
Double in Swift? 1. Double awesome 2. var:double awesome 3. var awesome:Double 2
Which of these is not valid Swift? 1. class iCapps
{} 2. enum iCapps {} 3. tuple iCapps {} 4. struct iCapps {} 3
Given: ! what is the result of: 1. stringValue ==
nil 2. stringValue == “Justin Gif” 3. the compiler wont allow it 4 var stringValue:String = “Justin Gif” stringValue = nil
Given Objective-C: ! How would the Swift equivalent look? 1.
rootController?.view?.label?.text = “OHAI” 2. rootController.view.label.text = “OHAI” 3. if rootController != nil { if rootController.view != nil { if rootController.view.label != nil { rootController.view.label.text = “OHAI” } } } 5 rootController.view.label.text = @“OHAI”
How do you declare class methods on a Swift class?
1. class 2. static 3. both 6
What is the mutating keyword for? 1. Indicates a class
can mutate its properties 2. Indicates a method on a struct changes the struct’s values 3. Indicates that a variable will change during its lifetime 7
Which of these is not a built in swift type?
1. Boolean 2. Int 3. String 8
What is the equivalent of Objective-C’s dealloc in Swift? 1.
dealloc 2. dispose 3. deinit 9
What is the expected result? 1. a = [ 33,
44 ] b = [ 33, 55 ] 2. a = [ 33, 55 ] b = [ 33, 55 ] 3. compiler will not allow it 10 let a = [ 33, 44 ] let b = a b[1] = 55
What is the expected result? 1. a = [ 33,
44 ] b = [ 33, 44, 55 ] 2. a = [ 33, 44, 55 ] b = [ 33, 44, 55 ] 3. compiler will not allow it 11 let a = [ 33, 44 ] let b = a b.append(55)
How do you declare an IBOutlet property? 1. @IBOutlet var
button:UIButton 2. var button:UIButton(IBOutlet) 3. var button:UIButton<outlet> 12
let firstString:String? = “abc” let secondString:String! = “abc”
Which of these lines will compile? 1. print firstString? print secondString! 2. print firstString! print secondString 3. print firstString? print secondString 4. print firstString print secondString 13