Swift Test

A fun test on Swift I made for the iCapps Team Meeting on 2/7/2014.

Transcript

1. Swift Test!
   How much do *you* know about Swift?
   A fun test made for iCapps Team Meeting 2/7/2014
   

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2. Which of these statements won't
   compile?
   1. if  (beers  >  0)  consumeBeer()  
   2. if  beers  >  0  {  consumeBeer()  }  
   3. if  (beers  >  0)  {  consumeBeer()  }
   1
   

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3. 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
   

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4. Which of these is not valid Swift?
   1. class  iCapps  {}  
   2. enum  iCapps  {}  
   3. tuple  iCapps  {}  
   4. struct  iCapps  {}
   3
   

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5. 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  
   

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6. 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”  
   

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7. How do you declare class methods on
   a Swift class?
   1. class  
   2. static  
   3. both
   6
   

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8. 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
   

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9. Which of these is not a built in swift
   type?
   1. Boolean  
   2. Int  
   3. String
   8
   

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10. What is the equivalent of Objective-C’s
    dealloc in Swift?
    1. dealloc  
    2. dispose  
    3. deinit
    9
    

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11. What is the expected result?
    1. a  =  [  33,  44  ]    
      b  =  [  33,  55  ]    
    2. b  =  [  33,  55  ]    
      b  =  [  33,  55  ]  
    3. compiler  will  not  allow  it
    10
    let  a  =  [  33,  44  ]  
    let  b  =  a  
    b[1]  =  55  
    

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12. 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)  
    

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13. How do you declare an IBOutlet
    property?
    1. @IBOutlet  var  button:UIButton  
    1. var  button:UIButton(IBOutlet)  
    2. var  button:UIButton
    12
    

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14. 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
    

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