Swift (Programming Language) Test

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What is this code an example of?

let val = (Double)6

• an error 
• typecasting
• assignment
• initialization

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What is the error in this code?       

let x = 5

 guard x == 5 { return } 

• The guard is missing a "then".
• Nothing is wrong.
• The guard is missing an "else".
• The comparison is wrong.

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What is the raw/underlying type of this enum?

enum Direction {

  case north, south, east, west

 }

• String
• Any
• There is none.
• Int

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Why is dispatchGroup used in certain situations?

• It allows multiple synchronous or asynchronous operations to run on different queues.
• It allows track and control execution of multiple operations together.
• It allows operations to wait for each other as defined.
• all of these answers

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What is this code an example of?

let val = 5

 print ("value is: \(val)")

• string concatenation
• string compilation
• method chaining

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