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Passing and returning functions

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The following function is returning another function as its result which can be later assigned to a variable and called: 

func jediTrainer () -> ((String, Int) -> String) {
  func train(name: String, times: Int) -> (String) {
    return "\(name) has been trained in the Force \(times) times"
  }
  return train
}

let train = jediTrainer()
train("Obi Wan", 3)
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Functions:
* Functions
* Basic Use
* Methods
* Functions with Parameters
* Subscripts
* Operators are Functions
* Variadic Parameters
* Throwing Errors
* Inout Parameters
* Returning Values
* Functions With Closures
* Passing and returning functions
* Function types
* Trailing Closure Syntax
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