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iOS Swift Closures Functions as First Class Citizens Higher Order Functions

Yoram Barzilai
Yoram Barzilai
4,357 Points
Posted by Yoram Barzilai
Yoram Barzilai
4,357 Points

swift closures

I can't understand what do you mean by function as a parameter and how to define a math operation as a parameter

higherOrderFunctions.swift 
/** 
  For this code challenge, let’s define a math operation as a function that 
  carries out some work on two integers and returns an integer as well. An 
  example is the function below, `differenceBetweenNumbers`, which takes two 
  integers and calculates the difference between the numbers. After calculating, 
  it returns the difference.
*/

func differenceBetweenNumbers(a: Int, b:Int) -> (Int) {
  return a - b
}

// Enter your code below

func mathOperation(a: (a: Int, b:Int), b: Int ) -> Int {

}