Second task is not passing though the answer is correct.

Question

Enable to pass the second task in this challenge , the editor is not suggesting any error and the code is working as expected in playground. 
Please advise. below is two answers I tried.
var mathFunction: (Int, Int) -> Int = differenceBetweenNumbers
let difference = mathOperation(mathFunction,12,3)
AND
let difference = mathOperation(differenceBetweenNumbers,12,3)
``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(differenceBetweenNumbers:(Int,Int) -> (Int),a:Int,b:Int) -> (Int)
{
    return differenceBetweenNumbers(a,b)
}
var mathFunction: (Int, Int) -> Int = differenceBetweenNumbers
let difference = mathOperation(mathFunction,12,3)
```

Caleb Kleveter · Answer

Task 2:
```swift
// The type of “differenceBetweenNumbers" is (Int, Int) - > Int.
/*
- Now that we have a TYPE, we want to create a function that takes in
 this TYPE of function as an argument in its parameter. 
*/
func mathOperation(anyAddFunc: (Int, Int) -> Int, a: Int, b: Int) -> Int{
    return anyAddFunc(a,b)
```
Task 3:
swift
let difference = mathOperation(differenceBetweenNumbers, 2, 1)

This should work.

Welcome to the Treehouse Community

Looking to learn something new?

vibhukikani

vibhukikani

Second task is not passing though the answer is correct.

1 Answer

Caleb Kleveter

Caleb Kleveter