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delafl00r
348 Pointsdoes not work
the code runs in Xcode, but does not get accepted
/**
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(operation: (Int, Int) -> Int, a: Int, b: Int) -> (Int) {
return operation(a, b)
}
let difference = mathOperation(differenceBetweenNumbers, a: 10, b: 5)
3 Answers
Steven Deutsch
21,046 PointsHey Hermann Blum,
You don't need the external argument names a: and b: when you call your mathOperation function. It should just be called as:
func differenceBetweenNumbers(a: Int, b:Int) -> (Int) {
return a - b
}
// Enter your code below
func mathOperation(mathOp: (Int, Int) -> (Int), _ a: Int, _ b: Int) -> Int {
return mathOp(a, b)
}
// We can pass in any two integer values that we want to evaluate
let difference = mathOperation(differenceBetweenNumbers, 20, 10 )
If you want to refer to this post, I posted a more detailed response to this code challenge. Check it out!
https://teamtreehouse.com/community/stuck-on-this-swift-closures-task-with-my-higher-order-function.
Good Luck!
delafl00r
348 PointsThat is true, but it does not make
let difference = mathOperation(differenceBetweenNumbers, a: 10, b: 5)
wrong. For your information, in the first place I had the code like you suggested, the Challenge still said it was not working. So in my opinion something with this challenge environment is just broken.
Steven Deutsch
21,046 Pointsfunc mathOperation(mathOp: (Int, Int) -> (Int), _ a: Int, _ b: Int) -> Int {
return mathOp(a, b)
}
I updated my solution to include the underscores _ to omit the external parameter name.
delafl00r
348 Pointsahhh I see, OK totally forgot about this, Thanks a lot