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Chris Cynn
9,039 PointsCompleting Intermediate Swift 3 Extension Challenge
Hi,
I have the below code written and the error I am encountering states I need to add an "add" method that takes and "Int" and returns "Int?", both of which I think I have? The prompt is below:
Your task is to extend the String type and add a method that lets you add an integer value to the string. For example: "1".add(value: 2) If the operation is possible, return an integer value. If the string does not contain an integer and you cannot add to it then return nil.
Thank you.
// Enter your code below
extension String {
func add(number: Int) -> Int? {
guard let conNumber = Int(self) else {
return nil}
return conNumber + number
}
}
1 Answer
Aniruddha Shukla
2,846 PointsThe code snippet you have posted is correct. Strangely I just changed your parameter name in your add function from ' number' to 'value' and it worked.
func add(value: Int) -> Int? {
guard let stringValue = Int(self) else {
return nil
}
return stringValue + value
}
}