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iOS Intermediate Swift 2 Extensions and Protocols Extending a Native Type

Florian Groussin
Florian Groussin
4,563 Points
Posted by Florian Groussin
Florian Groussin
4,563 Points

Hi

hello this code is obviously not working could some one could tell what i'am not doing right then permit me to correct myself?

Thank you in advance have a nice day & week end.

Florian

types.swift 
extension String {

    var add: Int {
        return self + Int if {
            self = Int }
        else {
            return nil }

        }

    }
Lukas Muller
Lukas Muller
7,347 Points
Lukas Muller
Lukas Muller
7,347 Points

Could you describe what you are supposed to do?

1 Answer

Alexander Karan
PLUS
Alexander Karan
Courses Plus Student 15,220 Points
Alexander Karan
Alexander Karan
Courses Plus Student 15,220 Points

So in this challenge you need to add a function and convert the string to a int. The function need to return an optional because the string might not be a number. You can use int(self) to convert

extension String {
 func add(valueToAdd: Int) -> Int? {
  if let currentString = Int(self) {
    return currentString + valueToAdd
  } else { return nil }
}
}