Welcome to the Treehouse Community
Want to collaborate on code errors? Have bugs you need feedback on? Looking for an extra set of eyes on your latest project? Get support with fellow developers, designers, and programmers of all backgrounds and skill levels here with the Treehouse Community! While you're at it, check out some resources Treehouse students have shared here.
Looking to learn something new?
Treehouse offers a seven day free trial for new students. Get access to thousands of hours of content and join thousands of Treehouse students and alumni in the community today.
Start your free trial
Calvin Liem
3,599 Pointschecking int from given String
how to check an Int from given String and how to return nil from expected return Int
// Enter your code below
extension String {
func add(tambah: Int) -> Int {
if self == self.toInt() {
return self + tambah
} else { return nil }
}
}
"1".add(2)
2 Answers
Ivan Kazakov
Courses Plus Student 43,317 Pointsextension String {
func add(value: Int) -> Int? {
guard let intVal = Int(self) else {
return nil
}
return intVal + value
}
}
Calvin Liem
3,599 Pointsomg im totally forget about optional thanks