Swift version: 5.6
Swift’s strings are stored in a specific way that stops you from indexing into then easily. In fact, reading one letter from part-way through the string means starting at the beginning of the string and counting through letters until you find the one you want, so if you try reading all the characters in the string this way you could accidentally create extremely slow code.
However, if you only need to read one or two letters, here’s a simple extension on String
that will help:
extension String {
subscript(i: Int) -> String {
return String(self[index(startIndex, offsetBy: i)])
}
}
With that place in place, you can write myString[15]
to read the 16th letter.
SPONSORED Play is the first native iOS design tool created for designers and engineers. You can install Play for iOS and iPad today and sign up to check out the Beta of our macOS app with SwiftUI code export. We're also hiring engineers!
Sponsor Hacking with Swift and reach the world's largest Swift community!
Available from iOS 8.0
This is part of the Swift Knowledge Base, a free, searchable collection of solutions for common iOS questions.
Link copied to your pasteboard.