JdJ3c0Cc

1import Foundation
2
3let sampleInputs = [
4    "OAuth Token",
5    "Hello-World!",
6]
7
8extension String {
9    func capitalized() -> String {
10        guard let firstCharacter = self.characters.first else { return "" }
11        return self.replacingCharacters(in: (self.startIndex)...(self.startIndex), with: String(firstCharacter).uppercased())
12    }
13}
14
15func fix(_ input: String) -> String {
16    let words = input.split(whereSeparator: { character in
17        return character == " " || character == "-"
18    })
19    var shouldCapitalizeNextWord: Bool = false
20    let output = words.reduce("") { (output, word) -> String in
21        let fixedWord = word.lowercased().trimmingCharacters(in: .punctuationCharacters)
22        if shouldCapitalizeNextWord {
23            return output.appending(fixedWord.capitalized())
24        } else {
25            shouldCapitalizeNextWord = true
26            return output.appending(fixedWord)
27        }
28    }
29    return output
30}
31
32let fixed = sampleInputs.map { fix($0) }
33// [ "oauthToken", "helloWorld"]