Reverse string with exclusion rules

user_17293156 0
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I try to reverse sring and seems like i have some succes in this case:

let sampleSentence = "I like to learn Swift"

    func reverseWordsInSentence(sentence: String) -> String {
    var sentence = sentence
    sentence.enumerateSubstrings(in: sentence.startIndex..., options: .byWords) { _, range, _, _ in
        sentence.replaceSubrange(range, with: sentence[range].reversed())
    }
    return sentence
}

But I'm trying to go further and make sure that the reverse of the line does not affect the numbers for example:

let sampleSentence = "Test 1, I like to learn Swift 24/7"

now i have result:

print(reverseWordsInSentence(sentence: sampleSentence)) // 1tseT, I ekil ot nrael tfiwS 42/7

my goal is to achieve results:

print(reverseWordsInSentence(sentence: sampleSentence)) // tseT1, I ekil ot nrael tfiwS 24/7

I will be glad to any hints!

reverse swift string
1 Answers

You can add a check inside the closure and just return if the substring contains all numbers

guard let string = string, !string.allSatisfy(\.isNumber) else  {
    return
}

Full code

func reverseWordsInSentence(sentence: String) -> String {
   var sentence = sentence
   sentence.enumerateSubstrings(in: sentence.startIndex..., options: .byWords) { string, range, _, _ in

       guard let string = string, !string.allSatisfy(\.isNumber) else  {
           return
       }
       sentence.replaceSubrange(range, with: sentence[range].reversed())
   }
   return sentence
}
user_92238390
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