Reverse words in a sentence - Swift

Question

How to perform reversing of all words in a sentence.

Example

let str = \"Hello playground\"

Result should be like \"olleH dnuorg

Answer 1

You can use String method enumerateSubstrings using .byWords options and replace the subrange of each word with the substring reversed. Note that this way the punctuation will remain in place:

---

import Foundation

Mutating approach:

var str = "Hello, playground!!!"

str.enumerateSubstrings(in: str.startIndex..., options: .byWords) { _, range, _, _ in
    str.replaceSubrange(range, with: str[range].reversed())
}
print(str)  // "olleH, dnuorgyalp!!!"

---

Non mutating:

let str = "Hello, playground!!!"
var result = ""
str.enumerateSubstrings(in: str.startIndex..., options: .byWords) { string, range, enclosingRange, _ in
    result.append(contentsOf: string!.reversed())
    result.append(contentsOf: str[range.upperBound..