Reverse Words with exclusion rules like anagrams and numbers - swift

Question

Need some help!
I have a model function in a simple project for reversing words.
The questions is:
First - How can I reverse my words (sentences) to make an anagram? For example, I need to shift the first character in each reversed word on two positions by forward.
Example:
Original - Hello world
Reversed with anagrams: - lloeH lrdow
Second - How can I reverse my words (sentences) without numbers inside it?
Example:
Original - Hello world 1234
Reversed without numbers - olleH dlrow 1234
How can I do it in my code?
import Foundation
class ReverseWords {
public func reverse(textField: String) -> String {
if textField.isEmpty {
return ""
}
return textField.trimmingCharacters(in: .whitespacesAndNewlines)
.components(separatedBy: " ")
.map { String ( $0.reversed() ) }
.joined(separator: " ")
}
}

Answer 1

Check this out.
func anagram(sentence: String, separator: Character = " ") -> String {
sentence
.trimmingCharacters(in: .whitespacesAndNewlines)
.split(separator: separator)
.map { $0.contains(where: { $0.isNumber }) ? String($0) : String($0).reverseAndShift() }
.joined(separator: String(separator))
}
extension String {
func reverseAndShift(by offset: Int = 2) -> String {
var reversed = Array(reversed())
if let firstElement = reversed.first, offset < reversed.count {
reversed.removeFirst()
reversed.insert(firstElement, at: offset)
}
return String(reversed)
}
}
print(anagram(sentence: "Hello world")) -> lloeH lrdow
print(anagram(sentence: "Hello world 1234")) -> lloeH lrdow 1234

Answer 2

It’s helpful to break your problem into independently testable functions.
Here are two functions you should find useful:
func shift2(_ str: String) -> String {
guard str.count > 2 else { return str }
let first = str.prefix(1)
let secondthird = str.prefix(3).suffix(2)
let end = String(str.dropFirst(3))
return secondthird + first + end
}
func reverseWord(_ str: String) -> String {
guard Set(str).intersection(Set("0123456789")).isEmpty else { return str }
return String(str.reversed())
}
Examples
print(shift2("abcde"))
print(shift2("abc"))
print(shift2("ab"))
bcade
bca
ab
print(reverseWord("Hello"))
print(reverseWord("Hello1"))
print(reverseWord("12345"))
olleH
Hello1
12345