reverseString

reverseString.swift

func reverseStringRecursive(_ string: String) -> String {
    guard !string.isEmpty else { return string }
    return reverseStringRecursive(String(string.suffix(string.count - 1))) + String(string[string.index(string.startIndex, offsetBy: 0)])
}

func reverseStringIterative(_ string: String) -> String {
    var result = ""
    for i in (0..<string.count).reversed() {
        result += String(string[string.index(string.startIndex, offsetBy: i)])
    }
    return result
}