HackerRank Stdin for Swift

hackerrank.swift

func readLineString() -> [String] {
  return readLine()!.characters.split(separator: " ").map{ String($0) }
}

func readLineInt() -> [Int] {
  return readLine()!.characters.split(separator: " ").map{ Int(String($0))! }
}
    
func readData() -> Data {
  return FileHandle.standardInput.availableData
}

func readString() -> String {
  return String(data: readData(), encoding: String.Encoding.utf8)!.trimmingCharacters(in: CharacterSet.whitespacesAndNewlines)
}

func readInt() -> Int {
  return Int(readString())!
}

func readArrayOfStrings() -> Array<String> {
  return readString().components(separatedBy: CharacterSet.whitespacesAndNewlines)
}

func readArrayOfInts() -> Array<Int> {
  return readArrayOfStrings().map {
    (str: String) -> Int in
    return Int(str)!
  }
}

func readArrayOfDoubles() -> Array<Double> {
  return readArrayOfStrings().map {
    (str: String) -> Double in
    return Double(str)!
  }
}