to-leet-speak.swift

func toLeetSpeak(_ s : String) -> String {
  
  let leetSpeak : [Character : Character] = [
    "A" : "@",
    "B" : "8",
    "C" : "(",
    "D" : "D",
    "E" : "3",
    "F" : "F",
    "G" : "6",
    "H" : "#",
    "I" : "!",
    "J" : "J",
    "K" : "K",
    "L" : "1",
    "M" : "M",
    "N" : "N",
    "O" : "0",
    "P" : "P",
    "Q" : "Q",
    "R" : "R",
    "S" : "$",
    "T" : "7",
    "U" : "U",
    "V" : "V",
    "W" : "W",
    "X" : "X",
    "Y" : "Y",
    "Z" : "2",
    " " : " "
  ]
  
  return String(s.characters.flatMap{ leetSpeak[$0] })
}