Morse code

# title: Morse code
# source: https://rosettacode.org/wiki/Morse_code
# category: Rosetta Code
# difficulty: Easy
# summary: Encode text to Morse code using a fixed A-Z and digit lookup table.
# tags: popular, strings, encoding, lookup
# vibe: 0.2

def morse_for(char)
  if char == "A"
    ".-"
  elsif char == "B"
    "-..."
  elsif char == "C"
    "-.-."
  elsif char == "D"
    "-.."
  elsif char == "E"
    "."
  elsif char == "F"
    "..-."
  elsif char == "G"
    "--."
  elsif char == "H"
    "...."
  elsif char == "I"
    ".."
  elsif char == "J"
    ".---"
  elsif char == "K"
    "-.-"
  elsif char == "L"
    ".-.."
  elsif char == "M"
    "--"
  elsif char == "N"
    "-."
  elsif char == "O"
    "---"
  elsif char == "P"
    ".--."
  elsif char == "Q"
    "--.-"
  elsif char == "R"
    ".-."
  elsif char == "S"
    "..."
  elsif char == "T"
    "-"
  elsif char == "U"
    "..-"
  elsif char == "V"
    "...-"
  elsif char == "W"
    ".--"
  elsif char == "X"
    "-..-"
  elsif char == "Y"
    "-.--"
  elsif char == "Z"
    "--.."
  elsif char == "0"
    "-----"
  elsif char == "1"
    ".----"
  elsif char == "2"
    "..---"
  elsif char == "3"
    "...--"
  elsif char == "4"
    "....-"
  elsif char == "5"
    "....."
  elsif char == "6"
    "-...."
  elsif char == "7"
    "--..."
  elsif char == "8"
    "---.."
  elsif char == "9"
    "----."
  else
    nil
  end
end

def encode_morse(text)
  codes = []
  index = 0

  while index < text.length
    char = text.slice(index).upcase
    if char == " "
      codes = codes + ["/"]
    else
      code = morse_for(char)
      if code != nil
        codes = codes + [code]
      end
    end
    index = index + 1
  end

  codes.join(" ")
end

def run
  {
    sos: encode_morse("SOS"),
    vibe: encode_morse("VIBE 2026")
  }
end