morse_encode.rb

# Build a function morse_encode that takes in a word (no numbers or
# punctuation) and outputs the morse code for it. Put two spaces between
# words and one space between letters.
# http://www.w1wc.com/pdf_files/international_morse_code.pdf

def morse_encode(str)
  morse_codes = { a: ".-", b: "-...", c: "-.-.", d: "-..", e: ".", f: "..-.", 
                  g: "--.", h: "....", i: "..", j: ".---", k: "-.-", l: ".-..",
                  m: "--", n: "-.", o: "---", p: ".--.", q: "--.-", r: ".-.", 
                  s: "...", t: "-", u: "..-", v: "...-", w: ".--", x: "-..-", 
                  y: "-.--",  z: "--.."
                }
  morse_result = []
  str.split(" ").each do |word|
    morse_result << word.chars.map { |c| morse_codes[c.to_sym] }.join(" ")
  end
  morse_result.join("  ")
end