Pastable version of Morse Code Encoder/Decoder

<pre class='prettyprint' language='ruby'>$LETTER = Hash[*%w/
A .- N -.
B -... O ---
C -.-. P .--.
D -.. Q --.-
E . R .-.
F ..-. S ...
G --. T -
H .... U ..-
I .. V ...-
J .--- W .--
K -.- X -..-
L .-.. Y -.--
M -- Z --..
/]

$CODE = $LETTER.invert

def encode(message)
  encoded_message = []
  words = message.split(&quot; &quot;)
  words.each do |word|
    encoded_word = &quot;&quot;
    word.split(//).each do |letter|
      if $LETTER.has_key?(letter.upcase)
        encoded_word &lt;&lt; $LETTER[letter.upcase]
        encoded_word &lt;&lt; &quot; &quot;
      end
    end
    encoded_message &lt;&lt; encoded_word 
  end
  puts encoded_message.join(&quot;| &quot;)
end

def decode(message)
  decoded_message = &quot;&quot;
  words = message.split(&quot;|&quot;)
  words.each do |word|
    word.split(/\s/).each do |letter|
      if $CODE.has_key?(letter)
        decoded_message &lt;&lt; $CODE[letter]
      end
    end
    decoded_message &lt;&lt; &quot; &quot;
  end
  puts decoded_message
end

def encode_file(f)
  File.open(f).each do |line|
    encode(line)
  end
end

def decode_file(f)
  File.open(f).each do |line|
    decode(line)
  end
end</pre>
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Pastable version of Morse Code Encoder/Decoder