Morse Encoding and Decoding

morse.rb

class String
  
  #Decodes Morse String
  #A space is assumed to be represented by 2 spaces in encoded string
  def decode_morse
    result=Array.new
    self.gsub!("  "," | ")
    morse= {"|"=>" ",".-"=>"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",
            ".----"=>"1","..---"=>"2","...--"=>"3","....-"=>"4","....."=>"5","-...."=>"6","--..."=>"7","---.."=>"8","----."=>"9","-----"=>"0"}
    self.split(" ").each do |chr|
      if morse[chr]!=nil
        result<<morse[chr]
      else
        result<<chr
      end
    end
    return result.join("")
  end
  
  #Encodes a regular string
  #A space char in the regular string is represented by 2 spaces after encoding
  def encode_morse
    result=Array.new
    morse={"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"=>"--.."," "=>"|",
       "1"=>".----","2"=>"..---","3"=>"...--","4"=>"....-","5"=>".....","6"=>"-....","7"=>"--...","8"=>"---..","9"=>"----.","0"=>"-----",}
    self.split("").each do |chr|
      if morse[chr]!=nil
        result<<morse[chr]
      else
        result<<chr
      end
    end
    result.join(" ").delete("|")
  end
  
end