rot13.rb

def rot13(secret_messages)    
    alphabet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz '.split('')
    rot13 = 'NOPQRSTUVWXYZABCDEFGHIJKLMnopqrstuvwxyzabcdefghijklm '.split('')

    lookup_hash = {}
    alphabet.zip(rot13) do |key, value|
      lookup_hash[key] = value
    end

    secret_messages = ["qrygn", "zrrg ng pubpbyngr pbeare", "gra zra", "gjb onpxhc grnzf", "zvqavtug rkgenpgvba"]
    decoded_phrase = []

    secret_messages.map do |word|  
      splitted_word = word.split('')
        decoded_word = ""
        splitted_word.map do |char|
          decoded_word << lookup_hash[char] if lookup_hash.has_key? char
        end    
        decoded_phrase << decoded_word
    end
    
    decoded_phrase
end