group cipher

gistfile1.rb

def north_korean_cipher(coded_sentence) 
  input = coded_sentence.downcase.split("") # takes the input and splits each letter into its own string. Check out this method in IRB to see how it works! Also refer to the ruby docs.
  decoded_sentence = [] #blank array 
  cipher = {"e" => "a",   # This is technically a shift of four letters...Can you think of a way to automate this? Is a hash
            "f" => "b",   # the best data structure for this problem? What are the pros and cons of hashes?
            "g" => "c", 
            "h" => "d", 
            "i" => "e", 
            "j" => "f",
            "k" => "g",
            "l" => "h",
            "m" => "i",
            "n" => "j",
            "o" => "k",
            "p" => "l",
            "q" => "m",
            "r" => "n",
            "s" => "o",
            "t" => "p",
            "u" => "q",
            "v" => "r",
            "w" => "s",
            "x" => "t",
            "y" => "u",
            "z" => "v",
            "a" => "w",
            "b" => "x",
            "c" => "y",
            "d" => "z",
            "@" => " ",
            "#" => " ",
            "$" => " ",
            "%" => " ",
            "&" => " ",
            "^" => " ",
            "*" => " "}


            
  input.each do |x| # iterating through each character of the coded mesage. What is #each doing here?
    found_match = false  # if statement outside of cipher key wont run. Why would this be assigned to false from the outset? What happens when it's true?
    cipher.each_key do |y| # looks at each key and compares to value. What is #each_key doing here?
      if x == y # What is this comparing? Where is it getting x? Where is it getting y? What are those variables really?
        decoded_sentence << cipher[y]
        found_match = true
      end 
    end
    if !found_match  # This is looking for leftovers. Which happen to  be ints within string. What is this looking for?
      decoded_sentence << x
    end
  end

  decoded_sentence = decoded_sentence.join("").capitalize #takes the array of single character strings and puts them together.
  decoded_sentence.gsub!(/\d+/) { |num| num.to_i / 100 } #He's been known to exaggerate...
  decoded_sentence # This returns the final decoded sentence. What is this returning? 

end



# Driver Code:
p north_korean_cipher("m^aerx%e&gsoi!") == "I want a coke!" #This is driver code and should print true
p north_korean_cipher("syv@tistpi$iex#xli*qswx*hipmgmsyw*erh*ryxvmxmsyw%jsshw^jvsq^syv#1000000#tvsjmxefpi$jevqw.") == "Our people eat the most delicious and nutritious foods from our 10000 profitable farms."
p north_korean_cipher("syv%ryoiw#evi#liph^xskixliv@fc^kveti-jpezsvih@xsjjii.*hsr'x%xipp&xli#yw!") == "Our nukes are held together by grape-flavored toffee. don't tell the us!"
p north_korean_cipher("mj^csy&qeoi^sri*qmwxeoi,%kir.*vm@csrk-kmp,&csy^ampp*fi&vitpegih*fc@hirrmw&vshqer.") == "If you make one mistake, gen. ri yong-gil, you will be replaced by dennis rodman."
p north_korean_cipher("ribx^wxst:$wsyxl%osvie,$xlir$neter,#xlir%xli%asvph!") == "Next stop: south korea, then japan, then the world!"
p north_korean_cipher("ger^wsqifshc*nywx^kix^qi&10000*fekw@sj$gssp%vergl@hsvmxsw?") == "Can somebody just get me 100 bags of cool ranch doritos?"
# Find out what Kim Jong Un is saying below and turn it into driver code as well. Driver Code statements should always return "true"
p north_korean_cipher("syv@tistpi$iex#xli*qswx*hipmgmsyw*erh*ryxvmxmsyw%jsshw^jvsq^syv#1000000#tvsjmxefpi$jevqw.")
p north_korean_cipher("syv%ryoiw#evi#liph^xskixliv@fc^kveti-jpezsvih@xsjjii.*hsr'x%xipp&xli#yw!")
p north_korean_cipher("mj^csy&qeoi^sri*qmwxeoi,%kir.*vm@csrk-kmp,&csy^ampp*fi&vitpegih*fc@hirrmw&vshqer.")
p north_korean_cipher("ribx^wxst:$wsyxl%osvie,$xlir$neter,#xlir%xli%asvph!")
p north_korean_cipher("ger^wsqifshc*nywx^kix^qi&10000*fekw@sj$gssp%vergl@hsvmxsw?")