gistfile1.txt

class Complement
  VERSION = 2
  def self.of_dna(dna_pairs)
    new_array = []
    dna_hash = {'G' => 'C', 'C' => 'G', 'T' => 'A', 'A' => 'U'}
    dna_pairs.chars.each do |dna|
      if dna_hash[dna].nil?
        raise ArgumentError
      else
        new_array << dna_hash[dna]
      end
    end
   new_array.join('')
  end
  def self.of_rna(rna_pairs)
    new_array = []
    rna_hash = {'C' => 'G', 'G' => 'C', 'A' => 'T', 'U' => 'A'}
    rna_pairs.chars.each do |rna|
      if rna_hash[rna].nil?
        raise ArgumentError
      else
        new_array << rna_hash[rna]
      end
    end
   new_array.join('')
  end
end