Converts an ASCII text into a sequence of nucleotids

text_dna.rb

#!/usr/bin/env ruby
# Don't forget to do: chmod +x ./text_dna.rb

print 'INPUT text: '

text = gets.strip
binary = text.unpack('B*')
bits = binary[0].scan(/\w/)

sequence_bits = bits.each_slice(2).map do |a, b|
  seq = a + b
  case seq
  when '00' then 'A'
  when '01' then 'C'
  when '10' then 'G'
  else 'T'
  end
end

puts "OUTPUT sequence: #{sequence_bits.join('')}"