Decoder

decoder.rb

text = "7,3,s,1,1,2,y,4,2,r,2,4,1,o,2,3, ,1,R,1,1,1,b,5,3,c,5,4,k,2,u"

decoded = []

text.split(",").inject(0) do |sum, char|
  unless char.to_i.zero?
    sum + char.to_i
  else
    decoded[sum] = char
    sum = 0
  end
end

puts decoded.join

decoder_oo.rb

class Decoder
  def initialize(encoded)
    @encoded = encoded
    @decoded = []
  end

  attr_reader :encoded
  attr_accessor :decoded

  def decode
    encoded.split(",").inject(0) do |sum, char|
      unless char.to_i.zero?
        sum + char.to_i
      else
        decoded[sum] = char
        sum = 0
      end
    end

    decoded.join
  end
end

text = "7,3,s,1,1,2,y,4,2,r,2,4,1,o,2,3, ,1,R,1,1,1,b,5,3,c,5,4,k,2,u"
puts Decoder.new(text).decode