Intercal Decoder

intercal_decode.rb

arr = [238,140,120,0,112,154,194,172,72,32,24,240,160,232,26,52]
def decode(pos = 0, array)
  array.map { |x|
    pos = (256 + pos - x) % 256
    pos.to_s(2)
       .rjust(8, '0')
       .reverse
       .to_i(2)
       .chr
  }.join
end

puts decode(arr)

# Happy Birthday!