# 1. Reverse the string

reverse = hex.reverse

# 2. Get every 2 characters from the string in to an array.

bytes = reverse.scan(/../)

# 3. Run through each element of the array and reverse it. (map is like each but actually returns the work)

reverse_bytes = bytes.map {|byte| byte.reverse}

# 4. Join the array in to a string.

result = reverse_bytes.join('')

return result