I think these methods should both do the same thing. The second works,
however in the first I get errors that string is not matched, where
hash is an instance of String not hash

def sequences
    self.alignment.split(/\n/).inject(Hash.new) do |hash, line|
      id, sequence = line.split(/\s+/,2)
      # hash.class == String
      hash[id] = sequence
    end
end

  def sequences
    hash = Hash.new
    self.alignment.split(/\n/).each do |line|
      id, sequence = line.split(/\s+/,2)
      # hash.class == Hash
      hash[id] = sequence
    end
    hash
  end