array.rb

class Array

  def to_hash
    hash = Hash.new
    for pair in self
      if ( pair.size == 2 and 
        pair[0].class == Symbol and 
        pair[1].class == Fixnum )

        hash[pair[0]] = pair[1]
      else
        raise ArgumentError.new "Incorrect array type"
      end
    end
    hash
  end

end