module Werd
  module Reports
    class Basic
      include Contracts
      attr_reader :words

      Contract ArrayOf[[String, Num]] => Any
      def initialize words
        @words = words.first(30)
      end

      Contract None => String
      def to_s
        words.map do |row|
          "%4i %s" % [row.last, row.first]
        end.join("\n")
      end
    end
  end
end