僕も松江Ruby会議06で出された問題を(チカラ技で)解いてみた (;´Д`)

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僕も松江Ruby会議06で出された問題を解いてみた

無理矢理な回答です　(;´Д)
print_csvが特にキモい　(;´Д)

ookiri.csv

name,ruby,php,python,perl
一郎,100,40,70,80
二郎,60,90,80,10
三郎,90,60,60,60
四郎,80,70,70,80

require 'csv'

class Ookiri
  attr_reader :ookiri, :lang, :lang_array, :attendances, :attendances_num, :lang_num, :switch

  def initialize(args={})
    @ookiri = CSV.table('ookiri.csv', headers:true, converters: :numeric, header_converters: :symbol)
    @lang = args[:lang] || ""
    @lang_array = ookiri.headers[1..-1]
    @lang_num = lang_array.length.to_f
    @attendances = ookiri[:name]
    @attendances_num = attendances.length - 1
    @switch = args[:switch] || ""
  end

  def print_csv
    if switch == "average"
      puts "average"
      hash_printer(average_hash)
    end
    if switch == "score"
      puts lang
      hash_printer(make_hash)
    end
  end

  def hash_printer(hash)
    sort_hash(hash).each{|k, v|  puts "#{k}, #{v}"}
    puts "-------------------------------"
  end


  def average_hash
    Hash[attendances.zip(score_total)]
  end

  def score_total
    (0..attendances_num).to_a.map{|num| get_average(num)}
  end

  def sort_hash(hash)
    hash.sort_by{|k, v| -v}.to_h
  end

  def score_by_language(num)
    lang_array.map{|lan| ookiri[num][lan]}
  end

  def get_average(num)
    score_by_language(num).inject{|k, v| k + v} / lang_num
  end

  def make_hash
    Hash[attendances.zip(ookiri[:"#{lang}"])]
  end
end

Ookiri.new(lang: "ruby", switch: "score").print_csv
Ookiri.new(lang: "python", switch: "score").print_csv
Ookiri.new(lang: "perl", switch: "score").print_csv
Ookiri.new(lang: "php", switch: "score").print_csv

Ookiri.new(switch: "average").print_csv

列や行が追加されたり削除されても多分大丈夫｡