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Ruby — гниль

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FILE_TYPES_EXTENSIONS.each do |t, e|
      if e.include? extension
        return t
      elsif e.any? {|_e| _e.is_a? Hash}
        if _t = e.reduce({}) { |m, x| m = m.merge(x) if x.is_a?(Hash); m }.find{|_t, _e| _e.include? extension}
          return retrieve_parent ? t : _t.first
        end
      end
    end
    nil

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course = course_id > 0 ? Course.find(course_id) : nil

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def index
  categories = params[:category_ids].present? ?
    params[:category_ids].collect {|id| Category.find id } :
      Category.all
    respond_with(:api, categories)
end

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@requests  = Request.where(instrument_id: 1).where("state_id not in (12,3,5,8,13,15,4)").where(id: current_user.arr_request_services).order(priority_id: :desc, updated_at: :desc, id: :desc) #.page(params[:page]).per_page(20)
        @requests1 = Request.where(instrument_id: 1).where(locked_by: current_user).where("state_id not in (12,3,5,8,13,15,4)").order(priority_id: :desc, updated_at: :desc, id: :desc)
        @requests2 = Request.where(instrument_id: 1).where(author_id: current_user.id).where("state_id not in (12,3,5,8,13,15,4)").order(priority_id: :desc, updated_at: :desc, id: :desc)
        @requests3 = Request.where(instrument_id: 1).where(owner_id: current_user.id).where("state_id not in (12,3,5,8,13,15,4)").order(priority_id: :desc, updated_at: :desc, id: :desc)
        @requests  = (@requests + @requests1 + @requests2 + @requests3).uniq

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class Integer
  N_BYTES = [42].pack('i').size
  N_BITS = N_BYTES * 16
  MAX = 2 ** (N_BITS - 2) - 1
  MIN = -MAX - 1
end

p Integer::MAX              #=> 4611686018427387903
p Integer::MAX.class        #=> Fixnum
p (Integer::MAX + 1).class  #=> Bignum

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class Huyomoyo

  attr_reader :hui_razmer

  def initialize(hui_razmer = 0)
    @hui_razmer = case hui_razmer
      when 0
        'Нету'
      when 1..3
        'Пиздец маленький'
      when 4..6
        'Ну... Уже лучше'
      when 7..9
        'Норма'
      when 10..12
        'Ууажюха'
      when 13..17
        'Мдаааа'
      when 18..22
        'НИХУЯСЕБЕ'
      when 23..40
        'Да ты пиздишь'
      else
        'Че??'
    end
  end

  def print_hui
    puts @hui
  end
end

if __FILE__ == $0
  9.times do |i|
    kusokgovnokoda = case i
                       when 0
                         0
                       when 1
                         1
                       when 2
                         4
                       when 3
                         7
                       when 4
                         10
                       when 5
                         13
                       when 6
                         18
                       when 7
                         23
                       when 8
                         41
                     end
    Huyomoyo.new(kusokgovnokoda).print_hui
  end
end

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def self
  self
end

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# как надо укуриться чтобы придумать такой синтаксис? вам не кажется что стрелочка немного не там?
my_sum = -> (arg1, arg2) {arg1 + arg2}

# тем более что это полный алиас
my_sum = lambda {|arg1, arg2| arg1 + arg2}
# нафига?!

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Ruby programmers are very particular about how their for-loops are written and will declare you a bad programmer for simply using this one construct wrong. 
They went so far as to break the for-each version of looping so that there are problems with using it, forcing you to conform to their culture. Heed my warning that
 you should always use .each and never for-each for fear of being forever branded bad and shunned. Yes, it is as ridiculous as it sounds.

# запишут в пидарасы
for i in (1..10)
  puts i
end

# зауважают
(1..10).each do |i|
  puts i
end