jsuchal

class SRPViolationError < StandardError
  def initialize(klass)
    @klass = klass
  end

  def message
    "Class #{@klass} surely does something AND detects SRP violation, right? Well, your class should do only one thing! :D"
  end
end

jsuchal

{
   "indices":{
      "crowdcloud_production":{
         "index":{
            "primary_size":"22.5gb",
            "primary_size_in_bytes":24211211120,
            "size":"22.5gb",
            "size_in_bytes":24211211120
         },
         "translog":{

jsuchal

bus = On::Bus.new.
  subscribe(DonationReceipt).
  subscribe(NotifyAccountingSystem).
  subscribe(UpdatePublicStats).
  subscribe(LogInternalMetrics).
  subscribe(UpdateAnalyticsDashboard).
  subscribe(RealtimeViewerUpdate)

jsuchal

class DonationsController # < ActionController::Base
  def create
    donation_service.add_donation(current_user, params, bus.on(
      donation_created: ->(donation) { send_user_to_payment_gateway(donation) },
      donation_invalid: ->(donation) { render donation.errors, status: :bad_request }
    ))
  end

  private
  def donation_service

jsuchal

# sandi
module GildedRose
  DEFAULT_CLASS = Item
  SPECIALIZED_CLASSES = {
    'normal'                  => Normal,
    'Aged Brie'               => Brie,
    'Backstage passes to ...' => Backstage
  }

  def self.for(name, quality, days_remaining)

jsuchal

def link_to_notifiable(notifiable)
  notifiable.link_to_notifiable(self)
end

# concerns/notifiable_presenters.rb
class Answer
  def link_to_notifiable(helper)
    helper.link_to_answer, question
  end
end

jsuchal

class InviteController < ApplicationController
  # The controller's responsibility is to build an object graph
  # that will do the hard work.
  def accept
    scenario = InvitationScenario.new

    scenario.accept_invite_token_for_user(current_user, params[:token], bus.when(
      inviting_succeeded: ->(user)  { redirect_to invite.item, notice: "Welcome!" },
      inviting_failed:    ->(error) { redirect_to '/', alert: "Oopsy!"            }
    ))

jsuchal

require 'minitest/autorun'

jsuchal

require 'minitest/autorun'

ARABIC_VALUES = {
  'I' => 1, 'V' => 5, 'X' => 10, 'L' => 50, 'C' => 100, 'D' => 500, 'M' => 1000
}

def from_roman(roman)
  chars = roman.chars << 'I'
  chars.each_cons(2).inject(0) do |sum, (c1, c2)|
    sum + (ARABIC_VALUES[c1] < ARABIC_VALUES[c2] ? -ARABIC_VALUES[c1] : ARABIC_VALUES[c1])

jsuchal

class Number < Struct.new(:value)
  def print
    value
  end
end

class Binary < Struct.new(:left, :right)
end

class Plus < Binary