yukas

describe UserCreator do
  describe "#create_user" do
    it "creates user" do
      user_creator = UserCreator.new("ian@brown.com", "Ian", "Brown")
      user_creator.create_user

      expect(user_creator.created_user.email).to      eq("ian@brown.com")
      expect(user_creator.created_user.first_name).to eq("Ian")
      expect(user_creator.created_user.last_name).to  eq("Brown")
    end

yukas

class UserCreator
  attr_reader :email, :first_name, :last_name
  attr_reader :created_user

  def initialize(email, first_name, last_name)
    @email      = email
    @first_name = first_name
    @last_name  = last_name

    raise ArgumentError, "Missing email" if email.nil?

yukas

import UIKit

class ScanViewController: UIViewController, BarcodeCapturerDelegate {
  var barcodeCapturer: BarcodeCapturer!
  
  override func viewDidLoad() {
    super.viewDidLoad()
    
    barcodeCapturer = BarcodeCapturer(bounds: view.layer.bounds, delegate: self)
    view.layer.addSublayer(barcodeCapturer.previewLayer)

yukas

import AVFoundation
import UIKit

class ScanViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate {
  var captureSession: AVCaptureSession!
  var previewLayer: AVCaptureVideoPreviewLayer!
  
  var previousScannedValue: String?
  
  override func viewDidLoad() {

yukas

import AVFoundation
import UIKit

class ScanViewController: UIViewController, AVCaptureMetadataOutputObjectsDelegate {
  var captureSession: AVCaptureSession!
  var previewLayer: AVCaptureVideoPreviewLayer!
  
  var previousScannedValue: String?
  
  override func viewDidLoad() {

yukas

import AVFoundation

class BarcodeCapturer: NSObject, AVCaptureMetadataOutputObjectsDelegate {
  var bounds: CGRect
  var delegate: BarcodeCapturerDelegate
  
  var previewLayer: AVCaptureVideoPreviewLayer!

  private var captureSession: AVCaptureSession!
  private var previousScannedValue: String?

yukas

class OrderCanceller
  attr_reader :order

  def initialize(order)
    @order = order
  end
  
  def cancel_order
    change_status
    log_cancellation

yukas

class OrderCanceller
  attr_reader :order

  def initialize(order)
    @order = order
  end

  def send_notification
    OrderMailer.cancel_emal(order).deliver
  end

yukas

# order.rb
class Order < ActiveRecord::Base
  delegate :email, to: :real_user, prefix: :user
  
  belogns_to :user
  
  def real_user
    user || AnonymousUser.new
  end
end

yukas

class ReportsController < ApplicationController
  def index
    raise "Can't operate without event date" if params[:event_date_id].blank?
    
    # ...
  end
end