Sihui

class GroupContact
  attr_reader :group
  def initialize(people_in_group)
    @group = people_in_group
  end
  
  def message(text)
    group.each do |person|
      person.message(text)
    end

Sihui

class PersonContact
  attr_reader :title, :number
  
  def initialize(title, number)
    @title = title
    @number = number
  end
  
  def message(text)
    puts "Messaging #{title}(#{number}): "

Sihui

class HashIterator
  attr_reader :collection, :keys
  attr_accessor :current_index
  
  def initialize(collection)
    @collection = collection
    @keys = collection.keys
    @current_index = 0
  end
  

Sihui

class ArrayIterator
  attr_reader :collection
  attr_accessor :current_index
  
  def initialize(collection)
    @collection = collection
    @current_index = 0
  end
  
  def has_next?

Sihui

class MovieCollection
  attr_reader :movie_iterators
  attr_accessor :all_movies
  
  def initialize(movie_iterators)
    @movie_iterators = movie_iterators
    @all_movies = get_all_movies
  end

  private

Sihui

def get_all_movies
  movies = []
  movie_iterators = [
    netflix_movie_iterator, 
    amazon_movie_iterator, 
    hulu_movie_iterator, 
    youtube_movie_iterator, 
    hbo_movie_iterator
  ]
  

Sihui

def get_all_movies
  movies = []

  while netflix_movie_iterator.has_next?
    movies << netflix_movie_iterator.next
  end
  
  while amazon_movie_iterator.has_next?
    movies << amazon_movie_iterator.next
  end

Sihui

class MovieCollection
  attr_reader :netflix_movies, :amazon_movies, 
              :hulu_movies, :youtube_movies, :hbo_movies
  
  attr_accessor :all_movies
  
  def initialize(netflix_movies, amazon_movies, 
          hulu_movies, youtube_movies, hbo_movies)
    
    @netflix_movies = netflix_movies

Sihui

class MovieCollection
  attr_reader :netflix_movies, :amazon_movies
  
  def initialize(netflix_movies, amazon_movies)
    @netflix_movies = netflix_movies
    @amazon_movies = amazon_movies
    @all_movies = get_all_movies
  end
  
  private

Sihui

amazon_movies = {
  0 => {
    title: 'Mission: Impossible - Rogue Nation',
    year: '2015',
    director: 'Christopher McQuarrie',
    genre: 'Thriller/Actio',
    length: '2h 11m'
  },
  1 => {
    title: 'The Hunger Games: Mockingja',