improve method list

blocks_test.rb

#!/usr/bin/env ruby

class Game
  attr_accessor :name, :year, :system
  attr_reader :created_at

  def initialize(name, options={})
    self.name = name
    self.year = options[:year]
    self.system = options[:system]
    @created_at = Time.now
  end

end

class Library
  attr_accessor :games

  def initialize(games)
    @games = games
  end

  def list
    if block_given? 
      games.each do |game|
        out = yield game
        puts out
      end
    else
      games.each do |game|
        puts game.name
      end
    end
  end
end


GAMES = [
  Game.new('Contra', year: 1987, system: 'NES'),
  Game.new('Civilization', year: 1991, system: 'PC'),
  Game.new('The Legend of Zelda', year: 1986, system: 'NES'),
  Game.new('Mega Man X2', year: 1995, system: 'SNES'),
  Game.new('Super Metroid', year: 1994, system: 'SNES'),
  Game.new('Sim City 2000', year: 1993, system: 'PC'),
  Game.new('Starcraft', year: 1998, system: 'PC')
]

library = Library.new(GAMES)

puts "\n\nNo Block"
library.list

puts "\n\nBlock"
library.list { |game| game.year }