# 2 Use built-in conversion protocols

implicit_conversion.rb

winners = [
    'HomeStar',
    'King of town',
    'Marzipan',
    'Strongpad'
]

Place = Struct.new(:index, :name, :prize)
first = Place.new(0, 'first', 'Peasants quest game')
second = Place.new(1, 'second', 'pockemon')
third  = Place.new(2, 'third', 'ff')

[first, second, third].each do |place|
    puts "In #{place.name} place, #{winners[place.index]}"
    puts "You win: #{place.prize}"

end

implicit_conversion_2.rb

#  Place is more or less just an index with some metadata, it would be cool if we could use it as an index by itself. 
winners = [
    'HomeStar',
    'King of town',
    'Marzipan',
    'Strongpad'
]

Place = Struct.new(:index, :name, :prize) do |place|
    def to_int
        index
    end

end
first = Place.new(0, 'first', 'Peasants quest game')
second = Place.new(1, 'second', 'pockemon')
third  = Place.new(2, 'third', 'ff')

[first, second, third].each do |place|
    puts "In #{place.name} place, #{winners[place]}"
    puts "You win: #{place.prize}"

end

implicit_conversion_3.rb

class EmacsConfigFile
      def initialize
          @filename = "#{ENV['HOME']}/.vimrc"
      end
      def to_path
          @filename
      end end
emacs_config = EmacsConfigFile.new
File.open(emacs_config).lines.count