Please Forward: Ruby Quiz Submission

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From: Nathan Morse <nathan@nathanmorse.com>
Date: November 20, 2005 5:03:27 PM CST
To: submission@rubyquiz.com
Subject: Please Forward: Ruby Quiz Submission

Ruby Quiz: Euchre Hands (#55) [SOLUTION]

Hi James,

This is my first shot at solving the Ruby Quiz and I found it quite entertaining. Please forward my solution to the Ruby Talk mailing list as I am having trouble subscribing myself.

Thanks!

-Nathan

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#!/usr/local/bin/ruby

class EuchreHand
   attr_reader :trump, :cards
   def initialize(trump, *cards)
       @trump = trump
       @cards = cards.inject() do |result, card|
           card = Card.new(trump, card)
           result.push(card)
       end
   end

end

class Card
   include Comparable
   attr_reader :trump, :card
    @@sort_order_lookup = nil
    def initialize(trump, card)
       initialize_sort_order_lookup
       @trump, @card = trump, card
   end
    def initialize_sort_order_lookup
       if (@@sort_order_lookup.nil?)
           @@sort_order_lookup = {}
           suits = %w[h c d s]
                    # build the lookup hash that will store the sort order for all possible trumps
           %w[Hearts Clubs Diamonds Spades].each do |suit_name|

               #counter maintains the sort order of each card for the current trump
               counter = 0
               @@sort_order_lookup[suit_name] = {}
               faces = %w[9 T J Q K A]
                            # index each 'regular' card
               3.downto(0) do |suit_index|
                   faces.each do |face|
                       @@sort_order_lookup[suit_name]["#{face}#{suits[suit_index]}"] = counter
                       counter += 1
                   end
               end
                            # reindex the left bower
               @@sort_order_lookup[suit_name]["J#{suits[2]}"] = counter
               counter += 1
                            # reindex the right bower
               @@sort_order_lookup[suit_name]["J#{suits[0]}"] = counter
                            #shift the array of suits by 1
               suits = suits[1..3].push(suits[0])
                            end
       end
   end

   def <=>(other)
       @@sort_order_lookup[self.trump][self.card] <=>
       @@sort_order_lookup[other.trump][other.card]
   end

   def to_s
       @card
   end

end

# parse the input
$input = (1..6).inject() { |result, line| result.push(STDIN.readline.chomp) }
$euchre_hand = EuchreHand.new(*$input)

# display our result
puts $euchre_hand.trump
$euchre_hand.cards.sort.reverse.each { |card| puts card }

ยทยทยท

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