From: Trans <transfire@...>
Date: 2008-10-26T08:47:39+09:00
Subject: Re: Hash Lookup Problem



On Oct 25, 5:58 pm, Paul <pedra...@gmail.com> wrote:
> I am writing a blackjack simulator.  I have classes like Dealer,
> Player, Deck, and Play_Strategy.  Play_Strategy describes the strategy
> a player will use.
> The strategy basically says what a player should do (hit, stand, etc)
> depending on the cards they are dealt and the dealer's upcard.
>
> I created a new object for a basic strategy
> (basic.Play_Strategy.new).  Then I have a series of hashes that I have
> set as instance variables instantiated as new hashes (ex. @lookuptable
> = Hash.new).
>
> The idea is that player1 (player1 = Player.new) will look up their
> hand as the key in the basic.action hash.  Then it will lookup the
> correct action in another hash based on the dealer.upcard.
>
> Here is the structure of the hashes.
>
> basic.lookup5 = {2 => "Hit",3 => "Hit",4 => "Hit",5 => "Hit",6 =>
> "Hit",7 => "Hit",8 => "Hit",9 => "Hit","T" => "Hit","A" => "Hit"}
> ...(removed the full list of arrays to shorten the post)...
> basic.lookupAA = {2 => "Split",3 => "Split",4 => "Split",5 => "Split",
> 6 => "Split",7 => "Split",8 => "Split",9 => "Split","T" => "Split","A"
> => "Split"}
>
> basic.action = {5 => basic.lookup5[dealer.upcard],6 =>
> basic.lookup6[dealer.upcard],7 => basic.lookup7[dealer.upcard],8=>
> basic.lookup8[dealer.upcard],
>  9=> basic.lookup9[dealer.upcard],10=> basic.lookup10[dealer.upcard],
> 11 => basic.lookup11[dealer.upcard],12=>
> basic.lookup12[dealer.upcard],
>  13 => basic.lookup13[dealer.upcard],14=>
> basic.lookup14[dealer.upcard],15 => basic.lookup15[dealer.upcard],16
> => basic.lookup16[dealer.upcard],
>  17 => basic.lookup17[dealer.upcard], 18 =>
> basic.lookup18[dealer.upcard], 19 => basic.lookup19[dealer.upcard], 20
> => basic.lookup20[dealer.upcard],
>  21 => basic.lookup21[dealer.upcard],"A2" =>
> basic.lookupA2[dealer.upcard],"A3" =>
> basic.lookupA3[dealer.upcard],"A4" => basic.lookupA4[dealer.upcard],
>  "A5"=> basic.lookupA5[dealer.upcard], "A6"=>
> basic.lookupA6[dealer.upcard],"A7"=>
> basic.lookupA7[dealer.upcard],"A8" => basic.lookupA8[dealer.upcard],
>  "A9"=> basic.lookupA9[dealer.upcard], "22" =>
> basic.lookup22[dealer.upcard],"33"=>
> basic.lookup33[dealer.upcard],"44" => basic.lookup44[dealer.upcard],
>  "55" => basic.lookup55[dealer.upcard], "66" =>
> basic.lookup66[dealer.upcard],"77" =>
> basic.lookup77[dealer.upcard],"88" => basic.lookup88[dealer.upcard],
>  "99" => basic.lookup99[dealer.upcard], "TT"=>
> basic.lookupTT[dealer.upcard], "AA"=> basic.lookupAA[dealer.upcard]}
>
> Here is what I get...
> puts "Player should #{basic.action[player1.hand.cards]}." #This is the
> problem!  It is as if player.1.hand.cards is an empty array.  I get
> "nil".
>
> I ran some basic testing by seeing if other variables work, and they
> do as follows:
>
> puts player1.hand.inspect # returns an array of two cards.  As
> expected.

If player1.hand is an array, why do you think player1.hand.cards will
return anything at all?

t