From: James Edward Gray II <james@...>
Date: 2005-10-12T05:46:21+09:00
Subject: Re: Learning ruby by make a simple game...

On Oct 11, 2005, at 3:27 PM, Robert Boone wrote:

> Hello,
>     I'm trying to learn ruby so I am making a tic tac toe game. It is
> based
> on the example the pugs example directory. I'm looking for advice  
> on how
> to
> make the script more ruby like.

Well, let's have a peek:

> #!/usr/bin/ruby
>
> # Add the ability to more than one object
> # out of a collection
> class Array
>   def pick(num)
>      (0...self.length).step(num) do
>        |i| yield self[i...i+num]
>      end
>   end
> end

Clever, I like that.

> # Print Tic Tac Toe board
> def print_board(b)
>   puts "+---+---+---+"
>   b.pick(3) do |x,y,z|
>     puts "| #{x} | #{y} | #{z} |"
>     puts "+---+---+---+"
>   end
> end

Looks good here.

> # Test if there is a winner on the board
> def winner?(game_board)
>   winning_set = [[ 0, 1, 2 ],[ 3, 4, 5 ],[ 6, 7, 8 ],[ 0, 3, 6 ],
>                  [ 1, 4, 7 ],[ 2, 5, 8 ],[ 0, 4, 8 ],[ 2, 4, 6 ]]
>   winning_set.each do |x|
>     test_set = game_board.values_at(x[0],x[1],x[2])
>     raise "has won!" if (test_set == %w{X X X} || test_set == %w{O  
> O O})
>   end
> end

WINS = [[ 0, 1, 2 ],[ 3, 4, 5 ],[ 6, 7, 8 ],[ 0, 3, 6 ],
         [ 1, 4, 7 ],[ 2, 5, 8 ],[ 0, 4, 8 ],[ 2, 4, 6 ]]

def winner?( game_board )
   WINS.any? do |win|
     game_board.values_at(*win).join =~ /^([XO])\1\1$/ ? $1 : nil
   end
end

> # Build game board and fill it with .
> board = []
> 9.times do |x|
>   board << '.'
> end

board = Array.new(0) { "." }

> player = 'X'
> choice = ''
> used   = []
>
> print_board board
>
> puts "Pick a number 1-9."
> while board.any? {|square| square == '.' }
>   print "#{player}'s turn> "
>   choice = gets.chomp
>
>   exit if choice =~ /[Qq](?:uit)?/

choice = choice.to_i # might as well just convert it once

>   if used.any? {|number| number == choice.to_i}

if used.include? choice

>     puts "Number #{choice} has been used!"
>     next
>   elsif not (1..9).include?(choice.to_i)
>     puts "Out of range."
>     next
>   end
>
>   used << choice.to_i
>
>   board[choice.to_i-1] = player
>   print_board board
>
>   begin
>     winner?(board)
>   rescue => e
>     puts "#{player} #{e}"
>     exit
>   end

if winner = winner?
   puts "#{winner} has won!"
end

>   player = (player == 'X') ? 'O': 'X'
> end
>
> puts "Cat won the game."

Well, those are my ideas.  Hope they help.

James Edward Gray II