From: Robert Boone <robert@...3.com>
Date: 2005-10-12T05:27:16+09:00
Subject: Learning ruby by make a simple game...

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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.

Thanks,
Robert


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#!/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

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

# 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

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

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)?/

  if used.any? {|number| number == choice.to_i}
    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
 
  player = (player == 'X') ? 'O': 'X'
end

puts "Cat won the game."

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