From ee889e6b55c7c6bed6d67bd037b9ec86dc082051 Mon Sep 17 00:00:00 2001
From: Lisa Hamm <lisalhamm@gmail.com>
Date: Mon, 23 Mar 2015 09:44:55 -0500
Subject: [PATCH] Changed BOARD_SIZE from a global constant to a constant
 within the Board class. Added #valid_cell_number? to check if a number falls
 in the board's cell range

---
 lib/tic_tac_toe/board.rb | 7 ++++++-
 1 file changed, 6 insertions(+), 1 deletion(-)

diff --git a/lib/tic_tac_toe/board.rb b/lib/tic_tac_toe/board.rb
index 3899473..37b9b0e 100644
--- a/lib/tic_tac_toe/board.rb
+++ b/lib/tic_tac_toe/board.rb
@@ -1,9 +1,10 @@
 module TicTacToe
-  BOARD_SIZE = 3
 
   class Board
     attr_accessor :cells, :size
 
+    BOARD_SIZE = 3
+
     def initialize(options={})
       options = defaults.merge(options)
       @size = options[:size]
@@ -22,6 +23,10 @@ def remove_mark(cell_number)
       cells[cell_number].symbol = nil
     end
 
+    def valid_cell_number?(cell_number)
+      (0..(size ** 2 - 1)).include?(cell_number)
+    end
+
     def empty_cell?(cell_number)
       cells[cell_number].symbol == nil
     end