1 files changed, 75 insertions, 0 deletions
diff --git a/board.rb b/board.rb
new file mode 100644
index 0000000..4bef0d3
--- /dev/null
+++ b/board.rb
@@ -0,0 +1,75 @@
+class Board
+  attr_accessor :current_player
+  
+  def initialize
+    @board = [
+      ['.', '.', '.'],
+      ['.', '.', '.'],
+      ['.', '.', '.']
+    ]
+  end
+  
+  def render
+    output = ''
+    @board.each {|row| output << row.join + "\n" }
+    output
+  end
+  
+  # Raises an ArgumentError if integer conversion fails
+  def transform_coordinates(str)
+    coordinates = str.split(',')
+    
+    begin
+      coordinates[0] = Integer(coordinates[0])
+      coordinates[1] = Integer(coordinates[1])
+      
+      coordinates if coordinates.length > 1
+    rescue
+    end
+  end
+  
+  def update_cell(row_index, column_index, value)
+    @board[row_index][column_index] = value
+  end
+  
+  def winner?
+    initial = '.'
+    
+    # Check horizontal
+    @board.each do |row|
+      return row[0] if array_items_equal(row) and row[0] != initial
+    end
+    
+    # Check vertical
+    @board.transpose.each do |column|
+      return column[0] if array_items_equal(column) and column[0] != initial
+    end
+    
+    # Check diagonals
+    descending = [
+      @board[0][0],
+      @board[1][1],
+      @board[2][2]
+    ]
+    if array_items_equal(descending) and descending[0] != initial
+      return descending[0]
+    end
+    
+    ascending = [
+      @board[2][0],
+      @board[1][1],
+      @board[0][2]
+    ]
+    if array_items_equal(ascending) and ascending[0] != initial
+      return ascending[0]
+    end
+    
+    nil
+  end
+  
+  private
+  
+    def array_items_equal(arr)
+      arr.uniq.length == 1
+    end
+end