Евгени обнови решението на 16.12.2011 01:31 (преди около 13 години)
▸ Покажи разликите+module GameOfLife
+ class Board
+ include Enumerable
+ def initialize(*living_cells)
+ @alive = living_cells
+ end
+
+ def each
+ @alive.each { |cell| yield cell }
+ end
+
+ def [](x, y)
+ @alive.include? [x,y]
+ end
+
+ def next_generation
+ next_living = remain_alive + newborn
+ Board.new *next_living.uniq
+ end
+
+ def remain_alive
+ @alive.select do |cell|
+ neighbours = living_neighbours_count(cell)
+ 2 <= neighbours and neighbours <= 3
+ end
+ end
+
+ def newborn
+ @alive.inject([]) { |potential, cell| potential + Board.neighbours(cell) }
+ .select { |cell| living_neighbours_count(cell) == 3}
+ end
+
+ def living_neighbours_count(cell)
+ Board.neighbours(cell).select { |cell| self[*cell] }.count
+ end
+
+ def self.neighbours(cell)
+ x, y = cell
+ [x - 1, x, x + 1].product([y - 1, y, y + 1]).reject { |cell| cell == [x, y] }
+ end
+ end
+end