conway's game of life

life.rb

# conway's game of life

col = 50
row = 50

# set this up however you want, i like randomness.
env = col.times.map { row.times.map { 0 == rand(2) } }

loop do
  puts "-" * col
  puts env.transpose.map { |c| c.map { |i| i ? "X" : " " }.join }.join "\n"

  nxt = col.times.map { row.times.map { false } }

  col.times do |x|
    row.times do |y|
      c = 0
      (-1 .. 1).each do |a|
        (-1 .. 1).each do |b|
          c += 1 if not (a == 0 and b == 0) and env[(x + a) % col][(y + b) % row]
        end
      end

      if (env[x][y] and (c == 2 or c == 3)) or (not env[x][y] and c == 3)
        nxt[x][y] = true
      else
        nxt[x][y] = false
      end
    end
  end

  env = nxt

  sleep 0.1
end