Day 6.1

day_06.rb

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+lights = Hash.new {|h,k| h[k] = false }
+
+instructions = { "turn on" => ->(_) { true },
+                 "turn off" => ->(_) { false },
+                 "toggle" => ->(light) { !light } }
+
+regex = /(turn on|turn off|toggle) (\d+),(\d+) through (\d+),(\d+)/
+DATA.read.scan(regex).each do |instruction, x1,y1, x2,y2|
+  min_x,max_x = [x1,x2].map(&:to_i).sort
+  min_y,max_y = [y1,y2].map(&:to_i).sort
+
+  instruction = instructions[instruction]
+  (min_x..max_x).each do |x|
+    (min_y..max_y).each do |y|
+      lights[[x,y]] = instruction[lights[[x,y]]]
+    end
+  end
+end
+
+puts lights.values.count {|light| light }
+
+__END__
+turn on 887,9 through 959,629
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