trodrigu · September 10, 2015 16:49 · Sep 10, 2015
diff --git a/213.rb b/213.rb
@@ -0,0 +1,52 @@
+class Rule90
+  def initialize input
+    @input = input.split(//).map(&:to_i)
+  end
+
+  def get_next target_index, input
+    input[target_index + 1]
+  end
+
+  def get_prev target_index, input
+    input[target_index - 1]
+  end
+
+  def evolve input
+    input.map.with_index do |item, target_index|
+      if target_index == 0
+        prev_val = 0
+        next_val = get_next target_index, input
+      elsif target_index == input.length - 1
+        next_val = 0
+        prev_val = get_prev target_index, input
+      else
+        next_val = get_next target_index, input
+        prev_val = get_prev target_index, input
+      end
+      prev_val == next_val ? 0 : 1
+    end
+  end
+
+  def draw_x arr
+    row = arr.map do |item|
+      if item == 0
+        " "
+      else
+        "x"
+      end
+    end
+    puts row.join("")
+  end
+
+  def iterate_and_draw 
+    input = @input
+    draw_x input 
+    24.times do
+      input = evolve input
+      draw_x input
+    end
+  end
+end
+
+r90 = Rule90.new("00000000000000000000000000000000000000000000000001000000000000000000000000000000000000000000000000")
+r90.iterate_and_draw