## mark a section (Learn more)

Shoes.app :width => 100, :height => 100 do def self.toggle_rectangle_color @is_blue = !@is_blue color = @is_blue ? blue : red clear do fill color rect 0, 0, 100, 100 end end flow :width => 100, :height => 100 do every(0.02) do toggle_rectangle_color end end end

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