Why does an application on the corona SDK clog RAM?

Question

Corona SDK

Why does an application on the corona SDK clog RAM?
main.lua code:

function update(e)
  display.newRect(w/2, h/2, w, h):setFillColor(0,0,0,1);

  display.newText(os.date('*t').sec, w/2, h/2);
end;

Runtime:addEventListener( "enterFrame", update );

The code shows seconds, after 5 minutes of running this code, the RAM is clogged ...
How can I fix this problem, can I implement it somehow differently?

Answer 1

Corona does not work like love2d and other lower level engines.
display.newRect() is not about painting the framebuffer region with a certain color, it is about creating an object in memory that will draw itself every frame without the need for the update(enterFrame) function.
enterFrame is needed to update already created objects, and not to create new ones every frame. Therefore, the RAM is clogged.

local rect = display.newRect(w/2, h/2, w, h)
rect:setFillColor(0,0,0,1)

local label = display.newText('', w/2, h/2)
local function update(e)
  label.text = os.date('*t').sec
end

Runtime:addEventListener( "enterFrame", update );