How to replace function Uptade

Questions & Answers
1

In my game, I have a pallets on which the character can put or take a blocks
Before character lay or take some block is called function “check_content”
(the character must know where to take or put a block).Everything works very nicely.
The problem is that the pallets on the scene can be tens or hundreds and
function “check_content” is included in the Update functions.

function Update{

 If (change) check_content();

}

  function check_content(){
   //checks the contents of the palette`
  }

Some pallets can be updated often ,other rarely and other never but
it does not matter because practically this means hundreds acting
Update functions in the scene.

Is there any technique that would replace Update functions ?

2

use boolean var to flag wich ones need update then check in check_content() function for that boolean flag, if its false then just use return.

3

Means the content changes during the playtime. Just call the check_content() only when the real change takes place with SendMessage or BroadcastMessage function; can you?