[Closed] callback to detect the change in renderer parameters?

fn rendProps = (	
 	for p in getpropnames renderers.current collect (getproperty renderers.current p)
 )
 
 fn compareProps = (	
 	local i = 1
 	for p in getpropnames renderers.current do (
 		
 		local prop = getproperty renderers.current p
 		if prop != props[i] then (			
 			format "%: %
" (p as string) prop
 			return false			
 		)		
 		i = i + 1
 	)  
 )
 
 props = rendProps()

 when parameters renderers.current change id:#ppp2 do (	
 	compareProps()
 	props = rendProps()
 	--deleteAllChangeHandlers id:#ppp2
 )

wonder if theres any easier way of getting property and value that actually changed