Position change detection

Unity Engine
,
1

How to make script that detect if there any change in position of player or entity ?

2

How about checking if the position has changed?

Vector3 lastPos = Vector3.zero;
bool hasChanged;
float delta = 0.1f;
bool CheckIfChanged ()
{
   if (Vector3.Distance(player.transform.position, lastPos) > delta){
      hasChanged = true;
     lastPos = player.transform.position;
   }
   else
   {
      hasChanged = false;
   }
   return hasChanged;
}
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