title: Javascript memory impact of null vs undefined
body: <p>I work in an area where memory utilization is very important to us, as we don't run on your classic web browsers / hardware. </p>
  
  <p>We use null quite a lot in our application, one thing that has not been clear to me is if null takes up more space than assigning a variable to undefined. </p>
  
  <p>Do we know if one or the other is more costly on memory usage? </p>
  
  <p>Thanks for help!</p>