title: not able to dynamically access an object property using a variable
body: <p>I am trying to add find a property of an object using a variable but it is not working. When I write the object name iso of the variable, it is working, although the variable and the object name are exactly the same..</p>
  
  <pre><code>function calCulate(nrs){
  const product = {DE2599:{name:"tet", bar:2.5, price: 3.5}};
  var nr = document.getElementById(nrs).value;
  var sku = ("prod" + nr);
  var qty = ("qty" + nr);
  var pric = ("price"+nr);
  var pal = ("pallet"+nr);
  var ctry = document.getElementById('country').value;
  var x = document.getElementById(qty).value;
  var test = document.getElementById(prod).value;
  var tests = test.toString(); // way of getting the result
  var testr = tests.indexOf(" "); // way of getting the result
  var testt = tests.slice(0,testr); // way of getting the result
  var uniqueID = ctry+testt; // this value returns DE2599
  var mywindow = window.open('','PRINT','height=800,width=800');
  var ter = product.uniqueID; // I use uniqueID because it can vary 
  var tar = ter.price;
  mywindow.document.write(tar); // this is not showing any result; but if I change the uniqueID with the actualy key, ie DE2599, it is working correctly
  </code></pre>