JavaScript Objects

<!DOCTYPE html>
<html>
<head>
   <meta charset="UTF-8">
</head>
<body>
<h2>JavaScript Objects</h2>
<script>
let plane =new Object();
plane['datecreated']   = '12-12-1980';
/*  Use key with string and spaces*/
document.write(plane['datecreated'] + "<br>");
</script>
</body>
</html>